Сводная информация о патентах США
(тематическая подборка из подгруппы МПК G01S13/28)
| N п/п | Номер патента | Название | Реферат | Автор(ы) | Заявитель(ли) | Приоритет | Дата выдачи | МПК | Номер заявки |
| 1 | 8018374 | Radar | A radar having a high time and high spatial resolution and being capable of performing volume scanning with an inexpensive and simple structure, while enabling reduction is size and weight. A radar (50) is provided with an antenna unit (51) including a radio wave lens antenna device, which has a spherical transmission radio wave lens (2), a spherical reception radio wave lens (3), a primary radiator (4) arranged at a focal point of the radio wave lens (2), and a primary radiator (5) arranged at a focal point of the radio wave lens (3). The primary radiators (4, 5) pivot in an elevation direction about an axis connecting center points of the radio wave lenses (2, 3) and pivot in an azimuthal direction about an axis orthogonal to the axis connecting the center points of the radio wave lenses (2, 3) | Imai Katsuyuki (Osaka, JP), Ushio Tomoo (Suita, JP) | Sumitomo Electric Industries, Ltd. (Osaka, JP) | 31.07.2007 | 13.09.2011 | G01S7/03, G01S13/95, G01S13/28, H01Q19/06, H01Q3/04, H01Q3/14, G01S7/03, G01S13/282, G01S13/426, G01S13/951, H01Q3/04, H01Q3/14, H01Q3/2664, H01Q19/062 | 12/376063 |
| 2 | 7773205 | High-resolution three-dimensional imaging radar | A three-dimensional imaging radar operating at high frequency e.g., 670 GHz, is disclosed. The active target illumination inherent in radar solves the problem of low signal power and narrow-band detection by using submillimeter heterodyne mixer receivers. A submillimeter imaging radar may use low phase-noise synthesizers and a fast chirper to generate a frequency-modulated continuous-wave (FMCW) waveform. Three-dimensional images are generated through range information derived for each pixel scanned over a target. A peak finding algorithm may be used in processing for each pixel to differentiate material layers of the target. Improved focusing is achieved through a compensation signal sampled from a point source calibration target and applied to received signals from active targets prior to FFT-based range compression to extract and display high-resolution target images. Such an imaging radar has particular application in detecting concealed weapons or contraband | Cooper Ken B. (La Canada, CA), Chattopadhyay Goutam (Pasadena, CA), Siegel Peter H. (La Canada, CA), Dengler Robert J. (Diamond Bar, CA), Schlecht Erich T. (Pasadena, CA), Mehdi Imran (South Pasadena, CA), Skalare Anders J. (Pasadena, CA) | California Institute of Technology (Pasadena, CA) | 06.06.2008 | 10.08.2010 | G01C3/08, G01S13/28, G01S13/887, G01S13/89, G01S13/34 | 12/135040 |
| 3 | 7602331 | Computationally efficient adaptive radar pulse compression system | One aspect of this disclosure relates to a method for processing a received, modulated radar pulse to resolve a radar target from noise or other targets. According to an embodiment of the method, a radar return signal is received and samples of the radar return signal are obtained. A minimum mean-square error (MMSE) pulse compression filter is determined for each successive sample. The MMSE filter is separated into a number of components using contiguous blocking, where each component includes a piecewise MMSE pulse compression filter segment. An estimate of radar range profile is obtained from an initialization stage or a previous stage. The piecewise MMSE pulse compression filter segments are applied to improve accuracy of the estimate. The estimate is repeated for two or three stages to adaptively suppress range sidelobes to a level of a noise floor. Other aspects and embodiments are provided herein | Blunt Shannon D. (Shawnee, KS), Higgins Thomas (Lawrence, KS) | University of Kansas (Lawrence, KS) | 10.08.2007 | 13.10.2009 | G01S13/28, G01S13/526, G01S7/292, G01S13/00, G01S7/00, G01S13/284 | 11/837243 |
| 4 | 7535412 | Single pulse imaging radar system and method | A single pulse imaging (SPI) radar system for creating a radar image from a plurality of Doppler phase-shifted return radar signals in a radar environment of moving targets includes a transmitter: a receiver for receiving a radar return signal: an analog-to-digital converter (ADC) coupled to the output of the receiver: a processor, coupled to the output of the ADC, that is programmed with an SPI algorithm that includes a bank of range/Doppler-dependent adaptive RMMSE-based filters: and a target detector. The algorithm estimates adaptively a range profile for each of the Doppler phase-shifted return radar signals to create the radar image of the moving targets | Blunt Shannon D (Shawnee, KS), Shackelford Aaron K (South Riding, VA), Gerlach Karl R (Chesapeake Beach, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 25.01.2007 | 19.05.2009 | G01S13/89, G01S13/00, G01S13/90, G01S13/28, G01S7/2921, G01S13/28, G01S13/582 | 11/626935 |
| 5 | 7495598 | Methods and systems for avoidance of partial pulse interference in radar | Systems and methods for avoidance of partial pulse interference in radar. The systems and methods include a radar processor for generating control signals that direct the generation and transmission of two consecutive radar pulses using a waveform and pulse train generator and transmitter. The systems and methods also include receiving reflected echoes corresponding to the transmitted pulses using a receiver and processing the echoes using an analog to digital converter, filter, and digital signal processor to separate echoes from each pulse, process them, and combine the results to avoid partial pulse interference while maintaining pulse energy and an acceptable signal to noise ratio | Holmberg Bart A. (Bellevue, WA) | Honeywell International Inc. (Morristown, NJ) | 04.04.2006 | 24.02.2009 | G01S13/95, G01S13/28, G01S7/28, G01S13/106, G01S13/30, G01S13/953 | 11/278578 |
| 6 | 7248205 | Radar apparatus | A transmitter emits into an intended search space a radar wave having a predetermined frequency pulse-modulated by a trigger pulse of a predetermined width. A receiver receives a reflected wave of the radar wave and outputs a receive signal. A local pulse generator outputs a local pulse signal having the predetermined frequency pulse-modulated by the trigger pulse delayed by the delay unit. A correlation value detector detects a strength correlation value between the receive signal and the local pulse signal. A delay time changing unit changes the delay time sequentially within a range of a predetermined period representing a generation period of the trigger pulse. A correlation value storage unit stores the strength correlation value detected for each delay time changed. A frequency distribution generator generates a frequency distribution of a stored correlation value against the delay time. A search control unit executes an analyzation for the intended search space based on a generated frequency distribution | Uchino Masaharu (Aiko-gun, JP) | Anritsu Corporation (Atsugi-shi, JP), Matsushita Electric Industrial Co., Ltd. (Kadoma-shi, JP) | 04.02.2005 | 24.07.2007 | G01S13/28, G01S13/42, G01S7/285, G01S7/2923, G01S13/0209, G01S13/103 | 10/548400 |
| 7 | 7148841 | Radar device | A radar device includes a code generator, a transmission section, a reception section, a delay section, a despreading process section, a correlation value detection section, a target detection section, an estimation section, an acquisition section, and a correction section. The estimation section estimates a reception intensity of a reflection wave from a target located at a first distance on a basis of a detected correlation value. The acquisition section acquires a cross-correlation value between the first distance and a second distance, on a basis of the estimated reception intensity of the reflection wave from the target located at the first distance, a delayed despreading code used to detect a correlation value for the first distance and a delayed despreading code used to detect a correlation value for the second distance. The correction section corrects the correlation value for the second distance on a basis of the cross-correlation value | Yoneda Kimihisa (Hyogo, JP), Hiromori Masaki (Kanagawa, JP) | Fujitsu Ten Limited (Kobe, JP), Fujitsu Limited (Kawasaki, JP) | 16.03.2005 | 12.12.2006 | G01S7/282, G01S13/28, G01S7/4021, G01S13/0209, G01S13/325 | 11/080482 |
| 8 | 7019686 | RF channel calibration for non-linear FM waveforms | A system, method, and computer program product that performs self-calibration of pulse-compression radar signals. The system includes an antenna, a receiver, a transmitter, and a radar signal processor. Under normal (non-calibration) operation the radar transmitter generates a pulse compression waveform and transmits it via the antenna. Any reflections from this waveform are detected by the same antenna and processed by the receiver. The received radar signal then undergoes pulse compression followed by more mode-specific processing (windshear, weather, ground map, etc.) by the radar processor. During calibration, the radar transmitter generates a similar pulse compression waveform (i.e., calibration pulses), but the calibration pulses bypass the antenna and go directly to the receiver via a "calibration path" built into the hardware. The resulting calibration pulses are used to generate a calibration filter. The calibration filter is applied to the received radar signals in the frequency domain either before or after pulse compression | Hester Jeffrey A. (Issaquah, WA), Gidner Dawn M. (Redmond, WA), Logan Gloria M. (Woodinville, WA) | Honeywell International Inc. (Morristown, NJ) | 27.02.2004 | 28.03.2006 | G01S7/40, G01S13/28, G01S7/4004, G01S13/28, G01S13/95 | 10/788932 |
| 9 | 6967613 | Broadband waveform reconstruction for radar | Resolution of a radar operating within a bandwidth is improved by defining a quantity of substantially rectangular sub-band filters to subdivide the bandwidth in the frequency domain into the quantity of sequential sub-bands having a sub-bandwidth. Each signal sent by the radar is associated with a transmission temporal moment. Each of the quantity of return signals received is routed in one to one correspondence to the sub-band filters, each signal being received at a corresponding sub-band filter. The return signals received are summed by synchronizing the associated transmission temporal moment to produce a reconstructed return signal | Holmberg Bart A. (Bellevue, WA), Christianson Paul E. (Seattle, WA) | Honeywell International Inc. (Morristown, NJ) | 17.03.2004 | 22.11.2005 | G01S13/26, G01S13/00, G01S13/28, G01S013/89, G01S13/26, G01S13/282 | 10/802980 |
| 10 | 6956522 | Pulse radar system | A pulse radar system has a high-frequency source, which supplies a continuous high-frequency signal and is connected on the one side to a transmission-side pulse modulator and on the other side to at least one mixer in at least one receive path. A pulse modulator is connected upstream of the mixer with regard to its connection to a receiving antenna. The mixer evaluates a radar pulse reflected by an object together with the signal of the high-frequency source. This system does not require a ZO switch and is insensitive to interference | Gottwald Frank (Weissach, DE) | Robert Bosch GmbH (Stuttgart, DE) | 06.08.2004 | 18.10.2005 | G01S7/285, G01S13/93, G01S13/00, G01S13/18, G01S13/28, G01S7/288, G01S007/28, G01S7/285, G01S13/003, G01S13/18, G01S13/284, G01S13/931, G01S2007/2886 | 10/488170 |
| 11 | 6950056 | Methods and apparatus for determination of a filter center frequency | A method for calculating a center frequency and a bandwidth for a radar doppler filter is herein described. The center frequency and bandwidth are calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll. The method includes receiving an antenna mounting angle, a slant range, and velocity vectors in body coordinates, calculating a range swath doppler velocity, a track and phase swath bandwidth, and a phase swath doppler velocity. The method continues by calculating a range swath center frequency based on the range swath doppler velocity, calculating a phase swath center frequency based on the phase swath doppler velocity, and calculating a level and verify swath bandwidth based upon the track and phase swath bandwidth | Hager James R. (Golden Valley, MN), Heidemann Thomas W. (Anoka, MN), Jicha Thomas R. (Elk River, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 27.09.2005 | G01C21/00, G01S13/00, G01S13/524, G01S7/292, G01S13/94, G01S13/70, G01S13/18, G01S13/20, G01S13/42, G01S13/28, G01S13/88, G01S3/14, G01S3/48, G01S007/40, G01C21/005, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144745 |
| 12 | 6940450 | Robust predictive deconvolution system and method | A method for processing a received, modulated pulse (i.e. waveform) that requires predictive deconvolution to resolve a scatterer from noise and other scatterers includes receiving a return signal: obtaining L+(2M-1)(N-1) samples y of the return signal, where y(l)=x.sup.T (l)s+v(l): applying RMMSE estimation to each successive N samples to obtain initial impulse response estimates [x.sub.1 {-(M-1)(N-1)}, . . . , x.sub.1 {-1}, x.sub.1 {0}, . . . , x.sub.1 {L-1}, x.sub.1 {L}, . . . , x.sub.1 {L-1+(M-1)(N-1)}]: computing power estimates .rho..sub.1 (l)=.vertline.x.sub.1 (l).vertline..sup.2 for l=-(M-1)(N-1), . . . , L-1+(M-1)(N-1): computing MMSE filters according to w(l)=.rho.(l)(C(l)+R).sup.-1 s, where .rho.(l)=.vertline.x(l).vertline..sup.2 is the power of x(l), and R=E[v(l)v.sup.H (l)] is the noise covariance matrix: applying the MMSE filters to y to obtain [x.sub.2 {-(M-2)(N-1)}, . . . , x.sub.2 {-1}, x.sub.2 {0}, . . . , x.sub.2 {L-1}, x.sub.2 {L}, . . . , x.sub.2 {L-1+(M-2)(N-1)}]: and repeating (d)-(f) for subsequent reiterative stages until a desired length-L range window is reached, thereby resolving the scatterer from noise and other scatterers. The RMMSE predictive deconvolution approach provides high-fidelity impulse response estimation. The RMMSE estimator can reiteratively estimate the MMSE filter for each specific impulse response coefficient by mitigating the interference from neighboring coefficients that is a result of the temporal (i.e. spatial) extent of the transmitted waveform. The result is a robust estimator that adaptively eliminates the spatial ambiguities that occur when a fixed receiver filter is used | Blunt Shannon D. (Alexandria, VA), Gerlach Karl R. (Chesapeake, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 30.09.2003 | 06.09.2005 | G01S13/00, G01S13/28, G01S7/292, G01S007/292, G01S007/32, G01S013/00, G01S7/2921, G01S13/284 | 10/673343 |
| 13 | 6940447 | Radar device and method for operating a radar device | A radar device having means for generating a carrier-frequency signal, means for shaping pulses, means for generating modulated radar pulses from the carrier-frequency signal, means for emitting modulated signals as radar pulses, means for receiving radar pulses and means for processing the received radar pulses. The means for receiving the radar pulses have an array including a plurality of antennas, the means for processing the radar pulses have means for dividing the signal power over at least two different reception branches. Means are provided for generating different directional characteristics in the various reception branches | Voigtlaender Klaus (Wangen, DE), Villino Guido (Leonberg, DE), Passmann Christian (Wiernsheim, DE), Meier Thomas (Berlin, DE), Schmid Dirk (Simmozheim, DE) | Robert Bosch GmbH (Stuttgart, DE) | 08.10.2003 | 06.09.2005 | G01S13/00, G01S13/28, H01Q3/26, H01Q25/00, G01S13/93, G01S13/02, G01S013/93, G01S13/284, H01Q3/26, H01Q25/002, G01S13/931, G01S2013/0272 | 10/416751 |
| 14 | 6917327 | Adding error correction and coding to a radar system | A method for transmitting a radar signal comprises the step of transmitting a series of pulses, each of the pulses being separated in time by an interpulse period, and each of the pulses in the series being modulated in accordance with a different character of a first code | Jenkins Alan (Groton, MA) | M/A Com, Inc. (Lowell, MA) | 11.03.2003 | 12.07.2005 | G01S13/26, G01S13/00, G01S7/36, G01S13/02, G01S13/28, G01S013/00, G01S013/08, G01S7/023, G01S7/36, G01S13/26, G01S13/288, G01S2013/0281 | 10/385814 |
| 15 | 6903679 | Video amplifier for a radar receiver | A video amplifier for a radar receiver includes a temperature compensating attenuator. The attenuator includes a temperature sensitive device, such as a thermistor, arranged in a voltage divider network and is coupled in cascade between two filter stages. Each of the filter stages has a and provide sensitivity control based on frequency and thus range, while also filtering high frequency signals to reduce aliasing | Hanson James T. (Maynard, MA), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Waltham, MA) | 16.08.2001 | 07.06.2005 | B60Q1/50, B60Q1/52, B60Q1/26, G01S13/93, G01S13/34, G01S13/87, G01S13/48, G01S13/00, G01S13/04, G01S13/28, G01S7/03, G01S7/02, G01S7/35, G01S7/40, G01S7/04, G01S7/26, H01Q13/10, H01Q21/06, H01Q3/24, H01Q25/00, H01Q21/00, H01Q1/32, G01S7/288, G01S7/285, G01S013/00, G01S007/00, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931593 |
| 16 | 6897804 | Methods and apparatus for determination of a filter center frequency | A method for calculating a center frequency and a bandwidth for a radar doppler filter is herein described. The center frequency and bandwidth are calculated to provide radar performance over varying terrain and aircraft altitude, pitch, and roll. The method includes receiving an antenna mounting angle, a slant range, and velocity vectors in body coordinates, calculating a range swath doppler velocity, a track and phase swath bandwidth, and a phase swath doppler velocity. The method continues by calculating a range swath center frequency based on the range swath doppler velocity, calculating a phase swath center frequency based on the phase swath doppler velocity, and calculating a level and verify swath bandwidth based upon the track and phase swath bandwidth | Hager James R. (Golden Valley, MN), Heidemann Thomas W. (Anoka, MN), Jicha Thomas R. (Elk River, MN) | Honeywell International Inc. (Morristown, NJ) | 09.09.2003 | 24.05.2005 | G01C21/00, G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/18, G01S13/20, G01S13/42, G01S13/28, G01S13/88, G01S3/14, G01S3/48, G01S013/08, G01S013/42, G01C21/005, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/657971 |
| 17 | 6894640 | Methods and apparatus for conversion of radar return data | An in-phase/quadrature component (IQ) mixer is configured to reject returns returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature component from the in-phase component of an input signal. Further included are a plurality of mixer elements, a plurality of low pass filters, a plurality of decimators, and a plurality of all pass filters which act upon both the in-phase and quadrature components of the input signal. Also, a subtraction element is included which is configured to subtract the filtered and down sampled quadrature component from the filtered and down sampled in-phase component | Hager James R. (Golden Valley, MN), Henrickson Jens M. (St. Paul, MN), Jordan Lavell (Bloomington, MN), Petrich Curtis J. (Minneapolis, MN) | Honeywell International Inc. (Morristown, NJ) | 09.09.2003 | 17.05.2005 | G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/18, G01S13/20, G01S13/42, G01S13/28, G01S13/88, G01S3/14, G01S3/48, G01S013/08, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/657883 |
| 18 | 6888492 | Radar | A radar for a terminally-guided sub-munition is capable of differentiating between spatial depositions of target scatterers and clutter. The radar frequency f is swept, in stepwise manner, over a frequency range F, the frequency of 2N successive batches of M pulses being incremented in steps of ##EQU1## To minimise variability of hybrid spectrum with relative target velocity, v, a duplexer transmits the 2 NM pulses with a monotonic frequency | Voles Roger (Chiswick, GB) | Thorn Emi Electronics Limited (Hayes, GB) | 15.01.1988 | 03.05.2005 | G01S13/00, G01S13/24, G01S13/524, G01S13/28, G01S013/00, G01S13/24, G01S13/282, G01S13/524 | 07/163567 |
| 19 | 6885334 | Methods and systems for detecting forward obstacles | Methods and apparatus for detecting obstacles in the flight path of an air vehicle are described. The air vehicle utilizes a radar altimeter incorporating a forward looking antenna and an electronic digital elevation map to provide precision terrain aided navigation. The method comprises determining a position of the air vehicle on the digital elevation map, selecting an area of the digital elevation map in the flight path of the air vehicle, based at least in part on the determined air vehicle position, and scanning the terrain representing the selected map area with the forward looking antenna. The method also comprises combining the digital elevation map data for the selected map area with radar return data for the scanned, selected area and displaying the combined data to provide a representation of the terrain and obstacles in the forward flight path of the air vehicle | Hager James R. (Golden Valley, MN), Almsted Larry D. (Bloomington, MN), Becker Robert C. (Eden Prairie, MN) | Honeywell International Inc. (Morristown, NJ) | 07.07.2004 | 26.04.2005 | G01C21/00, G01S13/94, G01S13/00, G01S13/28, G01S13/88, G01S13/42, G01S013/00, G01S13/288, G01S13/882, G01S13/94, G01S13/426 | 10/885860 |
| 20 | 6879281 | Pulse radar detection system | A radar based sensor detection system comprises a microwave source operative to provide a continuous wave signal at an output. A pulse-former is coupled to the output of the source and is operative to provide at an output a variable length pulse that increases the transmitted energy of the radar system according to the range of object detection. A modulator is coupled to the output of the pulse-former for providing a modulated pulse signal when required. A transmit/receive switch coupled to the output of the modulator is selectively operative between a first transmit position and a second receive position. A transmit channel coupled to the transmit/receive switch transmits the pulse signal when the switch is operated in the transmit position. A receiving channel coupled to the transmit/receive switch receives the modulator signal when the switch is operated in the receive position. First and second voltage multipliers each have a local oscillator input for receiving the modulator signal in the receive position, and each have an input signal port, and an output port. A receiver channel receives a reflected transmitted signal from an object and applies the received signal to the receive signal input ports of the voltage multipliers. An autocorrelator coupled to the output ports of the voltage multipliers correlates the received signal to produce an output signal indicating the detection and position of the object | Gresham Robert Ian (Somerville, MA), Egri Robert (Wayland, MA) | M/A - Com, Inc. (Lowell, MA) | 21.05.2003 | 12.04.2005 | G01S13/18, G01S13/00, G01S13/28, G01S13/10, G01S7/28, G01S7/288, G01S7/282, G01S7/285, G01S013/10, G01S7/282, G01S7/288, G01S13/106, G01S13/18, G01S13/288, G01S2007/2886 | 10/442790 |
| 21 | 6865477 | High resolution autonomous precision positioning system | A vehicle navigation method and system employing echo or doppler analysis to provide autonomous or enhanced navigational capabilities by correlating stored scene information with echo analysis information derived from an Active Traveling-Wave Device (ATWD) output representing information concerning the vehicle's state and velocity vectors with respect to a mapped scene | Nicosia Joseph M. (Carlsbad, CA), Loss Keith R. (San Diego, CA), Taylor Gordon A. (Anamosa, IA) | Winged Systems Corporation (Caldwell, TX) | 11.02.2002 | 08.03.2005 | G01C21/10, G01C23/00, F21V21/10, G01C21/16, F21S4/00, F21V21/108, G01S13/91, G01S13/90, G01S13/00, G01S13/95, G01S13/28, G01S7/02, G01S7/41, G05D1/06, G05D1/00, G08G5/02, G08G5/00, G01S13/86, G01S5/14, G01C021/00, F21S4/001, F21V21/108, G01C21/165, G01C23/005, G01S7/412, G01S13/286, G01S13/9035, G01S13/913, G01S13/953, G01S19/15, G05D1/0676, G08G5/0021, G08G5/025, F21W2121/00, G01S13/86, G01S13/90, G01S19/52 | 10/071198 |
| 22 | 6864831 | Radar detection method and apparatus | A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. In one embodiment, a zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Also described is a detection table containing indicators of the presence or absence of an object within a respective radar beam and detect the presence of an object within the detection zone | Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 26.08.2002 | 08.03.2005 | B60K31/00, B60Q1/50, B60Q1/52, B60Q1/26, G01S13/34, G01S13/87, G01S13/48, G01S13/93, G01S13/00, G01S13/04, G01S13/28, G01S7/03, G01S7/02, G01S7/35, G01S7/40, G01S7/04, G01S7/26, H01Q1/38, H01Q13/10, H01Q3/30, H03H21/00, H03H7/01, H01Q21/00, H01Q21/06, H01Q3/40, H01Q3/24, H01Q25/00, H01Q1/32, G01S13/02, G01S13/72, G01S13/58, G01S7/288, G01S7/285, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 10/229256 |
| 23 | 6859167 | Method for increasing the unambiguous distance in FSK radars | A method used to increase the ambiguity distance of FSK radars implements a waveform made up of patterns consisting of frequency plateaux whose frequencies are alternately shifted by plus or minus a value .DELTA.f'. With this waveform, the method associates processing operations to eliminate ambiguous echoes and image signals. This method has the advantage of not modifying the repetition period of the radar to which it is applied. The method according to the invention can be applied especially to radars in automobiles and especially to anti-collision radars | Artis Jean-Paul (Plouzane, FR) | Thales (Neuilly sur Seine, FR) | 09.09.2003 | 22.02.2005 | G01S13/00, G01S13/34, G01S13/93, G01S13/28, G01S007/282, G01S13/34, G01S13/286, G01S13/343, G01S13/348, G01S13/931 | 10/657708 |
| 24 | 6856279 | Methods and apparatus for determining an interferometric angle to a target in body coordinates | A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, is disclosed. The radar return data includes a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between radar return data received at a right radar channel and an ambiguous radar channel, and a phase difference between radar return data received at a right radar channel and a left radar channel. The method includes adjusting a phase bias for the three phase differences, resolving phase ambiguities between the three phase differences to provide a signal, and filtering the signal to provide a physical angle to the target in aircraft body coordinates | Hager James R. (Golden Valley, MN), Jordan Lavell (Bloomington, MN), Burlet Todd R. (Maple Grove, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 15.02.2005 | G01S13/00, G01S13/524, G01S7/292, G01S13/94, G01S13/70, G01S13/18, G01S13/20, G01S13/28, G01S13/42, G01S13/88, G01S3/14, G01S3/48, G01S013/42, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144873 |
| 25 | 6850552 | Iterative precision spectrum analysis | Simultaneous improvement in resolution, frequency range, dynamic ranges, as well as signal-to-noise ratio of spectrum analysis is possible by the huge increase in speed and capacity of digital data processing. In coherent pulse sounding (especially in monostatic Radar and Sonar), precise determination of the frequency, amplitude, and phase of wanted signals and unwanted interferers in the frequency domain and their elimination in the time domain data set leads to substantial improvement in the dynamic range of the analysis. Thus, a new apparatus and method of unevenly spaced transmitter pulses becomes feasible to increase the number of samples in a time period limited by the coherency requirements of the data set. The invented apparatus and method overcomes the inherent limitation in dynamic range of the spectral amplitudes due to cross-talk and sparse sampling. Non-linear spectrum analysis can improve signal-to noise further. Pre-cleaning of spread-spectrum data is another application of this method | Bibl Klaus (Belmont, MA), Family ID | --- | 01.12.2000 | 01.02.2005 | G01S13/00, G01S13/22, G01S13/58, G01S13/28, G01S7/292, G01S13/95, G01S013/95, G01S7/2923, G01S13/225, G01S13/288, G01S13/582, G01S13/95 | 09/728846 |
| 26 | 6839019 | Pulse radar device | A pulse radar device includes a VCO that oscillates a carrier wave that has been modulated in frequency, a switch that modulates the carrier wave generated by the VCO to a pulse wave, a transmission antenna that transmits the pulse wave that has been modulated by the switch as an electromagnetic wave, a reception antenna that receives a reflection wave obtained by reflecting the electromagnetic wave that has been transmitted by the transmission antenna by a target substance, a mixer that demodulates the reception signal that has been received by the reception antenna on the basis of the carrier wave that has been generated by the VCO, and a limiter that limits an amplitude of the demodulation signal which has been demodulated by the mixer | Noda Shinsaku (Tokyo, JP) | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) | 20.05.2003 | 04.01.2005 | G01S13/28, G01S13/00, G01S013/08, G01S013/00, G01S13/282 | 10/441053 |
| 27 | 6836240 | Waveform synthesis for imaging and ranging applications | Frequency dependent corrections are provided for Local Oscillator (LO) feed-through. An operational procedure filters LO feed-through effects without prior calibration or equalization. Waveform generation can be adjusted/corrected in a synthetic aperture radar system (SAR), where a rolling phase shift is applied to the SAR's QDWS signal where it is demodulated in a receiver, unwanted energies, such as LO feed-through energy, are separated from a desired signal in Doppler: the separated energy is filtered from the receiver leaving the desired signal: and the separated energy in the receiver is measured to determine the degree of imbalance that is represented by it. Calibration methods can also be implemented into synthesis. The degree of LO feed-through can be used to determine calibration values that can then be provided as compensation for frequency dependent errors in components, such as the QDWS and SSB mixer, affecting quadrature signal quality | Dubbert Dale F. (Cedar Crest, NM), Dudley Peter A. (Albuquerque, NM), Doerry Armin W. (Albuquerque, NM), Tise Bertice L. (Albuquerque, NM) | Sandia Corporation (Albuquerque, MN) | 13.05.2003 | 28.12.2004 | G01S13/90, G01S13/28, G01S13/00, G01S7/28, G01S7/282, G01S007/35, G01S013/90, G01S7/282, G01S13/282, G01S13/9035 | 10/437329 |
| 28 | 6833809 | Remote sensing using rayleigh signaling | This invention features an improved technique for search and track surveillance. In this invention, distinct and random (in both space and time) signal beams are simultaneous transmitted from an array of transmitter source elements in a manner to cover all sectors about a source location. In addition, countermeasures against a system according to the invention are difficult because the signal waveforms for each beam are distinct and random, making prediction of any signal waveform for any beam very unlikely. An array of receiver sensor elements is provided to receive signals that are scattered from remote objects and may or may not be co-located with and share the elements of the source array element. The scattered signals are received and processed to yield the direction and range of the remote objects | Elam Carl M. (Perry Hall, MD) | Greenwich Technologies Associates (Darien, CT) | 15.07.2003 | 21.12.2004 | G01S13/28, G01S13/00, G01S13/02, G01S013/00, G01S013/08, G01S13/003, G01S13/288, G01S2013/0281 | 10/619175 |
| 29 | 6816107 | Technique for changing a range gate and radar coverage | A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. In one embodiment, a zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Also described is a detection table containing indicators of the presence or absence of an object within a respective radar beam and detect the presence of an object within the detection zone and with changing range gates in each of the antenna beams the coverage of the detection zone can be varied | Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Waltham, MA) | 01.04.2003 | 09.11.2004 | B60K31/00, B60Q1/50, B60Q1/52, B60Q1/26, G01S13/87, G01S13/48, G01S13/93, G01S13/34, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/02, G01S7/35, G01S7/04, G01S7/26, G01S7/40, H01Q1/38, H01Q3/30, H01Q13/10, H03H21/00, H03H7/01, H01Q21/00, H01Q21/06, H01Q3/40, H01Q3/24, H01Q25/00, H01Q1/32, G01S13/02, G01S13/72, G01S13/58, G01S7/288, G01S7/285, G01S013/04, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 10/404316 |
| 30 | 6784828 | Near object detection system | A near object detection (NOD) system includes a plurality of sensors, each of the sensors for providing detection coverage in a predetermined coverage zone and each of the sensors including a transmit antenna for transmitting a first RF signal, a receive antenna for receiving a second RF signal and means for sharing information between each of the plurality of sensors in the NOD system | Delcheccolo Michael Joseph (Westford, MA), Russell Mark E. (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Pleva Joseph S. (Londonderry, NH), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 31.08.2004 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S7/02, G01S13/34, G01S13/48, G01S13/93, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/35, G01S7/04, G01S7/26, G01S7/40, H01Q1/38, H01Q3/30, H01Q13/10, H03H21/00, H03H7/01, H01Q21/00, H01Q21/06, H01Q3/40, H01Q3/24, H01Q1/32, H01Q25/00, G01S13/02, G01S13/72, G01S13/58, G01S7/288, G01S7/285, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931631 |
| 31 | 6760363 | Digital correlation device and correlation method for telemetric systems | A correlation method and a digital correlation device allowing detection of the occurrence of a coded reference sequence including N code elements or chips in a sampled reception signal are described. The reception signal is sampled at a frequency equal to d times the chip rate of the reference sequence, and d.times.Nd correlation values are generated for d.times.Nd successive delays of the reception signal, Nd being a lower number than the number N of chips. Each correlation value, for a given delay of the reception signal, is obtained, according to the present invention, at the end of a plurality of correlation operations during which partial correlation values covering code portions including Nd successive chips of the reference sequence are generated | Bettaieb Khaled (Hauterive, CH) | CSEM Centre Suisse d'Electronique et de Microtechnique SA (Neuchatel, CH) | 05.09.2000 | 06.07.2004 | G01S13/28, G01S13/00, G01S013/28, G01S013/08, G01S13/288 | 09/655715 |
| 32 | 6748312 | Safe distance algorithm for adaptive cruise control | In accordance with the present invention, an adaptive cruise control system includes a radio frequency (RF) transmit receive (TR) sensor module (or more simply "sensor") disposed such that a detection zone is deployed in front of a vehicle. The sensor includes a sensor antenna system which comprises a transmit antenna for emitting or transmitting an RF signal and a receive antenna for receiving portions of the transmitted RF signal which are intercepted by one or more objects within a field of view of the transmit antenna and reflected back toward the receive antenna. With this particular arrangement, a detection system that detects objects in a region about a front of a vehicle is provided. If the system determines that the vehicle is approaching an object or that an object is approaching the vehicle, then the sensor initiates steps that are carried out in accordance with a set of rules that control an accelerator of the vehicle. The accelerator is adjusted to maintain a safe trailing distance behind the detected object | Russell Mark E. (Westford, MA), Delcheccolo Michael Joseph (Westford, MA), Woodington Walter Gordon (Littleton, MA), Van Rees H. Barteld (Needham, MA), Firda John Michael (Andover, MA), Lippert Delbert (Cobden, CA) | Raytheon Company (Waltham, MA) | 16.08.2001 | 08.06.2004 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S7/02, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q13/10, H01Q1/38, H01Q3/30, H03H21/00, H01Q21/00, H01Q21/06, H01Q3/40, H03H7/01, H01Q3/24, H01Q1/32, H01Q25/00, G01S13/02, G01S13/58, G01S7/288, G01S7/285, B60K031/04, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931630 |
| 33 | 6734820 | Methods and apparatus for conversion of radar return data | An in-phase/quadrature component (IQ) mixer is configured to reject returns returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature component from the in-phase component of an input signal. Further included are a plurality of mixer elements, a plurality of low pass filters, a plurality of decimators, and a plurality of all pass filters which act upon both the in-phase and quadrature components of the input signal. Also, a subtraction element is included which is configured to subtract the filtered and down sampled quadrature component from the filtered and down sampled in-phase component | Hager James R. (Golden Valley, MN), Henrickson Jens M. (St. Paul, MN), Jordan Lavell (Bloomington, MN), Petrich Curtis J. (Minneapolis, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 11.05.2004 | G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/18, G01S13/20, G01S13/28, G01S13/88, G01S13/42, G01S3/14, G01S3/48, G01S013/53, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144744 |
| 34 | 6731234 | Radar anti-fade systems and methods | A method for suppressing ground return radar fading in a radar altimeter is described. The method includes providing a radar gate width which corresponds to an area that is smaller than an antenna illumination area being impinged by transmissions of the radar altimeter, dithering the radar gate viewing area within the antenna illumination area being impinged by transmissions of the radar altimeter, and taking radar return samples with the radar altimeter | Hager James R. (Golden Valley, MN), Jordan Lavell (Bloomington, MN) | Honeywell International Inc. (Morristown, NJ) | 11.06.2003 | 04.05.2004 | G01S13/00, G01S13/18, G01S13/22, G01S7/285, G01S13/28, G01S13/88, G01S013/18, G01S13/18, G01S13/22, G01S13/288, G01S13/882 | 10/458943 |
| 35 | 6730029 | Ultrasonic transmitter/receiver by pulse compression | As shown in FIG. 2(a), according to the present invention, a quartz rod is used where, for example, the diameter of the end on the side to which an ultrasound probe attached is 0.58 mm, the diameter at the narrowest portion is 0.3 mm, the diameter at the end on the specimen side is 0.68 mm, and the length is 38 cm. As a result, the diameter on the side of fused quartz rod 20 to which ultrasound transducer 10 allows a favorable range of L (0,3) mode conversion efficiency: and in addition, the diameter of quartz rod 20 on the side coming into contact with specimen 50 is sufficiently large in comparison with wavelength, and in other portions it shows a transmission and a reception waveform | Moriya Tadashi (Kanagawa, JP), Tagawa Norio (Tokyo, JP) | Japan Science and Technology Corporation (Saitama-ken, JP) | 25.07.2002 | 04.05.2004 | A61B8/12, A61B8/00, A61B8/06, G01N29/44, G01B17/00, G01N29/24, G01N29/28, G01N29/34, G01S13/00, G01P5/24, G01P5/00, G01S15/89, G01S15/00, G01S13/28, A61B008/00, A61B8/06, A61B8/4281, G01B17/00, G01N29/2462, G01N29/2468, G01N29/28, G01N29/348, G01N29/4436, G01P5/24, G01S13/28, G01S15/8959, G01S15/8961, G01N2291/017, G01N2291/101, G01S7/52047, G01S15/8979 | 10/088638 |
| 36 | 6707419 | Radar transmitter circuitry and techniques | A radar transmitter includes a digital ramp generator circuit for generating a VCO control signal. The ramp generator includes a digital signal processor and a digital-to-analog converter. In one embodiment, the VCO output signal is up-converted to provide the transmit signal and in another embodiment, the VCO operates over the transmit frequency. Also described is a VCO comprising a DR and a phase shifter. A temperature compensation feature includes detecting the transmit frequency and comparing the DSP output generating the detected frequency to a DSP output stored in association with the detected frequency. Also described is a technique for compensating for non-linear VCO operation in which the DSP output words are adjusted to provide a waveform complementary in shape to the non-linear VCO characteristic. Susceptibility of the radar to interference is reduced by randomly varying at least one parameter of the ramp signal, such as offset interval or voltage range, in at least one ramp signal cycle | Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA), Hanson James T. (Maynard, MA) | Raytheon Company (Waltham, MA) | 16.08.2001 | 16.03.2004 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S7/02, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q13/10, H01Q1/38, H01Q3/30, H03H21/00, H01Q21/00, H01Q21/06, H01Q1/32, H01Q3/40, H03H7/01, H01Q3/24, H01Q25/00, G01S13/02, G01S13/58, G01S7/288, G01S7/285, G01S007/35, G01S007/40, G01S013/32, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931636 |
| 37 | 6693582 | Radar device and method for coding a radar device | A radar system having an arrangement for producing a code, an arrangement for modulating a transmission signal in a transmit branch, using the code, an arrangement for delaying the code, an arrangement for modulating a signal in a receive branch, using the delayed code, and an arrangement for mixing a reference signal with a receiving signal, the modulation of one of the signals being performed by an amplitude modulation (ASK: "amplitude shift keying") and the modulation of the other signal by a phase modulation (PSK: "phase shift keying"). Furthermore, a radar system is proposed in which blanking of phase transitions is provided. Also described are methods which may advantageously be carried out, using the radar systems described herein | Steinlechner Siegbert (Leonberg, DE), Brosche Thomas (Stuttgart, DE) | Robert Bosch GmbH (Stuttgart, DE) | 26.03.2003 | 17.02.2004 | G01S13/22, G01S13/28, G01S13/00, G01S13/02, G01S007/28, G01S7/023, G01S13/222, G01S13/288 | 10/240512 |
| 38 | 6683557 | Technique for changing a range gate and radar for coverage | A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. In one embodiment, a zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Also described is a detection table containing indicators of the presence or absence of an object within a respective radar beam and detect the presence of an object within the detection zone and with changing range gates in each of the antenna beams the coverage of the detection zone can be varied | Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 27.01.2004 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S7/02, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q1/38, H01Q13/10, H01Q3/30, H03H21/00, H01Q21/00, H01Q21/06, H01Q1/32, H01Q3/40, H03H7/01, H01Q3/24, H01Q25/00, G01S13/02, G01S13/72, G01S13/58, G01S7/288, G01S7/285, G01S013/04, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/930867 |
| 39 | 6680691 | Methods and apparatus for accurate phase detection | A phase processor is disclosed which is configured to receive processed radar return data from a left radar channel, a right radar channel, and an ambiguous radar channel. The phase processor comprises a plurality of phase detectors each with an input and a reference input. The phase detectors are configured to determine a phase difference between radar return data received at the input and radar return data received at the reference input | Hager James R. (Golden Valley, MN), Henrickson Jens M. (St. Paul, MN), Jordan Lavell (Bloomington, MN), Burlet Todd R. (Maple Grove, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 20.01.2004 | G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/20, G01S13/18, G01S13/28, G01S13/42, G01S13/88, G01S3/14, G01S3/48, G01S007/28, G01S007/285, G01S013/00, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144882 |
| 40 | 6674397 | Methods and apparatus for minimum computation phase demodulation | non-zero amplitude gated radar return samples and process a portion of received zero amplitude return samples. The filter also calculates past filter outputs based on filter outputs generated during previous non-zero gated radar return samples | Hager James R. (Golden Valley, MN), Jordan Lavell (Bloomington, MN), Burlet Todd R. (Maple Grove, MN), Petrich Curtis J. (Minneapolis, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 06.01.2004 | G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/20, G01S13/18, G01S13/28, G01S13/42, G01S13/88, G01S3/14, G01S3/48, G01S013/53, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144871 |
| 41 | 6670910 | Near object detection system | A near object detection (NOD) system includes a plurality of sensors, each of the sensors for providing detection coverage in a predetermined coverage zone. Each of the sensors includes a transmit antenna for transmitting a first RF signal, a receive antenna for receiving a second RF signal and a means for sharing the target data between each of the plurality of sensors in the NOD system | Delcheccolo Michael Joseph (Westford, MA), Russell Mark E. (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Pleva Joseph S. (Londonderry, NH), Firda John M. (Andover, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 31.01.2002 | 30.12.2003 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S7/02, G01S13/93, G01S13/48, G01S13/34, G01S13/04, G01S13/28, G01S13/00, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q1/38, H01Q13/10, H01Q3/30, H03H21/00, H01Q21/00, H01Q21/06, H01Q1/32, H01Q3/40, H03H7/01, H01Q3/24, H01Q25/00, G01S13/02, G01S13/58, G01S13/72, G01S7/288, G01S7/285, G01S013/93, B60K31/0008, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/723, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q3/24, H01Q3/40, H01Q13/10, H01Q21/0043, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, G01S7/288, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 10/062578 |
| 42 | 6657704 | Distance measurement apparatus | A forward electromagnetic wave is generated in accordance with a succession of pseudo random noise code signals. An echo electromagnetic wave caused by reflection of the forward electromagnetic wave at an object is converted into a received signal. Direct-current and low-frequency components are removed from the received signal to generate a filtering-resultant signal. The filtering-resultant signal is compared with a preset decision reference voltage to generate a binary signal. The binary signal is sampled into received data. Calculation is made as to a correlation between the received data and the pseudo random noise code signal. The distance to the object is computed on the basis of the calculated correlation. The pseudo random noise code signal is repetitively generated to produce a succession of the pseudo random noise code signals during a surplus time covering a stabilization time taken by the received signal to stabilize in direct-current voltage level | Shirai Noriaki (Kariya, JP), Morikawa Katsuhiro (Nagoya, JP) | Denso Corporation (Kariya, JP) | 30.05.2002 | 02.12.2003 | G01S17/00, G01S17/36, G01S13/28, G01S13/00, G01S7/493, G01S7/48, G01C003/08, G01S013/08, G01S17/36, G01S7/493, G01S13/288 | 10/157230 |
| 43 | 6657581 | Automotive lane changing aid indicator | There is disclosed a vehicle equipped with two multibeam electronically scanned radar systems that function as side object detection systems. The transmit/receive modules of the radar are illustratively located on right and left side panels of the vehicle at the rear of its body. Each radar system generates eight equal-angle beams. The radar systems are programmed so that targets are detected only within a predefined range for each of its eight beam patterns corresponding to the adjacent highway lane. As an overtaking vehicle approaches in an adjacent lane, its approach is detected sequentially by the beams on that side of the vehicle. Each radar system generates eight signals, corresponding to the eight beams positions, which are coupled individually to eight LEDs configured in an array. Detection of an overtaking vehicle within a scanned beam causes illumination of a corresponding LED. Thus, the driver of a host vehicle can easily determine the presence and position of an overtaking vehicle in an adjacent lane relative to his or her own from the position of the illuminated LED or LEDs in the array, and can also determine the closing speed of the overtaking vehicle from the rapidity of the transition of LEDs in the array being illuminated. In a preferred embodiment, the arrays are affixed to the outside mirrors in a vertical columnar configuration | Lippert Delbert (Cobden, CA), Van Rees H. Barteld (Needham, MA), Delcheccolo Michael Joseph (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Russell Mark E. (Westford, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 02.12.2003 | B60Q1/50, B60Q1/26, B60Q1/52, G01S13/87, G01S13/93, G01S13/48, G01S13/34, G01S13/04, G01S13/28, G01S13/00, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q1/38, H01Q13/10, H01Q3/30, H03H21/00, H03H7/01, H01Q21/00, H01Q21/06, H01Q1/32, H01Q3/40, H01Q3/24, H01Q25/00, G01S7/288, G01S7/285, G01S013/00, B60T007/16, B62D001/24, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/930874 |
| 44 | 6642908 | Switched beam antenna architecture | A multiple beam array antenna system comprises a plurality of radiating elements provided from stripline-fed open-ended waveguide coupled to a Butler matrix beam forming network. The Butler matrix beam forming network is coupled to a switched beam combining circuit. The antenna can be fabricated as a single Low Temperature Co-fired Ceramic (LTCC) circuit | Pleva Joseph S. (Londonderry, NH), Breglia Caroline (Methuen, MA), French Thomas W. (Acton, MA), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 04.11.2003 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/93, G01S13/48, G01S13/34, G01S13/87, G01S13/04, G01S13/28, G01S13/00, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q1/38, H01Q13/10, H01Q3/30, H03H21/00, H03H7/01, H01Q21/00, H01Q21/06, H01Q1/32, H01Q3/40, H01Q3/24, H01Q25/00, G01S13/02, G01S13/58, G01S7/288, G01S7/285, H01Q003/24, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/932574 |
| 45 | 6639545 | Methods and apparatus to determine a target location in body coordinates | A method for determining a position of a doppler radar target in aircraft body coordinates is described. The method includes calculating values for doppler circle equations, in doppler coordinates, based upon a range to the target, a vehicle velocity, and a center frequency and bandwidth of a doppler swath filter. Further, an interferometric circle in body coordinates is calculated based upon a range to the target, and an interferometric angle. The doppler circle equations are transformed into body coordinates utilizing received pitch, roll and yaw information. Finally, an intersection of the interferometric circle equations with the transformed doppler circle equations is calculated, the intersection being the position of the target in body coordinates | Hager James R. (Golden Valley, MN), Jordan Lavell (Bloomington, MN), Yaeger Larry D. (Medina, MN) | Honeywell International Inc. (Morristown, NJ) | 13.05.2002 | 28.10.2003 | G01S13/524, G01S13/00, G01S7/292, G01S13/94, G01S13/70, G01S13/20, G01S13/18, G01S13/28, G01S13/88, G01S13/42, G01S3/14, G01S3/48, G01S013/58, G01S7/292, G01S13/524, G01S3/48, G01S13/18, G01S13/20, G01S13/288, G01S13/42, G01S13/70, G01S13/882, G01S13/94 | 10/144876 |
| 46 | 6624783 | Digital array stretch processor employing two delays | A pulse-type beamforming apparatus, such as a radar array system, is used for receiving, detecting, localizing, and/or imaging desired signals. The apparatus is used to receive wideband chirp signals. The apparatus contains a receive aperture that is partitioned into multiple channels. The received signal at each channel is mixed with a replica chirp. The replica chirp is effectively delayed in a way that partially removes range-dependent distortion of desired signals. The mixer outputs are then sampled and filtered. The filters on each channel incorporate a time delay that completely removes the remaining range-dependent distortion for all signals in a desired direction. Signals are also compressed and integrated by a digital beamformer | Rabideau Daniel (Acton, MA) | Massachusetts Institute of Technology (Cambridge, MA) | 28.02.2001 | 23.09.2003 | G01S13/28, G01S13/00, G01S7/292, G01S13/02, G01S7/02, G01S7/288, G01S7/285, G01S013/00, H01Q003/00, G01S7/292, G01S13/286, G01S7/021, G01S2007/2883, G01S2013/0245 | 09/796049 |
| 47 | 6608588 | Remote sensing using Rayleigh signaling | This invention features an improved technique for search and track surveillance. In this invention, distinct and random (in both space and time) signal beams are simultaneous transmitted from an array of transmitter source elements in a manner to cover all sectors about a source location. In addition, countermeasures against a system according to the invention are difficult because the signal waveforms for each beam are distinct and random, making prediction of any signal waveform for any beam very unlikely. An array of receiver sensor elements is provided to receive signals that are scattered from remote objects and may or may not be co-located with and share the elements of the source array element. The scattered signals are received and processed to yield the direction and range of the remote objects | Elam Carl M. (Perry Hall, MD) | Greenwich Technologies Associates (Greenwich, CT) | 07.05.2001 | 19.08.2003 | G01S13/28, G01S13/00, G01S13/02, G01S013/00, G01S13/003, G01S13/288, G01S2013/0281 | 09/851450 |
| 48 | 6591171 | Autonomous landing guidance system | An aircraft guidance system uses radar imaging to verify airport and runway location and provide navigation updates. The system is applicable to flight operations in low visibility conditions | Ammar Danny F. (Broward, FL), Spires Randall C. (Palm Beach, FL), Sweet Steven R. (Broward, FL) | Honeywell International Inc. (Morristown, NJ) | 15.09.1997 | 08.07.2003 | G01S13/00, G01S13/91, G01S13/95, G01S13/44, G01S13/94, G01S13/93, G01S13/87, G01S13/28, G01S13/89, G01S7/02, G01S7/28, G01S7/41, G01S7/282, G01S7/285, G06F019/00, F41G7/2226, G01C21/005, G01S13/4418, G01S13/4427, G01S13/4463, G01S13/913, G01S13/953, G01S7/282, G01S7/285, G01S7/412, G01S13/28, G01S13/87, G01S13/89, G01S13/9303, G01S13/94, G01S2013/0263 | 08/929820 |
| 49 | 6587072 | Pulse radar detection system | A radar based sensor detection system comprises a microwave source operative to provide a continuous wave signal at an output. A pulse-former is coupled to the output of the source and is operative to provide at an output a variable length pulse that increases the transmitted energy of the radar system according to the range of object detection. A modulator is coupled to the output of the pulse-former for providing a modulated pulse signal. A transmit receive switch coupled to the output of the modulator is selectively operative between a first transmit position and a second receive position. A transmit channel coupled to the transmit receive switch transmits the pulse signal when the switch is operated in the transmit position. A receiving channel coupled to the transmit receive switch receives the modulator signal when the switch is operated in the receive position. First and second voltage multipliers each have a local oscillator input for receiving the modulator signal in the receive position, and each have an input signal port, and an output port. A receiver channel receives a reflected transmitted signal from an output and applies the received signal to the receive signal input ports of the voltage multipliers. An autocorrelator coupled to the output ports of the voltage multipliers correlates the received signal to produce an output signal indicating the detection and position of the object | Gresham Robert Ian (Somerville, MA), Egri Robert (Wayland, MA) | M/A-Com, Inc. (Lowell, MA) | 22.03.2002 | 01.07.2003 | G01S13/00, G01S13/18, G01S13/28, G01S13/10, G01S7/28, G01S7/282, G01S7/288, G01S7/285, G01S001/02, G01S7/282, G01S7/288, G01S13/106, G01S13/18, G01S13/288, G01S2007/2886 | 10/104633 |
| 50 | 6577269 | Radar detection method and apparatus | A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. In one embodiment, a zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Also described is a detection table containing indicators of the presence or absence of an object within a respective radar beam and detect the presence of an object within the detection zone | Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 10.06.2003 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/00, G01S13/34, G01S13/93, G01S13/48, G01S13/87, G01S13/04, G01S13/28, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q13/10, H01Q3/30, H03H21/00, H03H7/01, H01Q21/06, H01Q1/32, H01Q3/40, H01Q3/24, H01Q1/38, H01Q21/00, H01Q25/00, G01S13/02, G01S13/58, G01S13/72, G01S7/288, G01S7/285, G01S013/02, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/930869 |
| 51 | 6538599 | Noncoherent gain enhancement technique for non-stationary targets | A radar system and radar processing method includes a number of aspects for providing improved function. The system and method may employ one or more of the following aspects:timely range-velocity (range-Doppler) compensation for target nonstationarity by integration along hypothesized range-Doppler trajectories, allowing noncoherent integration over an elongated time interval: noncoherent integration of an enlarged signal set obtained from overlapped coherent processing intervals (CPIs): hypothesized joint multiple accelerations used to generate multiple hypothesized range-Doppler trajectories: and sliding window integration to increase data output rates with use of large noncoherent integration intervals (NCIs). These aspects allow for improved signal-to-noise ratios, for acquisition and tracking of targets at longer ranges, and for improved target parameter estimation | David George Thomas (late of Oro Valley, AZ) | Raytheon Company (Lexington, MA) | 16.11.2001 | 25.03.2003 | G01S13/58, G01S13/00, G01S7/292, G01S13/44, G01S13/28, G01S013/52, G01S7/2926, G01S13/582, G01S13/288, G01S13/4463 | 09/992459 |
| 52 | 6531976 | Adaptive digital beamforming radar technique for creating high resolution range profile for target in motion in the presence of jamming | A wideband adaptive digital beamforming technique for maintaining a high range resolution profile of a target in motion in the presence of jamming utilizes a sequence of adaptively calculated narrowband jamming cancellation weights. The adaptive weights are calculated such that the desired frequency dependent gain is maintained toward the target center. These adaptive weights tend to preserve the range profile quality and low range sidelobes. This technique also tends to eliminate signal cancellation problems as well as adaptive weight modulation effects | Yu Kai Bor (Niskayuna, NY) | Lockheed Martin Corporation (Family ID: 25488434 | 07.09.2001 | 11.03.2003 | G01S13/00, G01S13/42, G01S13/28, G01S13/32, G01S7/02, G01S7/28, G01S7/36, G01S7/41, G01S007/36, G01S013/00, G01S7/2813, G01S7/36, G01S7/411, G01S13/003, G01S13/282, G01S13/32, G01S13/426 | 09/948959 |
| 53 | 6522290 | Transmit phase removal in FM homodyne radars | In a homodyne-receiver radar system used for ranging and/or target detection, the frequency-modulated (FM) transmit phase are removed from the received signal. Removal of the known FM transmit phase from the received signal reduces the bandwidth of the received signal to half that of a system that does not remove the transmit phase. This allows the sampling rate, and thus the processor throughput, to be cut in half. With the FM transmit phase removed, the phase sequence of the processed signal is akin to a delayed version of the transmit signal phase history. This allows the range processing to use segments of a single phase sequence for processing all range gates, resulting in a large reduction in the amount of coefficient storage used for the matched-phase sequences required to process the set of range gates | Mattox Barry G. (Orlando, FL) | Lockheed Martin Corporation (Bethesda, MD) | 29.05.2001 | 18.02.2003 | G01S17/00, G01S17/32, G01S7/02, G01S7/40, G01S7/48, G01S7/35, G01S7/487, G01S13/34, G01S13/00, G01S13/28, G01S7/288, G01S7/285, G01S013/00, G01S013/08, G01S013/58, G01S7/352, G01S7/4021, G01S7/487, G01S17/325, G01S13/28, G01S13/34, G01S2007/2883, G01S2007/2886 | 09/865594 |
| 54 | 6501415 | Highly integrated single substrate MMW multi-beam sensor | A multiple beam array antenna system comprises a plurality of radiating elements provided from stripline-fed open-ended waveguide coupled to a Butler matrix beam forming network. The Butler matrix beam forming network is coupled to a switched beam combining circuit. The antenna can be fabricated as a single Low Temperature Co-fired Ceramic (LTCC) circuit | Viana Luis M. (Wakefield, MA), Delcheccolo Michael Joseph (Westford, MA), Pleva Joseph S. (Londonderry, NH), Russell Mark E. (Westford, MA), Woodington Walter Gordon (Lincoln, MA), Van Rees H. Barteld (Needham, MA), LeBlanc Stephen P. (Stratham, NH) | Raytheon Company (Lexington, MA) | 16.08.2001 | 31.12.2002 | B60K31/00, B60Q1/50, B60Q1/26, B60Q1/52, G01S13/00, G01S13/87, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q13/10, H01Q3/30, H03H21/00, H03H7/01, H01Q21/06, H01Q1/38, H01Q1/32, H01Q3/40, H01Q3/24, H01Q21/00, H01Q25/00, G01S13/02, G01S13/58, G01S7/288, G01S7/285, G01S013/04, G01S013/93, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931277 |
| 55 | 6492949 | Slot antenna element for an array antenna | A multiple beam array antenna system comprises a plurality of radiating elements provided from stripline-fed open-ended waveguide coupled to a Butler matrix beam forming network. The Butler matrix beam forming network is coupled to a switched beam combining circuit. The antenna can be fabricated as a single Low Temperature Co-fired Ceramic (LTCC) circuit | Breglia Caroline (Methuen, MA), Pleva Joseph S. (Londonderry, NH), French Thomas W. (Acton, MA), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA) | Raytheon Company (Lexington, MA) | 16.08.2001 | 10.12.2002 | B60K31/00, B60Q1/26, B60Q1/52, B60Q1/50, G01S13/00, G01S13/87, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q3/30, H01Q13/10, H03H21/00, H03H7/01, H01Q21/06, H01Q1/32, H01Q3/40, H01Q3/24, H01Q1/38, H01Q21/00, H01Q25/00, G01S13/02, G01S13/58, G01S13/72, G01S7/288, G01S7/285, H01Q001/38, H01Q001/48, H01Q013/10, B60K31/0008, B60Q1/2665, B60Q1/525, B60Q9/008, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q3/24, H01Q3/40, H01Q13/10, H01Q21/0043, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60W2530/10, G01S7/288, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/931633 |
| 56 | 6489927 | System and technique for mounting a radar system on a vehicle | A system and technique for mounting a radar to a vehicle provides a mounting that does not interfere with the aesthetic appearance of a vehicle, that does not interfere with the aerodynamic performance of the vehicle, and offers optimal radar transmission efficiency. The vehicle can be an automobile or any other vehicle to which a radar system is applied | LeBlanc Stephen P. (Stratham, NH), Pleva Joseph S. (Londonderry, NH), Woodington Walter Gordon (Lincoln, MA), Delcheccolo Michael Joseph (Westford, MA), Russell Mark E. (Westford, MA), Van Rees H. Barteld (Needham, MA), Breglia Caroline (Methuen, MA), Donovan Richard P. (Windham, NH) | Raytheon Company (Lexington, MA) | 16.08.2001 | 03.12.2002 | B60K31/00, B60Q1/26, B60Q1/52, B60Q1/50, G01S13/00, G01S13/87, G01S13/93, G01S13/34, G01S13/48, G01S13/04, G01S13/28, G01S7/02, G01S7/03, G01S7/40, G01S7/35, G01S7/04, G01S7/26, H01Q3/30, H01Q13/10, H03H21/00, H03H7/01, H01Q21/06, H01Q1/32, H01Q1/42, H01Q3/40, H01Q3/24, H01Q1/38, H01Q21/00, H01Q25/00, G01S13/02, G01S13/58, G01S7/288, G01S7/285, H01Q001/32, B60K31/0008, B60Q1/525, B60Q9/008, G01S7/023, G01S7/032, G01S7/06, G01S7/352, G01S7/4004, G01S7/4021, G01S13/04, G01S13/282, G01S13/343, G01S13/48, G01S13/87, G01S13/931, H01Q1/3233, H01Q1/3258, H01Q1/3283, H01Q1/38, H01Q1/42, H01Q3/24, H01Q3/40, H01Q13/10, H01Q13/18, H01Q21/0043, H01Q21/0075, H01Q21/0087, H01Q21/065, H01Q25/00, H03H7/0153, H03H21/0012, B60T2201/08, B60T2201/081, B60T2201/088, B60W2530/10, B60W2550/304, G01S7/288, G01S7/4008, G01S13/584, G01S13/726, G01S2013/0245, G01S2013/9321, G01S2013/9332, G01S2013/9375, G01S2013/9378, G01S2013/9385, G01S2013/9389 | 09/930868 |
| 57 | 6469661 | Correction of I/Q channel errors without calibration | A method of providing a balanced demodular output for a signal such as a Doppler radar having an analog pulsed input: includes adding a variable phase shift as a function of time to the input signal, applying the phase shifted input signal to a demodulator: and generating a baseband signal from the input signal. The baseband signal is low-pass filtered and converted to a digital output signal. By removing the variable phase shift from the digital output signal, a complex data output is formed that is representative of the output of a balanced demodulator | Doerry Armin W. (Albuquerque, NM), Tise Bertice L. (Albuquerque, NM) | Sandia Corporation (Albuquerque, NM) | 19.01.2001 | 22.10.2002 | G01S7/288, G01S7/285, H03D1/22, H03D1/00, G01S13/00, G01S13/28, H04L27/00, G01S007/285, H04B001/10, G01S7/288, H03D1/2245, G01S13/282, G01S2007/2886, H04L2027/0016 | 09/766322 |
| 58 | 6430480 | Autonomous landing guidance system | An aircraft guidance system uses radar imaging to verify airport and runway location and provide navigation updates. The system is applicable to flight operations in low visibility conditions | Ammar Danny F. (Broward, FL), Spires Randall C. (Palm Beach, FL), Sweet Steven R. (Broward, FL) | Honeywell International INC (Morristown, NJ) | 31.07.2000 | 06.08.2002 | G01C21/00, G01S13/00, F41G7/22, F41G7/20, G01S13/91, G01S13/95, G01S13/44, G01S13/87, G01S13/02, G01S13/94, G01S13/93, G01S13/28, G01S13/89, G01S7/02, G01S7/28, G01S7/41, G01S7/282, G01S7/285, G06F019/00, F41G7/2226, G01C21/005, G01S13/4418, G01S13/4427, G01S13/4463, G01S13/913, G01S13/953, G01S7/282, G01S7/285, G01S7/412, G01S13/28, G01S13/87, G01S13/89, G01S13/9303, G01S13/94, G01S2013/0263 | 09/630160 |
| 59 | 6404338 | Measuring and/or security system | Measuring and/or control system (1) for detection of the distance of an object (2) or of a person from a predetermined reference point, with a first transmitting/receiving device (10) for generation and wireless transmission of a control signal to a separate second transmitting and/receiving device (30), as well as for receipt of an acknowledgment signal generated from the second transmitting/receiving device (30) upon receipt of the control signal, whereby both of the transmitting/receiving devices display on the transmitting side a signal source (23, 24, 25, 26) that generates as a control and/or as an acknowledgment signal, pulses that display during the duration of the pulse a monotonically falling or rising frequency, or that consists of a super-position of these types of pulses in pairs, the other current transmitting/receiving device (10, 30) displaying on the receiving side for time compression of the received pulses, at least one dispersion filter (11) having a predetermined frequency-dependent signal transit time, which is matchedadapted to the transmitting side modulation such that the spectral signal portions of the control and/or acknowledgment signal, because of the frequency-dependent different signal transit time through the dispersion filter (11), appears at its output essentially coincidentally and, therewith, with little temporal imprecision | Koslar Manfred (Berlin, DE) | Nanotron Gesellschaft fur Mikrootechnik mbH (Berlin, DE) | 26.04.1999 | 11.06.2002 | G01S13/00, G01S13/76, G01S13/28, G08B13/14, G08B013/14, G01S13/282, G01S13/76, G08B13/1427, G08B21/023 | 09/297154 |
| 60 | 6392588 | Multifrequency signal structure for radar systems | A multifrequency phase-coded signal structure is presented for use in a system like a radar or sonar or detecting a remote target. The signal structure comprises at least one pulse signal in the form of a mutually complementary set of M sequences, each sequence being composed of M phase-modulated bits. Each two adjacent sequences are modulated on subcarriers separated by a frequency f.sub.s such that f.sub.s =1/t.sub.b, t.sub.b being a bit duration, and a the subcarriers are transmitted simultaneously | Levanon Nadav (Ramat Gan, IL) | Ramot University Authority for Applied Research & Industrial Development Ltd. (Tel Aviv, IL) | 03.05.2000 | 21.05.2002 | G01S13/00, G01S13/28, G01S007/282, G01S13/288 | 09/564650 |
| 61 | 6388605 | Circuit for generating and/or detecting a radar signal | The invention relates to a circuit for generating and/or detecting a radar signal for synthetic aperture radar in which the radar signal is subdivided into N sub-bands which are processed in parallel in N processing channels, each having a first mixer for processing in-phase signals, and a second mixer for processing quadrature signals. In the circuit the mixers of the N processing channels are in the form of identical mixer modules each comprising at least one mixer, and each module is associated with at least one external element for adjusting the mixer module in correspondence with the sub-band with which it is associated | Petz Anton Felix (Xa Leiderdorp, NL), Venkata Narasimha Cheemalamarri (Ahmedabad, IN) | Agence Spatiale Europeenne (Paris, FR) | 09.06.2000 | 14.05.2002 | G01S13/00, G01S13/90, G01S13/28, G01S7/28, G01S7/282, H03D7/14, G01S7/288, G01S7/285, G01S013/90, G01S7/282, G01S13/282, G01S13/90, H03D7/1408, G01S2007/2886 | 09/590132 |
| 62 | 6381261 | Random pulse type radar apparatus | A random pulse type radar apparatus sends out as an output signal a spectrum spread radio wave including a pseudo random signal-less period and receives echoes in this signal-less period to thereby significantly reduce transmission peak power. The random pulse type radar apparatus comprises a transmitter for generating a hybrid type spectrum spread signal by simultaneously using two kinds of modulations which are phase shift keying modulation for selecting a phase of a transmission radio wave in accordance with a pseudo noise digital code and outputting the transmission wave, and time hopping modulation for stopping transmission of a radio wave at random in accordance with the pseudo noise digital code: a receiving unit for selectively detecting an echo of a transmission signal radio wave, generated by the transmitter, from a target with a time delay: at least one a common antenna unit for use both for transmission and reception or antenna units installed close to each other and respectively serving single functional units: and a reception control unit for stopping an action of the receiving unit in a time zone in which the transmitter is outputting radio waves in accordance with the time hopping modulation, whereby a spatial distribution of an intensity of an echo of a transmitted radio wave is measured through computation of a cross-correlation function of a transmission signal and a reception signal | Nagazumi Yasuo (Tokyo, JP) | G.D.S. Co., Ltd. (Tokyo, JP), Nagazumi Yasuo (Tokyo, JP) | 23.11.1998 | 30.04.2002 | G01S13/00, G01S13/22, G01S13/28, H04B015/00, H04K001/00, H04L027/30, G01S13/222, G01S13/288, G01S13/286 | 09/197696 |
| 63 | 6373434 | Distance detecting method and its apparatus | A signal having periodicity is transmitted to a communication station B based on a reference timing generated by a timer which a communication station A has, while the communication station B, which has received a transmitting signal of the communication station A, receives a signal generated based on a reference timing generated in its internal section and transmitted, and a phase difference between the transmitting signal and the received signal is detected so as to detect a distance between the communication station A and the communication station B | Hayakawa Tadashi (Yokohama, JP) | Matsushita Electric Industrial Co., Ltd. (Osaka, JP) | 02.03.1999 | 16.04.2002 | G01S13/00, G01S13/84, G01S13/36, G01S13/28, G01S13/32, G01S001/24, G01S13/84, G01S13/284, G01S13/325, G01S13/36 | 09/260494 |
| 64 | 6359524 | Modulation pulse-top ripple compensation for a travelling wave tube pulser | A circuit for applying a compensating ripple signal at a low voltage point, such as the collector electrode of a travelling wave tube to compensate for pulse-top ripple extant on a high voltage pulse applied at the travelling wave tube cathode, to provide a substantially constant voltage across the travelling wave tube during pulsing to preserve its radio frequency phase and amplitude characteristics. The portion of the pulse-top including the undesired ripple is compared against the applied compensating collector signal and the result is digitized and stored discretely in a plurality of sample bins over the duration of the modulation pulse. The stored digital values are updated over a plurality of successive modulation pulses until an equalibrium is reached, a random access memory being arranged to provide a readout over one half of each of the sample bins and to receive updating in the remaining halves of the corresponding sample bins | Loucks Richard Sidney (Northridge, CA) | ITT Manufacturing Enterprises, Inc. (Wilmington, DE) | 07.12.1981 | 19.03.2002 | H03F3/54, H03F3/58, H03K5/01, G01S13/00, G01S13/28, G01S7/28, G01S7/282, H03K007/00, H03F3/58, H03K5/01, G01S7/282, G01S13/288 | 06/328127 |
| 65 | 6347264 | High accuracy, high integrity scene mapped navigation | An aircraft including an approach and landing system, including a navigation unit for providing navigation information, a weather radar unit for providing radar information, a processor which receives navigation information from the navigation unit and information from the weather radar unit, the processor unit providing an output representing information concerning the aircraft in accordance with the provided navigation information and radar information, a memory for storing information representing a scene, the processor unit correlating the stored scene information with the output representing information concerning the aircraft to provide a mapped scene, a display unit for displaying the output of said processor and the mapped scene, and a steppable frequency oscillator for providing a signal which is stepped in frequency to the weather radar unit, thereby providing an increased range resolution | Nicosia Joseph M. (Carlsbad, CA), Loss Keith R. (Escondido, CA), Taylor Gordon A. (Escondido, CA) | Winged Systems Corporation (Caldwell, TX) | 07.03.2001 | 12.02.2002 | G01C21/10, G01C23/00, G01C21/16, G01S13/00, G01S13/91, G01S13/95, G01S13/90, G01S13/28, G01S7/02, G01S7/41, G05D1/06, G05D1/00, G08G5/00, G08G5/02, G01S13/86, G01S5/14, G06F017/00 | 09/799723 |
| 66 | 6313782 | Coded phase modulation communications system | A coded phase modulation communications system which relates to communications systems in which undesired detectability of the radiated signal is materially reduced, and wherein the vulnerability of the system to interfering signals, such as, intentional jamming signals, is substantially reduced. In the system, a radio frequency communications signal is phase modulated by a random or random appearing, but repeatable pattern of noise signal. The received signal is modulated by an identical noise signal, which when synchronized with the original noise modulation results in erasing the noise, and thereby recreating the original, continuous, communications signal. The noise source of the system is a pseudo noise generator that may be readily synchronized with an identical noise source or sources. The pseudo noise generator provides an apparently or at a remote location or locations | Lehan Frank W. (Glendale, CA), Rechtin Eberhardt (Pasadena, CA), Victor Walter K. (Altadena, CA) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 16.11.1960 | 06.11.2001 | G01S13/00, G01S13/28, G01S7/02, G01S7/35, H04B1/707, G01S007/36, G01S7/35, G01S13/288, H04B1/71 | 04/069775 |
| 67 | 6311108 | Autonomous landing guidance system | An aircraft guidance system uses radar imaging to verify airport and runway location and provide navigation updates. The system is applicable to flight operations in low visibility conditions | Ammar Danny F. (Coral Springs, Broward, FL), Spires Randall C. (Boca Raton, Palm Beach, FL), Sweet Steven R. (Coral Springs, Broward, FL), Family ID | --- | 31.07.2000 | 30.10.2001 | G01C21/00, G01S13/00, F41G7/22, F41G7/20, G01S13/91, G01S13/95, G01S13/44, G01S13/94, G01S13/02, G01S13/93, G01S13/87, G01S13/28, G01S13/89, G01S7/02, G01S7/28, G01S7/41, G01S7/282, G01S7/285, G01S013/42, G01S013/02, F41G7/2226, G01C21/005, G01S13/4418, G01S13/4427, G01S13/4463, G01S13/913, G01S13/953, G01S7/282, G01S7/285, G01S7/412, G01S13/28, G01S13/87, G01S13/89, G01S13/9303, G01S13/94, G01S2013/0263 | 09/630156 |
| 68 | 6285885 | Mobile communication apparatus with distance measuring unit | A first station can communicate with a second station by radio. The second station has a function of repeating a received radio signal. A radio communication apparatus in the first station includes a first device for transmitting a first radio-frequency signal containing a predetermined pseudo-noise code signal toward the second station. In the radio communication apparatus, detection is made as to a first timing at which the first device transmits the first radio-frequency signal. A second radio-frequency signal is received by the radio communication apparatus after the first device transmits the first radio-frequency signal. The second radio-frequency signal is converted into a baseband signal. A memory stors the predetermined pseudo-noise code signal. Calculation is made as to a correlation between the baseband signal and the predetermined pseudo-noise code signal stored in the memory. A second timing at which the calculated correlation peaks substantially is detected. The time interval between the first timing and the second timing is calculated. The distance between the first station and the second station is calculated on the basis of the calculated time interval | Honda Shoichiro (Yokohama, JP) | Matsushita Electric Industrial Co., Ltd. (Osaka, JP) | 18.02.1998 | 04.09.2001 | G01S13/00, G01S13/76, G01S13/28, H04Q007/20, G01S13/284, G01S13/76, G01S13/767 | 09/025733 |
| 69 | 6278397 | Quiet radar method and apparatus | A random signal radar unit transmits a variable signal modulated by random noise (at 35). The return signal from the target area is correlated (at 61) with a sample of the transmitted signal, effectively compressing the spread spectrum waveform into a narrow band signal. The result is a covert high resolution radar which can be instrumented to operate in a number of single-or multi-mode configurations. By randomly varying biphase modulation (at 41, 35) and by modulating (at 49) the echo signal with the modulation delayed by a time equivalent to that of a leakage delay, a random signal is produced (at 35, 39) in which leakage return signals are readily filtered (at 53, 59) | Chiles William H. (Mishawaka, IN), Moser Kenneth Raymond (South Bend, IN) | Honeywell International Inc. (Morristown, NJ) | 26.12.2000 | 21.08.2001 | G01S13/00, G01S13/18, G01S13/28, G01S7/03, G01S7/40, G01S13/02, G01S13/58, G01S13/88, G01S013/26, G01S7/03, G01S7/4008, G01S13/18, G01S13/288, G01S7/4052, G01S13/582, G01S13/882, G01S2013/0281 | 09/748421 |
| 70 | 6219594 | Landing area obstacle detection radar system | An aircraft including an approach and landing system, including a navigation unit for providing navigation information, a weather radar unit for providing radar information, a processor which receives navigation information from the navigation unit and information from the weather radar unit, the processor unit providing an output representing information concerning the aircraft in accordance with the provided navigation information and radar information, a memory for storing information representing a scene, the processor unit correlating the stored scene information with the output representing information concerning the aircraft to provide a mapped scene, a display unit for displaying the output of said processor and the mapped scene, and a steppable frequency oscillator for providing a signal which is stepped in frequency to the weather radar unit, thereby providing an increased range resolution | Nicosia Joseph M. (Carlsbad, CA), Loss Keith R. (Escondido, CA), Taylor Gordon A. (Escondido, CA) | Winged Systems Corporation (Caldwell, TX) | 18.10.1999 | 17.04.2001 | G01C21/10, G01C23/00, G01C21/16, G01S13/00, G01S13/95, G01S13/91, G01S13/90, G01S13/28, G01S7/02, G01S7/41, G05D1/06, G05D1/00, G08G5/00, G08G5/02, G01S13/86, G01S5/14, G06F017/00, G01C21/165, G01C23/005, G01S7/412, G01S13/286, G01S13/9035, G01S13/913, G01S13/953, G01S19/15, G05D1/0676, G08G5/0021, G08G5/0065, G08G5/0086, G08G5/0091, G08G5/025, G01S13/86, G01S13/90, G01S19/52 | 09/419767 |
| 71 | 6211812 | Quiet radar method and apparatus | A random signal radar unit transmits a variable signal modulated by random noise (at 35). The return signal from the target area is correlated (at 61) with a sample of the transmitted signal, effectively compressing the spread spectrum waveform into a narrow band signal. The result is a covert high resolution radar which can be instrumented to operate in a number of single-or multi-mode configurations. By randomly varying biphase modulation (at 41, 35) and by, modulating (at 49) the echo signal with the modulation delayed by a time equivalent to that of a leakage delay, a random signal is produced (at 35, 39) in which leakage return signals are readily filtered (at 53, 59) | Chiles William H. (Mishawaka, IN), Moser Kenneth Raymond (South Bend, IN) | AlliedSignal Inc. (Morristown, NJ) | 10.12.1982 | 03.04.2001 | G01S13/00, G01S13/18, G01S13/28, G01S7/03, G01S7/40, G01S13/02, G01S13/58, G01S13/88, G01S013/08, G01S7/03, G01S7/4008, G01S13/18, G01S13/288, G01S7/4052, G01S13/582, G01S13/882, G01S2013/0281 | 06/448455 |
| 72 | 6208285 | Pulse compressor for doppler tolerant radar | A radar system employing Doppler tolerant radar pulses such as linear FM or hyperbolic FM chirps includes a pulse compressor configured as a digital finite impulse response filter. In one embodiment, the radar returns are split into in-phase and quadrature phase components for manipulation in complex form within the filter | Burkhardt Phillip E. (Melville, NY) | Northrop Grumman Corporation (Los Angeles, CA) | 10.02.1983 | 27.03.2001 | G01S13/00, G01S13/524, G01S13/28, G01S7/292, G01S013/38, G01S7/2921, G01S13/282, G01S13/524 | 06/465657 |
| 73 | 6163564 | Virtual beam system | A virtual beam system operating in an environment, including a non-compatible receiver, includes a transmitting subsystem and a receiving subsystem. The transmitting subsystem includes an array of transmitting elements and an element position encoded composite signal generator for generating an element position encoded composite signal. The array of transmitting elements is operatively coupled to the signal generator. The transmitting subsystem radiates the element position encoded composite signal via the array of transmitting elements. The receiving subsystem is responsive to the element position encoded composite signal and includes a receiving element and an element position encoded composite signal decoder for decoding the element position encoded composite signal. The receiving element is operatively coupled to the signal decoder. The element position encoded composite signal appears to be radiated as a wide beam, with relatively low directive gain, when received and decoded by the non-compatible receiver. Conversely, the element position encoded composite signal appears to be radiated as a narrow beam, with relatively high directive gain, when received by the receiving element and decoded by the signal decoder of the receiving subsystem | Rudish Ronald (Commack, NY), Levy Joseph (Merrick, NY) | AIL Systems, Inc. (Deer Park, NY) | 11.08.1998 | 19.12.2000 | G01S13/00, G01S13/32, H01Q3/30, H01Q3/26, H04B7/08, H04B1/69, H04B7/04, G01S13/02, G01S13/28, H04B001/69, G01S7/023, G01S13/325, H01Q3/26, H01Q3/2605, H01Q3/30, H04B1/69, H04B7/0408, H04B7/086, G01S13/288, G01S2013/0281 | 09/132037 |
| 74 | 6147638 | Method for operating a radar system | In a method for operating a radar system, the object is to determine by simple means and at low cost the distance and/or the radial velocity of at least one target object with high resolution. For this purpose, in each measuring phase of the measurement process in the "pulse FMCW radar system", switchover between a transmission mode and a receiving mode is effected a multiple number of times and at short intervals of time. In the transmission mode, all receiving units of the radar system are switched off, while a pulse-shaped (frequency-modulated) transmission signal with time-successive transmission pulses having a specific pulse-on time and a specific carrier frequency is emitted from at least one transmitter unit of the radar system. In receiving mode, all transmitter units are switched off in the pulse-off times of the transmission pulses, while from at least one receiver unit all reflection signals originating from the last emitted transmission pulse are detected as received signal from the entire observation range before emission of the next transmission pulse. The distance and/or the radial velocity of the reflection objects is determined indirectly by the signal processing unit of the radar system by evaluation of the frequency difference and/or phase difference between the transmission signal and the received signal | Rohling Hermann (Wolfenbuttel, DE), Mende Ralph (Braunschweig, DE) | Automotive Distance Control Systems (DE) | 10.12.1998 | 14.11.2000 | G01S13/00, G01S13/58, G01S13/28, G01S13/34, G01S13/24, G01S13/93, G01S13/32, G01S7/02, G01S013/36, G01S013/58, G01S13/28, G01S13/58, G01S13/24, G01S13/32, G01S13/345, G01S13/931 | 09/208415 |
| 75 | 6147560 | Method and device relating to supervision and control of an oscillator signal | The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation of the oscillator signal. According to the invention, the controllable oscillator is controlled by a controlling voltage, which in turn is modified by a correction signal, generated in a control loop. A time discrete representation of a secondary phase is generated in the control loop, the secondary phase corresponding to a frequency being the difference between the frequency of the oscillator signal and a constant frequency. A time discrete approximation signal is generated in dependence of the time discrete representation of the secondary phase. A time discrete error signal is generated in dependence of the time discrete approximation signal, the time discrete error signal indicating the difference between the actual frequency slope of the oscillator signal and a desired frequency slope. The correction signal is generated in dependence of the time discrete error signal. The control loop can also be adaptive, meaning that data from one control sequence is being used in a later control sequence | Erhage Lars I. (Goteborg, SE), Erikmats Osten E. (Molnlycke, SE), Rizell Svenolov (Gr.ang.bo, SE), Karlsson H.ang.kan L. (Kungsbacka, SE) | Telefonaktiebolget LM Ericsson (Stockholm, SE) | 26.01.1998 | 14.11.2000 | G01S7/40, H03C3/00, H03L7/02, H03C3/08, H03B23/00, G01S13/00, G01S13/34, G01S13/28, H03B023/00, H03L007/00, G01S7/4008, H03B23/00, H03C3/08, H03L7/02, G01S13/282, G01S13/34 | 09/013220 |
| 76 | 6137437 | Spaceborne scatterometer | A scatterometer orbiting around the earth globe comprises a single fanbeam radar antenna which is rotated around a vertical axis, at a slow rotation rate. The antenna foot-print sweeps a circular disc. The slow conical sweep combined with the motion of the satellite on which the scatterometer is mounted results in highly overlapping successive sweeps such that an image pixel is revisited many times during an overpass. The pixels in the radial direction are resolved by range-gating the radar echo. The radar operates in the C-band. The scatterometer is intended, in particular, to determine wind speed and direction over the ocean | Lin Chung-Chi (Rijnsburg, NL), Wilson John Julian William (London, GB), Impagnatiello Fabrizio (Rome, IT), Park Peter (Beaconsfield, CA) | Agence Spatiale Europeenne (Paris, FR) | 24.03.1999 | 24.10.2000 | G01S13/00, G01S13/95, G01S13/42, G01S13/28, G01S013/60, G01S13/422, G01S13/955, G01S13/28 | 09/275020 |
| 77 | 6091356 | Chirp source with rolling frequency lock for generating linear frequency chirps | A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate a chirp. The FM coil is coupled to receive a PLL error signal. The PLL receives a sample of the output signal from the YIG oscillator at one input and a linear chirp reference signal at the other input generated by a DDS chirp generator. Any variation between the linear chirp frequency at any instant and the actual frequency output by the YIG is corrected by an error signal to the FM coil to correct for nonlinearities of the YIG caused by variations in the chirp rate, the rate of change of frequency per second per chirp, temperature variations and microphonics | Sanders Michael Lee (Livermore, CA), Ashton John Hunt (Livermore, CA) | Sensor Concepts Incorporated (Family ID: 22606066 | 05.10.1998 | 18.07.2000 | G01S13/00, G01S13/28, G01S7/28, G01S7/282, H03B23/00, G01S7/02, G01S7/35, G01S007/282, H03B023/00, G01S7/282, G01S13/282, H03B23/00, G01S7/35 | 09/167130 |
| 78 | 6087981 | Method for pulse compression with a stepped frequency waveform | The present invention relates to radars and sonars, and more particularly to a synthetic-band technique of pulse compression making it possible to reach a very high distance resolution. Synthetic band consists in transmitting a waveform pattern consisting of a string of N coherent elementary pulses, linearly frequency-modulated, following one another at a recurrence frequency F.sub.r, of rectangular frequency spectra of elementary band B and of stepped carrier frequencies such that their frequency spectra will link up exactly one ahead of another to form a global spectrum of width N.times.B. On reception, the frequency spectra of the signals received in return for the N elementary pulses of a pattern are extracted by calculation, translated and juxtaposed so as to reconstruct a global frequency spectrum of width N.times.B and then compressed. Pulse compression is thus obtained which is equivalent to that which would result from the transmission of a waveform having a single pulse of frequency band N.times.B as pattern, whereas only elementary pulses of frequency band of width B were transmitted | Normant Eric (Montigny le Bretonneux, FR), Cottron Rodolphe (Issy les Moulineaux, FR) | Thomson-CSF (Paris, FR) | 22.03.1999 | 11.07.2000 | G01S13/00, G01S13/28, G01S013/28, G01S013/90, G01S007/292, G01S015/08, G01S13/282 | 09/147851 |
| 79 | 6072423 | Method for measuring the doppler shift in a sensor system using ambiguous codes | The invention relates to methods which make it possible to measure the Doppler shift of the echoes of a detection system. That is, the present invention modulates the frequency of the pulses of the transmissions of this system by a pseudohyperbolic function such that a restricted number of copies of the transmission signal can be used to perform the correlation operations on reception and to have them followed by an interpolation operation | Doisy Yves (Grasse Plascassier, FR), Chalaron Fran.cedilla.ois (Tourette sur Loup, FR), Deruaz Laurent (Mouans Sartoux, FR) | Thomson Marconi Sonar S.A.S. (Sophia Antipolis, FR) | 20.04.1999 | 06.06.2000 | G01S13/00, G01S13/58, G01S15/58, G01S15/00, G01S13/28, G01S15/10, G01S013/50, G01S13/581, G01S15/582, G01S13/28, G01S15/104 | 09/284469 |
| 80 | 6072419 | Method for the processing of the reception signal of a deramp type synthetic aperture radar | A Deramp type radar used in synthetic aperture radar for radar imaging transmits coherently repeated linear frequency-modulated pulses and carries out a sort of pulse compression in reception by demodulation of the echo signals received by means of a frequency ramp that reproduces all or part of a transmitted pulse, and by a Fourier transform performed in range. The application to a Deramp type radar signal of a standard SAR processing is disturbed by the fact that, in this signal, the effectively demodulated part of an echo signal due to a target has a position with respect to this echo signal and a duration that are variable as a function of the distance from the target to the radar. The proposed method makes it possible to eliminate this disturbance by means of a particular choice of a common temporal support used for the demodulation of the signals of all the targets of the useful swath and a phase correction applied to the level of the pulse response of the image focusing filter of the SAR processing. Secondarily, a second phase correction can be applied to the complex reflection coefficients obtained for the dots of the image at the end of the SAR processing | Normant Eric (Montigny le Bretonneux, FR) | Thomson-CSF (Paris, FR) | 13.05.1998 | 06.06.2000 | G01S13/90, G01S13/00, G01S13/28, G01S013/90, G01S13/282, G01S13/9035 | 09/076491 |
| 81 | 6067043 | Pulse compression radar | The invention concerns a method of synthesizing a replica used in the compression filter of pulse compression radar. The replica is calculated from the spectrum of a required impulse response. The required impulse response is preferably obtained from an analytical function, such as a sinc function or a weighted sinc function, and a template. It is preferable to use calibration signals of the instrument to calculate the replica. The invention also applies to synthetic aperture radar | Faure Alain (Pins Justaret, FR), Suinot Noel (Escalquens, FR) | Alcatel (Paris, FR) | 23.03.1999 | 23.05.2000 | G01S13/00, G01S13/28, G01S7/40, G01S13/90, G01S007/40, G01S7/4052, G01S13/282, G01S13/90 | 09/274471 |
| 82 | 6055287 | Phase-comparator-less delay locked loop | A delay locked loop clock circuit employs an analog control loop for generating picosecond-accurate clock delays. A linear analog comparison circuit operating on integrated DC levels replaces the usual digital phase comparator for substantially improved timing accuracy. In operation, clock pulses from a first delay path are integrated and applied to a loop control amplifier. Clock pulses from a second delay path are integrated and applied to a differencing input of the loop control amplifier. The loop control amplifier regulates the delay in the second delay path to balance the integrated clock pulse voltages against externally applied control voltages. The delay between the first path and the second path is thereby precisely controlled by external voltage inputs. The first and second path clock output timing relationship is directly measured by analog voltage devices, eliminating error-prone high-speed phase comparators employed in prior art approaches | McEwan Thomas E. (Livermore, CA), Family ID | --- | 26.05.1998 | 25.04.2000 | G01S13/00, G01S13/18, G01S13/28, H03K5/15, H03L7/081, H03L7/08, H03L7/097, H03L007/06, H03K5/15006, H03L7/0812, H03L7/097, G01S13/18, G01S13/28 | 09/084541 |
| 83 | 6018698 | High-precision near-land aircraft navigation system | An aircraft including an approach and landing system, including a navigation unit for providing navigation information, a weather radar unit for providing radar information, a processor which receives navigation information from the navigation unit and information from the weather radar unit, the processor unit providing an output representing information concerning the aircraft in accordance with the provided navigation information and radar information, a memory for storing information representing a scene, the processor unit correlating the stored scene information with the output representing information concerning the aircraft to provide a mapped scene, a display unit for displaying the output of said processor and the mapped scene, and a steppable frequency oscillator for providing a signal which is stepped in frequency to the weather radar unit, thereby providing an increased range resolution | Nicosia Joseph M. (Carlsbad, CA), Loss Keith R. (Escondido, CA), Taylor Gordon A. (Escondido, CA) | Winged Systems Corporation (Dickinson, TX) | 23.06.1997 | 25.01.2000 | G01C23/00, G01C21/10, G01C21/16, G01S13/00, G01S13/91, G01S13/95, G01S13/90, G01S13/28, G01S7/02, G01S7/41, G05D1/06, G05D1/00, G08G5/00, G08G5/02, G01S13/86, G01S5/14, G01S013/08, G01C21/165, G01C23/005, G01S7/412, G01S13/286, G01S13/9035, G01S13/913, G01S13/953, G01S19/15, G05D1/0676, G08G5/0021, G08G5/0065, G08G5/0086, G08G5/0091, G08G5/025, G01S13/86, G01S13/90, G01S19/52 | 08/880362 |
| 84 | 5945926 | Radar based terrain and obstacle alerting function | A radar based terrain and obstacle detection device for aircraft detects obstacles and terrain ahead of the aircraft. An alert is sounded if the obstacle or terrain is above a clearance plane positioned ahead of the aircraft | Ammar Danny F. (Broward, FL), Spires Randall C. (Palm Beach, FL), Sweet Steven R. (Broward, FL) | AlliedSignal Inc. (Morristown, NJ) | 14.05.1997 | 31.08.1999 | F41G7/22, G01C21/00, F41G7/20, G01S13/95, G01S13/44, G01S13/00, G01S13/91, G01S7/285, G01S13/87, G01S13/02, G01S13/89, G01S13/93, G01S13/28, G01S13/94, G01S7/28, G01S7/41, G01S7/282, G01S7/02, G08B023/00, F41G7/2226, G01C21/005, G01S13/4418, G01S13/4427, G01S13/4463, G01S13/913, G01S13/953, G01S7/282, G01S7/285, G01S7/412, G01S13/28, G01S13/87, G01S13/89, G01S13/9303, G01S13/94, G01S2013/0263 | 08/856362 |
| 85 | 5943004 | Method for the transmission of radar transmitter pulses | The invention relates to a method for realizing a radar transmission for a high-resolution radar. According to the method, a number of groups of pulses is transmitted with incremental frequencies, each group also comprising a number of pulses with incremental frequencies, which pulses are transmitted simultaneously or substantially simultaneously | Groenenboom Albert (Hengelo, NL), Meijer Wietze Jan Hendrik (Enschede, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 12.12.1997 | 24.08.1999 | G01S13/24, G01S13/00, G01S13/28, G01S013/38, G01S13/24, G01S13/286 | 08/990090 |
| 86 | 5926125 | Synthetic aperture radar | A method of operating a SAR system comprised of emitting a sequence of pulses toward a target, alternating characteristics of pairs of successive pulses, receiving reflected pulses from the target, passing the received reflected pulses through a filter, modifying parameters of the filter in step with the transmitted pulses to match the characteristics of the successive pulses in the event a time delay between pulse transmission and reception of a pulse reflected from a target is a fraction greater than an even multiple of a pulse period, and modifying the parameters of the filter in anti-synchronism with the successive pulses in the event a time delay between pulse transmission and reception of a pulse reflected from a target is less than a fraction greater than an even multiple of a pulse period | Wood Peter John (Nepean, CA) | EMS Technologies Canada, Ltd. (Ottawa, CA) | 06.02.1998 | 20.07.1999 | G01S13/90, G01S13/10, G01S13/28, G01S13/00, G01S7/285, G01S013/90, G01S13/106, G01S13/28, G01S13/9035, G01S7/285 | 09/020240 |
| 87 | 5910785 | Method for the processing of the reception signal of a synthetic aperture radar with frequency ramps | A Deramp type radar used in synthetic aperture radar for radar imaging transmits coherently repeated linear frequency-modulated pulses and carries out a sort of pulse compression in reception by demodulation of the echo signals received by means of a frequency ramp that reproduces all or part of a transmitted pulse, and by a Fourier transform performed in range. With this type of pulse compression, a parasitic phase modulation appears on the signal delivered by a Deramp type radar. This parasitic phase modulation disturbs the standard SAR procession operations for the construction of radar images. The proposed method is used to eliminate the detrimental effects of this parasitic phase modulation on the construction of a radar image. It consists of the adoption of a particular temporal support for the demodulation and of the correction of the parasitic phase modulation that appears with this particular temporal supports chiefly by a phase correction in the pulse response of the image focusing filter and, secondarily, by a another phase correction in the complex reflection coefficients obtained for the points of the image at the end of the SAR processing. FIG. 7 | Normant Eric (Montigny le Bretonneux, FR) | Thomson-CSF (Paris, FR) | 30.04.1998 | 08.06.1999 | G01S13/90, G01S13/00, G01S13/28, G01S013/00, G01S13/90, G01S13/282 | 09/069989 |
| 88 | 5870054 | Moving target indicator with no blind speeds | A moving target indicating system wherein a pulse source which generates radiofrequency drive pulses at a predetermined pulse repetition frequency is connected to the inputs of a pair of channels. The first channel includes a phase-dispersive filter having a first phase-slope dispersion characteristic, while the second channel has a phase-dispersive filter having a phase-slope dispersion characteristic which is the negative of that of the first filter. A pulse group comprising the output of the first and the second channels is transmitted periodically as each drive pulse is applied. The pulse repetition frequency is sufficiently low that when transmitted, echos of only one pulse of each group are received at a time. Due to the "matched" or "conjugate" phase-dispersive characteristics of the filters in the respective channels, the first channel operates in reception upon the reflected pulse originally generated in the second channel and compresses it thus resynthesizing or reconstituting a short duration pulse like the original, while the second channel operates in reception upon the reflected pulse generated in the first channel, compressing it to reconstitute a short duration pulse like the original. A canceler is switched between the outputs of the first and second channels to receive the two resulting reconstituted pulses of each group. In the usual application, fixed target information is cancelled out and moving target information is derived for application to a display device | Lewis Bernard L. (Fort Washington, MD), Family ID | --- | 10.12.1982 | 09.02.1999 | G01S13/524, G01S13/28, G01S13/00, G01S013/528, G01S13/282, G01S13/524 | 06/458006 |
| 89 | 5852418 | Notched-spectrum swept-frequency generator and method therefor | A notched-chirp generator (20), utilizing first and second chirp generators (28, 30), a functional conversion element (40), an antichirp generator (42), a summing element (64), and a translation element (66), generates a notched-chirp signal (24). The second chirp generator (30) generates a second chirp phase signal (.phi..sub.C1), is translated by the functional conversion element (40) into an oscillating antichirp signal (A.sub.O1). The antichirp generator (42) generates an antichirp signal (A.sub.1) by scaling, weighting, and cyclically positioning the oscillating antichirp signal (A.sub.O1). The summing element (64) sums the antichirp signal (A.sub.1) with a first chirp phase signal (.phi..sub.C0), generated by the first chirp generator (28), to produce a notched-chirp phase signal (.phi..sub.N), which is converted by the translation element (66) into a notched-chirp signal (24) having a notch (26) positioned at a specific frequency (f.sub.N) determined by the antichirp signal (A.sub.1) | Ferrell Bruce H. (Tempe, AZ), Woody William C. (Phoenix, AZ) | Lockheed Martin Corporation (Goodyear, AZ) | 12.11.1997 | 22.12.1998 | G01S13/00, G01S13/28, H03B23/00, G01S13/90, G01S007/28, G01S13/282, H03B23/00, G01S13/90 | 08/967840 |
| 90 | 5831570 | Radar resolution using monopulse beam sharpening | A method and apparatus for improving resolution of targets in a monopulse radar beam | Ammar Danny F. (Broward, FL), Spires Randall C. (Palm Beach, FL), Sweet Steven R. (Broward, FL) | AlliedSignal, Inc. (Morristown, NJ) | 15.09.1997 | 03.11.1998 | G01S13/95, F41G7/22, G01S13/00, G01C21/00, F41G7/20, G01S13/44, G01S13/91, G01S7/285, G01S13/87, G01S13/02, G01S13/89, G01S13/93, G01S13/28, G01S13/94, G01S7/28, G01S7/41, G01S7/282, G01S7/02, G01S013/95, G01S013/44, F41G7/2226, G01C21/005, G01S13/4418, G01S13/4427, G01S13/4463, G01S13/913, G01S13/953, G01S7/282, G01S7/285, G01S7/412, G01S13/28, G01S13/87, G01S13/89, G01S13/9303, G01S13/94, G01S2013/0263 | 08/929732 |
| 91 | 5818384 | Apparatus for and method of controlling and calibrating the phase of a coherent signal | The apparatus for and method of generating a coherent signal whose amplit, frequency and phase can be accurately controlled. A first and second signal are synthesized digitally in response to separate frequency and phase input data. The second synthesized signal is heterodyned with a coherent oscillator signal. This heterodyned signal, in turn, is heterodyned with the first synthesized signal to produce a coherent signal generator output. The amplitude of the generator output signal may be varied in accordance with attenuation input data. A phase modulator provides phase shift key modulation of the output signal in accordance with a phase control signal. In addition, a switch gates the output of the final mixer under control of a switch control circuit which determines the pulse width and timing of the signal generator output | Nishri Ezra (Misgav, IL) | State of Israel-Ministry of Defense Armament Development Authority-Rafael (Haifa, IL) | 29.01.1997 | 06.10.1998 | G01S7/28, G01S7/282, G01S13/00, G01S13/28, G01R31/28, H03L007/07, H03B021/00, G01S7/282, G01R31/2839, G01R31/2848, G01S13/286, G01S13/288 | 08/776631 |
| 92 | 5815111 | Method of reducing ambiguities in synthetic aperture radar, and radar implementing the method | A method of defocusing range ambiguities in a pulse radar, in particular of the SAR type, the method comprising the following steps: radar pulses are spread on transmission by using a plurality of "chirp" rules for varying the frequency of the transmitted wave as a function of time: during transmission of successive pulses, chirp rules are alternated between chirps that rise and chirps that fall in the frequency/time plane of the pulse: received echoes are compressed by matched filtering using a correlation operation between the received echo signal and the chirp rule that was applied at the time of transmission of the pulse that gave rise to said echo signal: said method being characterized in that said plurality of rules for varying the frequency of the transmitted wave as a function of time comprise a number M of said rules, with M being an integer greater than or equal to 3 | Gouenard Sophie (Toulouse, FR), Suinot Noel (Escalquens, FR) | Alcatel Espace (Nanterre Cedex, FR) | 14.06.1996 | 29.09.1998 | G01S13/90, G01S13/28, G01S13/00, G01S7/36, G01S013/00, G01S13/282, G01S13/90, G01S7/36 | 08/664174 |
| 93 | 5805107 | Cost-effective method for determining a pulse response of a high-resolution, band-limited radar channel | For less expensive estimation the impulse response x.sub.MOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received signal e, over which a correlated or uncorrelated additive interference signal n can be superimposed, with the use of knowledge about the spread code c and the use of a channel estimator with which a so-called linear, optimum unbiased estimation of the radar channel impulse response x.sub.MOS is performed in a time range covering M range gates of interest, the linear, optimum estimation in the unbiased channel estimator is modified in such a way that the pulse response x.sub.MOS of the band-limited radar channel is determined according to the basic principle of a multiplication of the sampled received signal e and an inverse estimation matrix A.sub.E.sup.-1. The matrix A.sub.E is formed by the extension of the rectangular matrix represented by the components c.sub.i of the spread code c to form a quadratic matrix that circulates to the right, that is, the modified, optimum unbiased estimation: applies for a radar channel | Schroth Arno (Puchheim, DE), Felhauer Tobias (Neu-Ulm, DE), Baier Walter (Kaiserslautern, DE) | Deutsche Forschungsanstalt fur Luft-Und Raumfahrt e.V. (Koln, DE) | 18.04.1997 | 08.09.1998 | G01S13/28, G01S13/00, G01S7/40, G01S13/93, G01S13/87, G01S7/41, G01S7/02, G01S007/292, G01S7/40, G01S13/284, G01S7/41, G01S13/003, G01S13/87, G01S2013/9335 | 08/837602 |
| 94 | 5798729 | Radar apparatus | A radar apparatus provided with a transmitting unit, antenna unit and a receiver unit. The transmitting unit transmits pulses having a modulation for enabling pulse compression on reception. As an ECCM feature, the radar apparatus is further provided with a blanking circuit. The blanking circuit includes two filters, one filter being responsive to the first half of the transmitting pulse only and the other filter being responsive to the second half of the transmitting pulse only. Blanking occurs if both filters simultaneously produce an output | Scholz John Arthur (Hengelo, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 10.02.1997 | 25.08.1998 | G01S7/36, G01S13/28, G01S13/00, G01S013/53, G01S007/292, G01S7/36, G01S13/28 | 08/776699 |
| 95 | 5793798 | Virtual beam system | A virtual beam system operating in an environment, including a non-compatible receiver, includes a transmitting subsystem and a receiving subsystem. The transmitting subsystem includes an array of transmitting elements and an element position encoded composite signal generator for generating an element position encoded composite signal. The array of transmitting elements is operatively coupled to the signal generator. The transmitting subsystem radiates the element position encoded composite signal via the array of transmitting elements. The receiving subsystem is responsive to the element position encoded composite signal and includes a receiving element and an element position encoded composite signal decoder for decoding the element position encoded composite signal. The receiving element is operatively coupled to the signal decoder. The element position encoded composite signal appears to be radiated as a wide beam, with relatively low directive gain, when received and decoded by the non-compatible receiver. Conversely, the element position encoded composite signal appears to be radiated as a narrow beam, with relatively high directive gain, when received by the receiving element and decoded by the signal decoder of the receiving subsystem | Rudish Ronald (Commack, NY), Levy Joseph (Merrick, NY) | AIL Systems, Inc. (Deer Park, NY) | 18.12.1995 | 11.08.1998 | G01S13/32, G01S13/00, H01Q3/26, H01Q3/30, H04B1/69, H04B7/08, H04B7/04, G01S13/02, G01S13/28, H04B001/707, H04B001/713, G01S7/023, G01S13/325, H01Q3/26, H01Q3/2605, H01Q3/30, H04B1/69, H04B7/0408, H04B7/086, G01S13/288, G01S2013/0281 | 08/573946 |
| 96 | 5790475 | Process and apparatus for improved interference suppression in echo-location and imaging systems | In echo-location and imaging systems, interference suppression is accomplished by shaping the transmitted signal waveform. Interference suppression permits more accurate range estimates or image formation, respectively. These specially shaped waveforms can also be used in communication systems to secure more accurate message transmission in the presence of interference. Shaping of the transmitted signal may be accomplished in two ways:(1) by convolving an elemental waveform with a multi-level pseudorandom sequence (i.e., binary, ternary, Poisson, etc.): or (2) by transforming nonlinearly the amplitude of the elemental waveform to give it high skewness. Interference suppression in the former case is achieved through matched filtering (replica correlation or pulse compression), and in the latter case it is accomplished by bispectrum-bicoherence processing | Marmarelis Vasilis Z. (Irvine, CA), Nikias Chrysostomos L. (Rancho Palos Verdes, CA), Sheby David (Cherry Hill, NJ) | Multispec Corporation (Huntington Beach, CA) | 28.10.1996 | 04.08.1998 | G01S13/00, G01S13/28, G01S7/288, G01S7/292, G01S7/285, G01S015/00, G01S13/284, G01S7/2921, G01S2007/2883 | 08/738874 |
| 97 | 5786788 | Radar system and method for reducing range sidelobes | A system (10) for reducing range sidelobes adapted for use with pulsed radar systems. The inventive system (10) includes a mismatched filter (90) for correlating a received signal (84) with a correlator signal (92) having a different length than the transmit signal (84) and for providing a predetermined number of reduced range sidelobes (97) at the output of the mismatched filter (90). The mismatched filter (90) has a first locally optimum sequence that is the correlator signal (92). The mismatched filter (90) has an input device (86) for receiving an extended locally optimum sequence (84) that is a received signal (84). The first locally optimum sequence (92) is a sub-sequence of the extended locally optimum sequence (84). In a specific embodiment the mismatched filter (90) has a Barker-based code that is the correlator signal (92). The mismatched filter (90) has an input device (86) for receiving an extended Barker-based code that is a received signal (84). The extended Barker-based code (84) includes the Barker-based code (92) as a sub-sequence | Schober Michael B. (Tucson, AZ), Davila Carlos A. (Tucson, AZ) | Raytheon Company (Los Angeles, CA) | 08.10.1996 | 28.07.1998 | G01S13/00, G01S13/28, G01S7/288, G01S7/285, G01S007/292, G01S13/288, G01S7/288 | 08/727108 |
| 98 | 5777574 | High resolution imaging radar linear frequency modulation bandwidth multiplier | An apparatus and method of linear frequency modulation waveform bandwidth multiplication including a digital linear frequency modulation waveform synthesizer for generating a synthesized waveform having an upchirp component of linearly varying frequency during a first half signal duration of the synthesized waveform followed by a downchirp component having linearly varying frequency during a second half of the signal duration of the synthesized waveform. The synthesized waveform is upconverted and subsequently bandpass filtered to provide a filtered waveform to a mixer for mixing with local oscillation signals. The upchirp and downchirp components of the filtered waveform are respectively mixed by first and second local oscillation signals having respective first and second oscillation frequencies in the mixer. The local oscillation signal frequencies have a predetermined relationship to ensure that the signal components of the output signal corresponding to the upchirp and downchirp components transition smoothly. The corresponding linear frequency modulation bandwidth multiplied signal has decreased nonlinearities | Robinson John P. (Newton, CT) | Northrop Grumman Corporation (Los Angeles, CA) | 18.12.1996 | 07.07.1998 | G01S13/90, G01S13/00, G01S7/28, G01S7/282, H03B21/02, H03B21/00, H03B23/00, G01S13/28, H03B28/00, G01S013/90, G01S007/282, G01S7/282, G01S13/90, H03B21/02, H03B23/00, G01S13/282, H03B28/00, H03B2200/0092 | 08/769091 |
| 99 | 5768131 | Computerised radar process for measuring distances and relative speeds between a vehicle and obstacles located in front of it | A vehicle radar emits four groups of single-frequency stepped radar pulses. In group A, the frequency of each pulse is a fixed amount higher than that of the preceding pulse. In group B, the frequency of each pulse is a fixed amount lower than that of the preceding pulse. In group C, the frequency of each pulse is the same as that of the preceding pulse. In group D, the frequency of each pulse depends on a modulo algorithm. The signals reflected from other vehicles may readily be processed with inexpensive equipment to discriminate among such other vehicles, and to determine the distance to, and relative speed of, each such vehicle | Lissel Ernst (D-38442 Wolfsburg, DE), Rohling Hermann (D-38304 Wolfenbuttel, DE), Plagge Wilfried (D-38312 Ohrum, DE), Family ID | --- | 10.10.1995 | 16.06.1998 | G01S13/93, G01S13/34, G01S13/00, G01S13/28, G01S13/72, G01S13/58, G01S7/288, G01S7/285, G01S013/00, G01S7/038, G01S13/286, G01S13/34, G01S13/584, G01S13/931, G01S13/345, G01S13/346, G01S13/726, G01S2007/2886 | 08/492079 |
| 100 | 5760732 | Method and apparatus for enhanced resolution of range estimates in echo location for detection and imaging systems | A method and apparatus for enhancing resolution of range estimates in all echo location systems and, specifically, such systems as Radar, Sonar, and Synthetic Aperture Radar (SAR), for example. The invention utilizes high processing system ambiguity function and suppress its side lobes, for a given transmission pulse bandwidth. The method and apparatus may be implemented in the frequency domain or time domain. Enhanced resolution is achieved by using a filter (MSC filter), according to this invention, in the echo location data processing system so that the received echo data is processed by the MSC filter to produce a signal that exhibits enhanced range resolution. The MSC filter output, H(.omega.), which is specific to of the transmitted signal with its modified spectral profile | Marmarelis Vasilis Z. (Irville, CA), Nikias Chrysostomos L. (Ranch Palos Verdes, CA), Sheby David (Cherry Hill, NJ) | Multispec Corporation (Huntington Beach, CA) | 01.05.1996 | 02.06.1998 | G01S7/32, G01S13/00, G01S13/90, G01S7/285, G01S13/28, G01S7/288, G01S013/06, G01S7/32, G01S13/9035, G01S13/282, G01S13/9011, G01S13/9017, G01S2007/2883 | 08/641346 |
| 101 | 5757848 | Method and apparatus for a decimating digital PN correlator | A decimating digital PN receiver (10) processes a target return signal. The target return signal is decimated (34) processed at a slower speed. The decimated target return signal is then digitally correlated (28). The correlated signal is digitally filtered (30) and a fast Fourier transform (32) is applied to produce the output (33) | Hogberg Shawn Wesley (Chandler, AZ) | Motorola, Inc. (Schaumburg, IL) | 30.11.1995 | 26.05.1998 | G01S13/00, G01S13/28, G01S7/288, G01S7/285, H04B1/707, H04B015/00, H04K001/00, H04L027/30, G01S7/288, G01S13/288, H04B1/707, H04B1/709 | 08/565125 |
| 102 | 5726657 | Phase coherent radar system using fast frequency agile waveform synthesis | A radar system in which a frequency agile synthesizer is used to provide rapid frequency shifts and in which measures are taken to maintain phase coherency. The system is fully coherent such that all signals are derived from a common source and are capable of high pulse repetition rates in excess of 1 MHz. There are no inherent transmit duty cycle restrictions and the system is able to transmit complex phase and frequency modulated waveforms. A frequency interleaving scheme is used to resolve range ambiguities at high pulse repetition frequencies and the use of a complementary phase coding scheme allows a high range resolution processing with the transmitted waveforms | Pergande Albert N. (Orlando, FL), O'Donnell Daniel J. (Orlando, FL), Sabin Albert S. (Orlando, FL) | Lockheed Martin Corporation (Bethesda, MD) | 22.03.1996 | 10.03.1998 | G01S13/00, G01S13/24, G01S13/28, G01S13/44, G01S7/288, G01S7/285, G01S7/02, G01S007/292, G01S013/72, G01S13/24, G01S13/288, G01S7/288, G01S13/44, G01S2007/2883 | 08/620363 |
| 103 | 5724041 | Spread spectrum radar device using pseudorandom noise signal for detection of an object | A radar device transmits by a transmitting part a wave whose band is spread by a PN code from a PN generator, receives at a receiving part a reflected wave from an object based on the wave and detects the object by detecting correlation between the received signal and the PN code. In this radar device, the received signal which is spread to a wide range is converted to a low-frequency band which is easy to be measured by a down converter so that a signal is generated when correlation is made by a delay of the PN code from a delay circuit, and generates a pulse signal through waveform shaping of the signal to detect the object and to measure its relative speed and distance at a processing part according to the pulse signal and the delay time | Inoue Kiyoshi (Atsugi, JP), Ishizu Haruhiko (Atsugi, JP), Kohno Ryuji (Yokohama, JP) | The Furukawa Electric Co., Ltd. (Tokyo, JP) | 22.11.1995 | 03.03.1998 | G01S13/00, G01S13/58, G01S13/93, G01S13/34, G01S7/285, G01S13/28, G01S7/02, G01S013/93, G01S7/285, G01S13/346, G01S13/584, G01S13/931, G01S13/284 | 08/561985 |
| 104 | 5719580 | Method and apparatus for digital compensation of VCO nonlinearity in a radar system | An apparatus for correcting for nonlinearities in modulation systems includes a transmitter (24, 28, 48, 50, 52) for transmitting a time varying modulated radar signal (56). A receiver (58, 62) receives an echo signal (60) resulting from reflection of the transmitted modulated signal (56). A mixer (48) compares the transmitted signal against the echo signal and providing a comparison signal indicative of the comparison. The comparison signal is sampled by an A/D converter (74). The A/D convertor (74) provides a sampled comparison signal to a controller/DSP (22). Controller/DSP (22) resamples the sampled comparison signal at selected resample times and effectively varies the selected resample times to correct for nonlinearities in the comparison signal resulting from nonlinearities of the transmitted time varying modulated signal | Core Mark Taylor (Placentia, CA) | TRW Inc. (Lyndhurst, OH) | 06.06.1996 | 17.02.1998 | G01S7/40, G01S13/00, G01S13/93, G01S13/34, G01S13/28, G01S013/00, G01S7/4008, G01S13/282, G01S13/343, G01S2013/9375 | 08/659400 |
| 105 | 5659320 | Method and device for determining the speed of a moving object by means of a pulse-compression radar or sonar | A method and device of the pulse-compression radar or sonar type which makes it possible to determine the speed of a moving object is provided with a transmitter system, a receiver system, and a signal processing system. The transmitter system is capable of transmitting two associated pulses, one of which is modulated with an increasing variation law and the other of which is modulated with a decreasing variation law. The signal processing system includes two correlators, an adder, a subtractor, and a computer | Pouit Christian (Rueil Malmaison, FR) | Societe Nationale Industrielle Aerospatiale (Paris, FR) | 21.11.1995 | 19.08.1997 | G01S13/58, G01S13/00, G01S13/28, G01S013/536, G01S13/282, G01S13/582 | 08/560274 |
| 106 | 5657022 | Unambiguous range-doppler processing method and system | Range-Doppler ambiguity is eliminated from an ultra-wideband radar system by transmitting an ultra-wideband chirped pulse towards a moving target, and mixing it with the doppler-shifted chirped pulse which is received as a target echo return signal. Multioctave radar tracing systems can potentiality track stealth aircraft without ambiguity since pulses containing many frequencies can defeat narrow-band radar absorbing material coatings. The unambiguous range-doppler signal processing method mixes the chirped pulse to yield an instantaneous Doppler frequency (which indicates target velocity) and a rate of change in the instantaneous Doppler frequency (which indicates target acceleration) | Van Etten Paul (Clinton, NY), Wicks Michael C. (Utica, NY) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 17.11.1992 | 12.08.1997 | G01S13/58, G01S13/02, G01S13/00, G01S13/28, G01S13/30, G01S013/50, G01S13/0209, G01S13/282, G01S13/582, G01S13/30 | 07/985071 |
| 107 | 5654890 | High resolution autonomous precision approach and landing system | An aircraft including an approach and landing system, including a navigation unit for providing navigation information, a weather radar unit for providing radar information, a processor which receives navigation information from the navigation unit and information from the weather radar unit, the processor unit providing an output representing information concerning the aircraft in accordance with the provided navigation information and radar information, a memory for storing information representing a scene, the processor unit correlating the stored scene information with the output representing information concerning the aircraft to provide a mapped scene, a display unit for displaying the output of said processor and the mapped scene, and a steppable frequency oscillator for providing a signal which is stepped in frequency to the weather radar unit, thereby providing an increased range resolution | Nicosia Joseph M. (Carlsbad, CA), Loss Keith R. (Escondido, CA), Taylor Gordon A. (Escondido, CA) | Lockheed Martin (Bethesda, MD) | 31.05.1994 | 05.08.1997 | G01C23/00, G01C21/10, G01C21/16, G01S7/02, G01S13/00, G01S13/90, G01S13/91, G01S13/28, G01S13/95, G01S7/41, G05D1/00, G05D1/06, G08G5/02, G08G5/00, G01S13/86, G01S5/14, G01S013/02, G01C21/165, G01C23/005, G01S7/412, G01S13/286, G01S13/9035, G01S13/913, G01S13/953, G01S19/15, G05D1/0676, G08G5/0021, G08G5/0065, G08G5/0086, G08G5/0091, G08G5/025, G01S13/86, G01S13/90, G01S19/52 | 08/251451 |
| 108 | 5646627 | Method and apparatus for controlling a biphase modulation to improve autocorrelation in pseudorandom noise coded systems | This invention relates to a method and apparatus for controlling a biphase modulator (602, 702) to improve autocorrelation in pseudorandom noise coded systems. The biphase modulator modulates a carrier frequency with one of two phase states responsive to a pseudorandom noise (PN) binary code sequence. The spectrum (610, 710) at the output of the biphase modulator comprises a plurality of spectral lines separated by the code repetition frequency, including a center spectral line (611, 711) and at least one adjacent spectral line (612-615, 712-717). The magnitude of the center spectral line is measured and compared to a reference to produce a control signal which is responsive to the magnitude of the center spectral line. This control signal is supplied to the biphase modulator for maintaining a predetermined magnitude of the center spectral line thereby achieving a desired spectrum output and improving autocorrelation of the system | Willis Carl Myron (Mesa, AZ), Koehler Thomas Frederick (Scottsdale, AZ) | Motorola, Inc. (Schaumburg, IL) | 30.01.1996 | 08.07.1997 | G01S13/32, G01S13/00, G01S7/28, G01S7/282, H04B1/707, G01S13/28, G01S007/28, G01S7/282, G01S13/325, H04B1/707, G01S13/288 | 08/593962 |
| 109 | 5646623 | Coherent, frequency multiplexed radar | Coherent, frequency multiplexed radar is a new generic type of continuous wave radar architecture wherein contiguous pulses of discrete frequency segmented signals are serially transmitted from an antenna, and after reflection from radar targets, signals from the same antenna are coherently processed in a parallel manner to provide correlated measurements of target's pulse compressed range and radial velocity. Simultaneously transmitted and received signals are separated by frequency multiplexing | Walters Glenn A. (Escondido, CA), Teschmacher Lance M. (Del Mar, CA), Family ID | --- | 24.11.1981 | 08.07.1997 | G01S13/32, G01S13/00, G01S7/03, G01S13/28, G01S013/536, G01S13/32, G01S7/038, G01S13/286 | 06/324677 |
| 110 | 5608404 | Imaging synthetic aperture radar | A linear-FM SAR imaging radar method and apparatus to produce a real-time image by first arranging the returned signals into a plurality of subaperture arrays, the columns of each subaperture array having samples of dechirped baseband pulses, and further including a processing of each subaperture array to obtain coarse-resolution in azimuth, then fine-resolution in range, and lastly, to combine the processed subapertures to obtain the final fine-resolution in azimuth. Greater efficiency is achieved because both the transmitted signal and a local oscillator signal mixed with the returned signal can be varied on a pulse-to-pulse basis as a function of radar motion. Moreover, a novel circuit can adjust the sampling location and the A/D sample rate of the combined dechirped baseband signal which greatly reduces processing time and hardware. The processing steps include implementing a window function, stabilizing either a central reference point and/or all other points of a subaperture with respect to doppler frequency and/or range as a function of radar motion, sorting and compressing the signals using a standard fourier transforms. The stabilization of each processing part is accomplished with vector multiplication using waveforms generated as a function of radar motion wherein these waveforms may be synthesized in integrated circuits. Stabilization of range migration as a function of doppler frequency by simple vector multiplication is a particularly useful feature of the invention: as is stabilization of azimuth migration by correcting for spatially varying phase errors prior to the application of an autofocus process | Burns Bryan L. (Tijeras, NM), Cordaro J. Thomas (Albuquerque, NM) | The United States of America as represented by the United States (Washington, DC) | 23.06.1993 | 04.03.1997 | G01S13/90, G01S13/00, G01S13/28, G01S7/288, G01S7/285, G01S013/90, G01S13/90, G01S13/28, G01S13/9023, G01S2007/2883, G01S2013/9041 | 08/081462 |
| 111 | 5598165 | Method for the control of a radar station | A method of controlling the transmission of a number of radio-frequency pulses having different frequencies in a radar device. The time interval between two consecutively transmitted pulses is determined by a pulse repetition frequency. The total number of radio-frequency pulses is distributed between at least two groups, each group comprising a number of pulses having different frequencies. Each group is repeatedly transmitted a number of times in succession. The time interval between two transmitted pulses having the same frequency in a group is determined by the number of pulses having different frequencies in the group | Winberg H. P. Erik (Molnlycke, SE), Jonsson S. Roland (Goteborg, SE) | Telefonaktiebolaget LM Ericsson (Stockholm, SE) | 03.10.1995 | 28.01.1997 | G01S13/00, G01S13/24, G01S13/28, G01S013/24, G01S13/24, G01S13/282, G01S13/286, G01S13/288 | 08/538342 |
| 112 | 5568150 | Method and apparatus for hybrid analog-digital pulse compression | A method and apparatus for hybrid analog-digital pulse compression, as well as, a method of use and manufacture includes an analog intermediate frequency filter, a converter, and a digital correlator. The analog intermediate frequency filter filters and weights returned echo signals, and the digital correlator compresses the filtered and weighted echo signals. The frequency or impulse response of the digital correlator is set based on the frequency or impulse response of the analog intermediate frequency filter to obtain a pulse compressor with minimal mismatch loss and improved sidelobe suppression. The invention provides for the lowest possible sampling rate of analog-to-digital convertors used with the apparatus: thus, minimizing the cost of this device and all subsequent digital processing | Taylor, Jr. John W. (Baltimore, MD), Blinchikoff Herman J. (Baltimore, MD), Martineau Micheal J. (Ellicott City, MD), Hyer Scott A. (Columbia, MD) | Northrop Grumman Corporation (Los Angeles, CA) | 31.07.1995 | 22.10.1996 | G01S13/00, G01S13/28, G01S7/288, G01S7/28, G01S7/292, G01S7/282, G01S7/285, G01S007/292, G01S13/282, G01S7/282, G01S7/292, G01S2007/2883, G01S2007/2886 | 08/509625 |
| 113 | 5557560 | Apparatus and method for pulse compression and pulse generation | A circuit and method for compressing or generating a pulse, particularly a chirp pulse, which uses infinite impulse response filtering (3.2). The infinite impulse response filters (3.9, 3.10, 3.11, 3.12) simulate the responses of finite impulse response filters. This is achieved by pre-processing the signal by passing it through a pre-processing filter (3.3) which has zero response at the resonant frequencies of the infinite impulse response filters (3.9, 3.10, 3.11, 3.12). The pre-processing and infinite impulse response filtering may be incorporated into a matched filter for detection of a chirp waveform input signal. This can be implemented in the time domain or the frequency domain. The matched filter also can incorporate beating to the base band techniques. The matched filter can also act as a generator by applying a pulse to the input which has the unit impulse function causing a chirp signal, equivalent to the transfer function of the filter, to be produced as the output | Dix John (Portland, GB), Smith Roderick A. (Weymouth, GB) | The Secretary of State for Defence in Her Britannic Majesty's Government (London, GB2) | 24.05.1994 | 17.09.1996 | G01S13/00, G01S13/28, H03H17/06, H03B23/00, G06J001/00, G06F015/31, G01S13/282, H03B23/00, H03H17/06 | 08/244243 |
| 114 | 5552793 | Self calibrated act pulse compression system | A self-calibrating pulse compression system which is able to optimally compress a chirped waveform notwithstanding variations in the chirped spectrum due to changes in transmitter characteristics or other factors. In a most general sense, the inventive pulse compression system includes a first circuit (12, 14) for providing a first waveform, a second circuit (16, 30, 32) for sampling the first waveform at predetermined time intervals to provide a plurality of calibration samples, a third circuit (30) for storing the calibration samples: and fourth circuit (16, 28, 30) for multiplying a second waveform by the stored calibration samples. In a specific implementation, the first circuit of the self-calibrating pulse compression system includes an impatt chirp transmitter (12). The output of the transmitter (12) is fed to an antenna (18) and to a first switch (22) by a circulator (20). The switch (22) is controlled by a timing circuit (16) which may be implemented with software in a host computer. The output signal of switch (22) is downconverted and input to a tapped delay line (28). In the best mode, the tapped delay line is implemented with an acoustic charge transport device (ACT). The ACT has a programmable multiplier on each tap. In a calibration mode, the output of the transmitter is input into the delay line and the taps are sampled to provide a plurality of calibration samples which are stored in random access memory. In operation, the calibration samples are used to program the tap multipliers. When the transmitted waveforms are received, the waveforms are stored in the tapped delay line and multiplied by the tap weights to provide a compressed pulse | McLeod Scott C. (Tucson, AZ), Zerkowitz Avinoam S. (West Hills, CA), Lent Lillian G. (Gilbert, AZ) | Hughes Missile Systems Company (Los Angeles, CA) | 02.12.1994 | 03.09.1996 | G01S13/00, G01S13/28, G01S7/40, G01S007/28, G01S7/4008, G01S13/282 | 08/348417 |
| 115 | 5546089 | Optical monopulse chirp processor | An optical chirp processor for the collection and processing clutter samples is presented that allows the simultaneous estimation of both the clutter mean and variance. The estimated clutter mean and variance allow the actual calculation of both clutter model parameters using a power spectrum analyzer, and a CFAR special purpose processor unit. The power spectrum analyzer is composed of:a spatial frequency demultiplexor, and a four element photodetector array. The special purpose processor is composed of:an A/D converter, a square root calculator, an averaging calculator, a combiner unit, a parameter memory unit, and a threshold calculator unit. The components of the CFAR processor may be implemented in a conventional CFAR processor (when modified by the teachings of the present invention) or in individual electronics components | Talbot Pierre J. (Alder Creek, NY) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 10.08.1995 | 13.08.1996 | G01S13/524, G01S13/00, G01S7/292, G01S13/44, G01S13/28, G01S007/292, G01S007/34, G01S7/2927, G01S13/5246, G01S13/282, G01S13/44, G01S13/5244 | 08/513369 |
| 116 | 5530448 | Three-pulse MTI without blind speeds | An MTI with no blind speeds which compensates for antenna scan modulation. his design includes circuitry for generating and transmitting consecutive first, second and third doppler-tolerant FM pulses, wherein the first and third FM pulses have a given dispersion characteristic, and the second FM pulse has a dispersion characteristic which is the complex conjugate of the first and third FM pulses. Circuitry is then provided for receiving and compressing the first, second, and third echos from the first, second, and third pulses, respectively. Finally, a processing circuit is used to effectively add the first and third echo pulses and to subtract twice the second echo pulse from this sum to effect the detection of the moving target | Lewis Bernard L. (Ft. Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 05.12.1983 | 25.06.1996 | G01S13/528, G01S13/30, G01S13/00, G01S13/28, G01S13/10, G01S013/28, G01S013/524, G01S13/282, G01S13/30, G01S13/528, G01S13/103 | 06/559062 |
| 117 | 5525990 | Coherent antenna sidelobe suppression system | A sidelobe suppression system including an antenna with a variable phase ter, a transmitter for transmitting an expanded phase-coded pulse, a receiver for receiving target echos, a pulse expander/compressor for phase coding the expanded transmitted pulse with a phase code, P, and for compressing target echos with unscrambled phase code P and a control unit for shifting the phase center of the antenna to scramble the phase codes of the expanded pulses transmitted into the antenna sidelobes | Lewis Bernard L. (Ft. Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 17.03.1983 | 11.06.1996 | G01S13/00, G01S13/28, G01S7/28, G01S013/00, G01S7/2813, G01S13/288 | 06/477480 |
| 118 | 5499029 | Wide band stepped frequency ground penetrating radar | A wide band ground penetrating radar system (10) embodying a method wherein a series of radio frequency signals (60) is produced by a single radio frequency source (16) and provided to a transmit antenna (26) for transmission to a target (54) and reflection therefrom to a receive antenna (28). A phase modulator (18) modulates those portion of the radio frequency signals (62) to be transmitted and the reflected modulated signal (62) is combined in a mixer (34) with the original radio frequency signal (60) to produce a resultant signal (53) which is demodulated to produce a series of direct current voltage signals (66) the envelope of which forms a cosine wave shaped plot (68) which is processed by a Fast Fourier Transform unit 44 into frequency domain data (70) wherein the position of a preponderant frequency is indicative of distance to the target (54) and magnitude is indicative of the signature of the target (54) | Bashforth Michael B. (Buellton, CA), Gardner Duane (Santa Maria, CA), Patrick Douglas (Santa Maria, CA), Lewallen Tricia A. (Ventura, CA), Nammath Sharyn R. (Santa Barbara, CA), Painter Kelly D. (Goleta, CA), Vadnais Kenneth G. (Alexandria, VA) | EG&G Energy Measurements, Inc. (Las Vegas, NV) | 28.04.1994 | 12.03.1996 | G01S13/28, G01S13/32, G01S13/34, G01S13/02, G01S13/00, H01Q21/00, H01Q9/27, H01Q9/04, G01S13/88, G01S013/24, G01S013/04, G01S13/0209, G01S13/286, G01S13/32, G01S13/347, H01Q9/27, H01Q21/0025, G01S13/885 | 08/234441 |
| 119 | 5495500 | Homodyne radio architecture for direct sequence spread spectrum data reception | A homodyne radio system for receiving direct sequence spread spectrum communications enables a received signal to be down-converted directly to a baseband signal. An input RF amplifier receives and amplifies a carrier signal modulated by a digital code sequence. A local oscillator provides a signal having a frequency substantially equal to the frequency of the carrier signal. A phase splitter coupled to the input RF amplifier receives the modulated carrier signal, and splits the signal into corresponding quadrature component signals. The mixer combines a first one of the quadrature component signals with the local oscillator signal to generate a first quadrature baseband output signal. A second one of the quadrature component signals is combined with the local oscillator signal shifted in phase by 90.degree. to generate a second quadrature baseband output signal. A transmitted signal can be generated by mixing quadrature baseband input signals with the same local oscillator and phase shifted local oscillator signals | Jovanovich Alan F. (Des Moines, WA), Warren Bruce G. (Poulsbo, WA) | Intermec Corporation (Everett, WA) | 09.08.1994 | 27.02.1996 | G01S13/00, G01S13/32, H04B1/707, G01S13/28, G01S7/03, H04B001/707, G01S13/325, H04B1/707, G01S7/032, G01S13/288 | 08/287645 |
| 120 | 5495249 | Ground surveillance radar device, especially for airport use | The surveillance radar device comprises, in combination, a fixed antenna for providing electronic scanning of space in bearing in the horizontal plane, a transmit source and microwave frequency transmit/receive means with a circulator, a transmit channel, a receive channel and means for subdividing the receive channel into a sum signal and at least one difference signal. A first and a second receiver element with frequency change respectively receive the sum and difference signals, and provide numerically coded outputs. Processing means process numerical signals from the first and second receiver elements for the radar detection of objects in the zone under surveillance | Chazelle Xavier (Saint-Cloud, FR), Maitre Bernard (Elancourt, FR), Augu Bertrand (Paris, FR) | Dassault Electronique (Saint Cloud, FR) | 16.05.1994 | 27.02.1996 | G01S13/00, G01S13/91, G01S13/28, G01S13/42, G01S13/93, G01S7/03, G01S13/22, G01S13/87, G01S7/28, G01S7/282, G01S7/285, G08G5/06, G08G5/00, G01S13/02, G01S13/72, G01S7/288, G01S013/00, G01S7/032, G01S7/282, G01S7/285, G01S13/22, G01S13/28, G01S13/426, G01S13/87, G01S13/91, G01S13/931, G08G5/0026, G08G5/0082, G01S13/726, G01S2007/2886, G01S2013/0254, G01S2013/9335 | 08/243128 |
| 121 | 5481504 | Method and device for determining target speed and distance with frequency modulated pulses | Frequency-modulated wave trains are used in target locating by means of transmitted pulses and evaluation of portions reflected by the target in relation to bearing, distance and speed, wherein the pulse length and bandwidth of the transmitted pulse are pre-selected. The received signals are evaluated in Doppler channels by calculation of the ambiguity function. To make possible an increase in accuracy of the speed determination with the same number of Doppler channels, the frequency of the wave train within the bandwidth is calculated in accordance with an irrational function, the exponent of which has a value between 0 and 1. The smaller the value, while keeping the same pulse length, the greater the Doppler sensitivity. This method for modulating the wave train in the transmitted pulse can be advantageously employed for target identification by means of sound waves and electromagnetic waves | Rosenbach Karlhans (Bonn, DE), Ziegenbein Jochen (Rheinbach, DE) | Atlas Elektronik GmbH (Bremen, DE) | 09.05.1994 | 02.01.1996 | G01S13/00, G01S13/58, G01S13/28, G01S15/10, G01S15/00, G01S015/10, G01S13/282, G01S13/582, G01S15/104 | 08/240069 |
| 122 | 5481270 | Radar with adaptive range sidelobe suppression | A method and apparatus for identifying a remote target includes a transmitter for transmitting pulses of energy toward the target for generating echo signals, and a receiver for receiving the echo signals, and for generating received signals representing the target, noise and clutter. The received signals are applied through a plurality of cascaded channels, each including a Doppler filter cascaded with a multiplier, each also including range sidelobe suppression, for, in each of the cascaded channels, narrowband filtering the signals passing therethrough about a controllable center frequency, and for, if necessary, converting the signals passing therethrough to baseband, for thereby applying one of a plurality of Doppler filtered baseband signals to the input of each of the range sidelobe suppressors of each of the cascaded channels. The power of the Doppler filtered baseband signals in each range bin is evaluated for determining the frequency at which the spectral density is greatest. The center frequency of at least one of the cascaded Doppler channels is controlled such that one of the Doppler channels has its center frequency at the maximum-power frequency | Urkowitz Harry (Philadelphia, PA), Bucci Nicholas J. (Upper Darby, PA), Freedman Jerome E. (Margate, NJ) | Martin Marietta Corporation (Moorestown, NJ) | 04.03.1994 | 02.01.1996 | G01S13/00, G01S13/58, G01S13/28, G01S13/95, G01S7/41, G01S7/02, G01S013/28, G01S13/28, G01S13/582, G01S7/411, G01S7/415, G01S13/95 | 08/205471 |
| 123 | 5469479 | Digital chirp synthesizer | A monolithic digital chirp synthesizer (DCS) chip using GaAs/AlGaAs HI.sup.2 L technology. The 6500 HBT gate DCS chip is capable of producing linear frequency modulated (chirp) waveforms or single frequency waveforms. The major components of the DCS are two pipelined accumulators, a sine ROM, a cosine ROM and two digital to analog converters | Chang Christopher T.-M. (Dallas, TX), White William A. (Garland, TX) | Texas Instruments Incorporated (Dallas, TX) | 27.02.1992 | 21.11.1995 | G01S7/28, G01S7/282, G01S13/00, G01S13/28, G01S13/34, G01S007/282, G01S7/282, G01S13/282, G01S13/34 | 07/842698 |
| 124 | 5463399 | MTI using a polyphase code | An improved MTI radar system including a signal expander/compressor for providing palindromic P2 phase-coded upswept and downswept expanded signals that are alternately transmitted by a radar transmitter. The echos from the upswept and downswept signals are received by a receiver, compressed in the signal expander/compressor and inputted to an MTI subtractor. Since the autocorrelation sidelobes of the palindromic phase coded echos are real, the echos from stationary clutter are completely cancelled so that the system is capable of detecting weak echos from moving targets | Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 28.01.1983 | 31.10.1995 | G01S13/28, G01S13/524, G01S13/00, G01S013/28, G01S013/524, G01S13/288, G01S13/524 | 06/463221 |
| 125 | 5463396 | ECM for long-range radars | An electronic countermeasure system carried aboard a target that creates se targets in front of and/or behind the target. The radar's transmitted signal is repeated back to the radar with a frequency effect, which induces the range-doppler coupling feature of the pulse-compression circuit to compress early or late by the ratio of the frequency offset to the radar receiver bandwidth times the uncompressed pulsed length of the radar signal | Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 16.04.1980 | 31.10.1995 | G01S7/38, G01S13/28, G01S13/00, G01S007/38, G01S7/38, G01S13/282 | 06/138958 |
| 126 | 5448221 | Dual alarm apparatus for monitoring of persons under house arrest | A monitoring system determines the presence of the person or persons to be monitored within a well-defined area or areas using one or more portable remote devices which are in two-way communication contact with a base unit. The base unit is connected to a telephone line to enable communication with a monitoring service. The base unit and remote unit incorporate spread spectrum communication technology which permits a high transmit power level. The effectiveness of the monitoring system does not depend on radio signal strength, but instead, operates using a radio ranging method that measures the time it takes for a security-coded signal to be transmitted to and returned from the remote device. The remote device also includes a mechanism for sounding an audible out-of-range warning alarm in the event that the person being monitored exceeds the house arrest boundaries. A second audible alarm preferably sounds from the remote device and the base device at predetermined times after the sounding of the out-of-range alarm if the person does not return to the house arrest area | Weller Robert N. (Virginia Beach, VA), Family ID | --- | 29.07.1993 | 05.09.1995 | G08B21/22, G08B21/00, G01S13/28, G01S13/00, G08B003/10, G08B21/22, G01S13/284 | 08/098712 |
| 127 | 5440311 | Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler filtering | A radar transmits dispersed pulses in which the subpulses are modulated by first and second mutually complementary code sequences, the autocorrelation functions of which are selected so that, in the sum of their autocorrelation functions, the main range lobes add, and the range sidelobes cancel. The received pulses with their Doppler sidebands are applied to a plurality of channels, each of which (except one) contains a mixer-oscillator combination that removes a specific Doppler phase shift along the range dimension at a different channel frequency. One channel has no mixer-oscillator because it is centered at a zero channel frequency. Within each channel, the received signals modulated by the first and second codes are matched-filtered by filters matched to the first and second codes, respectively, to produce first and second time-compressed pulses, each including (a) a main lobe representing the target range, and (b) undesirable range sidelobes. The first and second time compressed pulses are added together in each channel, to produce range pulses with suppressed range sidelobes. The channel signals, after pulse compression, delay, and addition, are each applied to one channel of a pulse-to-pulse Doppler filter bank. The outputs from the pulse-to-pulse Doppler filter bank are applied for further radar signal processing | Gallagher John J. (Turnersville, NJ), Urkowitz Harry (Philadelphia, PA) | Martin Marietta Corporation (Moorestown, NJ) | 06.08.1993 | 08.08.1995 | G01S13/522, G01S13/28, G01S13/00, G01S013/28, G01S013/42, G01S13/284, G01S13/522 | 08/103027 |
| 128 | 5434573 | Three term ripple suppression | Three term ripple suppression apparatus for suppressing ripple in a radar image derived from received radar signals. The ripple suppression apparatus comprises a field programable gate array having a radar signal input, a clock signal input, a code select signal input, and a radar signal output. The field programable gate array is adapted to implement a transfer function having the form ##EQU1## where z is a unit delay operator, and where B and C are coefficients that are set based on the code length N. First and second multipliers are respectively coupled to the field programable gate array that are adapted to receive first (B) and second (C) coefficients and transfer them to the field programable gate array for use in processing the radar signals using the transfer function. Code lengths of 1, 3, 7, and 13 are supported by the currently implemented three term ripple suppression apparatus. The present invention is compact, reliable, reprogrammable, draws relatively little power, and is relatively inexpensive to develop | Brayshaw Jeffrey A. (San Diego, CA) | Hughes Aircraft Company (Los Angeles, CA) | 30.06.1994 | 18.07.1995 | G01S7/292, G01S13/28, G01S13/00, G01S7/40, G01S007/292, G01S7/2921, G01S7/4021, G01S13/288 | 08/269462 |
| 129 | 5430445 | Synthetic aperture radar guidance system and method of operating same | A synthetic aperture radar guidance system adapted for use in a guided missile is described wherein the frequency of the transmitted pulses changes with time with a chirp slope which varies with range. The time between pulses also changes as a function of range. The desired values of the chirp slope and the interpulse interval are computed for all values within a range of interest and stored. Furthermore, the operating parameters of the SAR are changed as the range changes. The time intervals and frequencies are selected to avoid interruption ambiguities and eclipsing. The phase and frequency of the synthesized signal are controlled to adjust for motion of a vehicle on which the SAR is mounted. The SAR is operated in several modes. In a search mode, the beam of transmitted pulses is steered across a mapping area to form a plurality of patches of the mapping area. The patches are combined into one map of the entire area. Each pixel of the map is compared with a target template until a match is provided. Then the SAR operates in track mode wherein a correlation process ensures the missile is steered toward the target area using a template provided using known feature data | Peregrim Theodore J. (Bedford, MA), Okurowski Frank A. (Concord, MA), Long Albert H. (Framingham, MA) | Raytheon Company (Lexington, MA) | 31.12.1992 | 04.07.1995 | G01S13/90, F41G7/00, F41G7/34, G01S13/28, G01S13/22, G01S13/00, G01S13/72, G01S7/288, G01S7/285, G01S013/90, F41G7/343, G01S13/22, G01S13/282, G01S13/9023, G01S13/9035, G01S13/723, G01S2007/2883 | 07/999758 |
| 130 | 5428361 | Large time-bandwidth chirp pulse generator | Low time-bandwidth product linear frequency modulated chirp pulses are repetitively generated as contiguous subpulses to form a pulse of extended duration with each subpulse respectively mixed with one of a plurality of stepped intermediated frequencies so that the bandwidth of the contiguous subpulses is increased to the frequency bandwidth of all of the stepped intermediate frequencies such that the contiguous signal formed has a linearly varying frequency over the increased bandwidth and increased pulse duration, providing a large time-bandwidth product linear frequency modulated chirp waveform particularly useful in radar systems | Hightower Charles H. (San Clemente, CA), Kratzer Ralph I. (Findlay, OH) | Rockwell International Corporation (Seal Beach, CA) | 06.08.1993 | 27.06.1995 | G01S7/28, G01S7/282, H03B23/00, G01S13/28, G01S13/00, G01S007/282, H03B023/00, G01S7/282, H03B23/00, G01S13/282, H03B2200/0092 | 08/102924 |
| 131 | 5426665 | Signal compression systems | A signal compression system a receiver comprising, a down frequency converter to which received compressed signals are fed thereby to provide compressed baseband signals and an m-bit digital correlator defined by the serial combination of n similar smaller correlator stages, each of k-bits, where nk=m, and a Fast Fourier Transform (FFT) processor having n input ports fed from the n similar smaller correlators stages, one to each port, thereby to provide n output signals from the FFT processor which are fed to signal selector means which serves to select that output signal from the FFT processor which has the largest amplitude thereby to provide a decompressed signal | Cleverly Colin A. (Salisbury, GB2), Bayes Terence (Romsey, GB2) | Roke Manor Research Limited (Romsey, GB2) | 02.03.1994 | 20.06.1995 | G01S13/28, G01S13/00, G06F17/15, H04B1/707, H04K001/10, G01S13/28, G06F17/15, H04B1/707, H04B1/709 | 08/204129 |
| 132 | 5424742 | Synthetic aperture radar guidance system and method of operating same | A synthetic aperture radar guidance system adapted for use in a guided missile is described wherein the frequency of the transmitted pulses changes with time with a chirp slope which varies with range. The time between pulses also changes as a function of range. The desired values of the chirp slope and the interpulse interval are computed for all values within a range of interest and stored. Furthermore, the operating parameters of the SAR are changed as the range changes. The time intervals and frequencies are selected to avoid interruption ambiguities and eclipsing. The phase and frequency of the synthesized signal are controlled to adjust for motion of a vehicle on which the SAR is mounted. The SAR is operated in several modes. In a search mode, the beam of transmitted pulses is steered across a mapping area to form a plurality of patches of the mapping area. The patches are combined into one map of the entire area. Each pixel of the map is compared with a target template until a match is provided. Then the SAR operates in track mode wherein a correlation process ensures the missile is steered toward the target area using a template provided using known feature data | Long Albert H. (Framingham, MA), Peregrim Theodore J. (Bedford, MA), Young Mon Y. (Quincy, MA), Vanuga Allan C. (Acton, MA), Storm Walter H. (Lexington, MA) | Raytheon Company (Lexington, MA) | 31.12.1992 | 13.06.1995 | G01S13/90, G01C21/00, G01S13/28, G01S13/00, G01S13/24, G01S13/22, G01S013/90, G01C21/005, G01S13/282, G01S13/9023, G01S13/9035, G01S13/22, G01S13/24 | 07/999506 |
| 133 | 5414428 | Radar system with pulse compression and range sidelobe suppression preceding doppler filtering | A radar system transmits dispersed pulses, and receives echoes from targets. The echo signals are digitized and applied over a number of signal paths. In each signal path except one, the digitized signal is multiplied by one of a plurality of differential exponential signals, for converting the echo signal of different exponential signals, for converting the echo signal in each path to baseband, with the baseband frequency representing a particular Doppler which depends upon the exponential signal. In the one remaining signal path, no multiplier is used, and the echo signal is deemed to be at baseband. The signals in each path are applied through a cascade of a pulse compressor and a range sidelobe suppressor. Since Doppler filtering has not yet taken place, full compression and range sidelobe reduction is not achieved, because of extraneous pulse-to-pulse phase shifts. The signals in each signal path are applied to a filter element of a pulse-to-pulse Doppler filter bank, which removes the extraneous phase shifts, and thereby provides full suppression of the range sidelobes | Gallagher John J. (Turnersville, NJ), Urkowitz Harry (Philadelphia, PA) | Martin Marietta Corp. (Moorestown, NJ) | 06.05.1994 | 09.05.1995 | G01S13/522, G01S13/28, G01S13/00, G01S013/28, G01S13/284, G01S13/522 | 08/239051 |
| 134 | 5394151 | Apparatus and method for producing three-dimensional images | An apparatus and method is capable of acquiring useful three-dimensional ar images from an aircraft which travels in a curvilinear path to generate only a sparsely filled synthetic array. A motion measurement unit outputs position measurements as the aircraft travels in the curvilinear path. The system includes a motion compensation and timing unit and a wave transmitter which outputs chirped radar signals. An antenna coupled to the wave generator sends the chirped radar signals to a region to be imaged and receives scattered chirped radar return signals from scatterers in the region. These scattered signals are coherently mixed to baseband and digitized before being input to a processor. The processor includes a range processing unit, a memory unit and an estimator. The range processor receives and Fourier transforms the digitized return signals to obtain range profiles. The estimator completes the image formation process by three-dimensional back projection of the range profiles. It also estimates the location and complex strengths of scatterers and uses these to generate a side lobe free image | Knaell Kenneth K. (Kensington, MD), Heidbreder Glen R. (Reston, VA) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 30.09.1993 | 28.02.1995 | G01S13/90, G01S7/40, G01S13/00, G01S13/28, G01S013/90, G01S7/4021, G01S13/9035, G01S13/282 | 08/129499 |
| 135 | 5389933 | Linear pulse compression radar system and method | A method is described for improving the target-detection performance of a linear pulse compression radar system by reducing the amplitude of the temporal sidelobes contained in the autocorrelation function output of a matched filter receiver. The method involves generating a transmitter signal pulse using a waveform which linearly varies the frequency of a baseband signal between first and second frequencies which are selected so as to optimize the percentage cycle-to-cycle frequency variation in the transmitter signal pulse. In one example, the minimum frequency of the carrier waveform is set close to 0 MHz. Optimization of the percentage cycle-to-cycle frequency variation causes a reduction in the width of the compressed pulse, which the designer may choose to forego, in favor of reducing the amplitude of the temporal sidelobes of the compressed pulse signal output | Golinsky Martin (Roslyn Heights, NY) | Grumman Aerospace Corporation (Bethpage, NY) | 10.08.1993 | 14.02.1995 | G01S13/28, G01S7/32, G01S13/00, G01S7/285, G01S13/02, G01S13/34, G01S013/28, G01S7/023, G01S7/32, G01S13/282, G01S13/343 | 08/104013 |
| 136 | 5389932 | Pulse compression control system | A pulse compression control system uses a code sequence having a larger self correlation side lobe level compared with an ideal code sequence as a transmission code sequence and includes a modulating unit for modulating a The pulse is received in a demodulating unit where it is demodulated. A reception code sequence from the demodulation unit is modulated by a key ideal code sequence. A self correlation processing unit processes the ideal code sequence for pulse compression | Ota Eikichi (Kawasaki, JP), Komata Asao (Fuchu, JP) | Fujitsu Limited (Kawasaki, JP) | 10.02.1993 | 14.02.1995 | G01S13/28, G01S13/00, G01S013/30, G01S13/288 | 07/969150 |
| 137 | 5376939 | Dual-frequency, complementary-sequence pulse radar | A radar system simultaneously transmits first and second signals toward a target at higher and lower carrier frequencies, respectively. Each carrier is phase-modulated by a set of pulses. The first set of pulses is dispersed in time, and the second set of pulses is mutually complementary thereto. The transmitted pulses are reflected by the target and received simultaneously. The received signals are processed separately by Doppler filtering. Each Doppler-filtered return is code-matched filtered, and the filtered signals in each Doppler channel are summed with the corresponding Doppler-and-code-matched-filtered signals originating from the other transmitted frequency, to form range signals. Each range signal has its main lobe enhanced and its sidelobes suppressed by the summing of the code-matched-filtered mutually complementary echoes | Urkowitz Harry (Philadelphia, PA) | Martin Marietta Corporation (Moorestown, NJ) | 21.06.1993 | 27.12.1994 | G01S13/00, G01S7/02, G01S13/28, G01S7/42, G01S13/24, G01S13/522, G01S13/87, G01S013/28, G01S013/42, G01S7/42, G01S13/288, G01S13/24, G01S13/522, G01S13/87 | 08/079725 |
| 138 | 5351053 | Ultra wideband radar signal processor for electronically scanned arrays | A radar system that includes an ultra wideband radar signal processor for electronically scanned arrays that utilizes frequency offset generation (FOG) to achieve beam steering as compared with phase shift and time delay techniques of conventional radars. The device comprises a transmit antenna, a chirp generator connected to the transmit antenna and a first summing circuit, a receiver antenna connected to the first summing circuit, a Doppler de-ramping chirp circuit connected to a second summing circuit, the output of the second summing circuit connected to an amplitude and weighting circuit and the output of the amplitude circuit connected to a spectrum analyzer of a Fast Fourier Transform (FFT) circuit. The signal processing consists of mixing the target returns with the transmitted signal to obtain a video beat note signal. This video beat note signal is mixed with a Doppler de-ramping chirp waveform which is matched to the desired target velocity. The output is amplitude weighted and the FFT algorithm applied. To achieve beam steering for the detection of off boresight targets, a phased array with distributed receivers is required. Also, frequency offset generation must be incorporated into the Doppler de-ramping chirp generator | Wicks Michael C. (Utica, NY), Brown Russell D. (Holland Patent, NY) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 30.07.1993 | 27.09.1994 | G01S13/00, G01S13/02, G01S13/42, G01S13/28, H01Q3/30, H01Q3/22, H01Q3/42, G01S013/42, H01Q003/22, H01Q003/42, G01S13/0209, G01S13/282, G01S13/426, H01Q3/22, H01Q3/42 | 08/100649 |
| 139 | 5347281 | Frequency-coded monopulse MTI | A pulse-compression, MTI, doppler-radar system for determining target velty information from a single, frequency-coded uncompressed target-return pulse includes a coded modulator, two pulse compressors, and a phase-comparison processor. The coded modulator generates for transmission an uncompressed pulse with the first and second halves of the pulse coded with the even and odd harmonic sidebands of a pulse repetition frequency, respectively. The first and second halves of the pulse returning from the target are pulse compressed simultaneously by the two pulse compressors. The phase comparison processor then determines the phase difference between the compressed pulses to obtain the target velocity information | Lewis Bernard L. (Oxon Hill, MD), Cantrell Ben H. (Springfield, VA) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 23.07.1976 | 13.09.1994 | G01S13/00, G01S13/524, G01S13/28, G01S7/36, G01S013/52, G01S013/58, G01S7/36, G01S13/286, G01S13/524 | 05/707465 |
| 140 | 5331328 | Method of phased magnitude correlation using binary sequences | A method for allowing a correlation function to be applied to binary codes f length 3 to length 128. A user may specify the desired length of the binary codes for correlation processing: whether the binary code is to use a phase sidelobe level as the threshold or a sidelobe amplitude as the threshold. The user will also be asked to specify the threshold as well as an in phase coefficient referred to as alpha and an out of phase coefficient referred to as a beta. The user may also specify that the codes be expanded which results in correlated compounds having a length twice that of the specified length being displayed to the user. When the user has specified the parameters for correlation processing of the binary code length selected by the user, the program of the present invention will process the binary codes eliminating allomorphic and symmetrical forms of the codes from correlation and then display the results to the user | Pender Michael (Lancaster, CA) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 15.11.1993 | 19.07.1994 | G01S13/00, G01S13/28, G01S7/292, G01S007/292, G01S7/2921, G01S13/288 | 08/153864 |
| 141 | 5325095 | Stepped frequency ground penetrating radar | A stepped frequency ground penetrating radar system is described comprising an RF signal generating section capable of producing stepped frequency signals in spaced and equal increments of time and frequency over a preselected bandwidth which serves as a common RF signal source for both a transmit portion and a receive portion of the system. In the transmit portion of the system the signal is processed into in-phase and quadrature signals which are then amplified and then transmitted toward a target. The reflected signals from the target are then received by a receive antenna and mixed with a reference signal from the common RF signal source in a mixer whose output is then fed through a low pass filter. The DC output, after amplification and demodulation, is digitized and converted into a frequency domain signal by a Fast Fourier Transform. A plot of the frequency domain signals from all of the stepped frequencies broadcast toward and received from the target yields information concerning the range (distance) and cross section (size) of the target | Vadnais Kenneth G. (Ojai, CA), Bashforth Michael B. (Buellton, CA), Lewallen Tricia S. (Ventura, CA), Nammath Sharyn R. (Santa Barbara, CA) | The United States of America as represented by the United States (Washington, DC) | 14.07.1992 | 28.06.1994 | G01S13/00, G01S13/02, G01S13/32, G01S13/28, G01S13/34, H01Q21/00, H01Q9/04, H01Q9/27, G01S13/88, G01S013/24, G01S013/04, G01S13/0209, G01S13/286, G01S13/32, G01S13/347, H01Q9/27, H01Q21/0025, G01S13/885 | 07/913494 |
| 142 | 5323162 | Synthetic aperture radar system | A synthetic aperture radar system is mounted in a moving platform. The synthetic aperture radar system includes a multi-beam antenna having a plurality of reception beams different in direction from one another, the multi-beam antenna being adapted to receive radar echoes from objects. The width of each of the reception beams is selected such that the band width of a Doppler shift contained in the radar echo of a moving object is broader than that of a Doppler shift contained in the radar echo of a stationary object. The radar echo is pulse compressed to improve the range resolution before the frequency thereof is shifted such that the center frequency of the Doppler shift due to the velocity of the moving platform becomes zero. After the frequency shifting, the radar echo is filtered to separate the radar echoes of the moving and stationary objects from each other. The radar echoes of the moving and stationary objects are respectively subjected to Fourier transform with respect to the distance between the moving platform and the objects. The spectrum of the radar echo from the moving object is further shifted such that the center frequency of the Doppler shift due to the velocity of the object becomes zero. These reception, pulse compression, frequency shift and Fourier transform are executed for each reception beam. The spectrums in the radar echoes of the moving and stationary objects are respectively synthesized for all the reception beams. After the synthesization, the spectrums are respectively multiplied by a reference spectrum in the complex manner. The results of the multiplication are respectively inverse transformed from the spectrums | Fujisaka Takahiko (Kamakura, JP), Oh-Hashi Yoshimasa (Kamakura, JP), Kondo Michimasa (Kamakura, JP) | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) | 23.09.1993 | 21.06.1994 | G01S13/90, G01S13/00, G01S13/28, G01S013/90, G01S13/28, G01S13/9029 | 08/125589 |
| 143 | 5321409 | Radar system utilizing chaotic coding | A radar system (20) has a chaotic code source (22) with a chaotic code output (23), which generates a chaotic code according to a chaotic difference equation. The radar system (20) further includes a transmitter (24) with a carrier signal source (28) of a carrier signal (29), and an encoder (30) having as a first input the carrier signal (29) of the carrier signal source (28) and as a second input the chaotic code output (23) of the chaotic code source (22), and as an output a transmitted radar signal (36) having the chaotic code output (23) encoded onto the carrier signal (29). A radar system receiver (26) includes a correlator (46) having as a first input the chaotic code output (23) of the chaotic code source (22) and as a second input a received radar signal (44), and as an output an indication of the correlation of the first and second inputs. The correlation is used to determine the distance, speed, or other characteristic of an object that reflected the radar signal | Walker W. T. (Tucson, AZ) | Hughes Missile Systems Company (Los Angeles, CA) | 28.06.1993 | 14.06.1994 | G01S13/00, G01S13/28, G01S013/28, G01S013/30, G01S13/288 | 08/085995 |
| 144 | 5313214 | Scaled multiple function nonlinear FM waveform | Scaled multiple function non-linear FM waveforms are generated for use in digitally implemented low frequency radar. The non-linear FM waveforms are generated by combining a plurality of functions, each having varying characteristics, to form a single waveform which has the desirable characteristics of weighted linear FM waveforms without the undesirable attributes due to weighting. Accordingly, the use of the non-linear FM waveform results in an increase in detection range of eight percent over existing linear FM waveforms with no degradation in range resolution | Graziano Robert F. (Coram, NY), Singer Russell (New York, NY) | Grumman Aerospace Corporation (Bethpage, NY) | 08.04.1993 | 17.05.1994 | G01S13/00, G01S13/28, G01S013/00, G01S13/282 | 08/044018 |
| 145 | 5309161 | Radar with doppler tolerant range sidelobe suppression and time domain signal processing | A radar system includes a doppler/pulse compressor/range sidelobe suppressor filter bank (40), which separates received echo signals according to their frequency spectrum into doppler channels, and within each doppler channel performs pulse compression for reducing the duration of the received signals, and also performs range sidelobe suppression, for improving range resolution. It may be advantageous to perform certain types of processing in the time domain, such as determination of spectral moments for estimating velocity spread, mean closing velocity, and reflectivity of a diffuse target such as a weather phenomenon. An inverse (frequency-to-time) transform (50) is performed on the signals produced by the doppler/pulse compressor/range sidelobe suppressor filter bank (40), to produce a reconstructed version of the received signals. In these reconstructed signals, the pulses are compressed, and range sidelobes are reduced. The time-domain processing (62) is performed on the reconstructed signals. In a particular embodiment of the invention, the range sidelobe suppression and pulse compression filters (34a, 34b . . . ) follow the Interchannel frequency interference attributable to the non-zero bandwidth of the Doppler filters may be reduced by pulse-to-pulse time weighting (30) applied to the received signals over a time window corresponding to a particular dwell, together with inverse weighting (62) following the inverse transformation | Urkowitz Harry (Philadelphia, PA), Gallagher John J. (Turnersville, NJ), Nespor Jerald D. (Mt. Laurel, NJ), Katz Sheldon L. (Southampton, PA) | General Electric Co. (Moorestown, NJ) | 10.12.1992 | 03.05.1994 | G01S13/00, G01S13/28, G01S13/526, G01S013/28, G01S13/288, G01S13/526 | 07/988706 |
| 146 | 5309160 | Radar system and method having variable tracking range | A segmented stretch waveform for wide band high duty cycle tracking application. The waveform is divided into multiples of two spaced segments as the tracking range closes. Target returns received during spaced segments are combined to correspond to the complete waveform: and range is determined in accordance with the combined waveform. Tracking range can be varied without changing bandwidth, FM slope, duty cycle or processing time | Powell Norman F. (Catonsville, MD), Nothnick Carl E. (Pasadena, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 04.01.1993 | 03.05.1994 | G01S13/00, G01S13/70, G01S13/28, G01S013/34, G01S13/282, G01S13/70 | 08/000360 |
| 147 | 5291202 | Noise radars | In a noise radar a pseudo-random sequence is generated repeatedly and used to phase modulate a transmitted signal. The transmission is interrupted during a number of periods during each pseudo-random sequence which allows returns from targets to be received from the same antenna as is used for transmission during those periods of interruption. Each transmitted pulse, between successive periods of interruption, contains a different selection of successive digits of the code thus increasing the apparent randomness of the transmitted code and making detection more difficult | McClintock William J. (Witham, GB2) | GEC Avionics Limited (Rochester, GB2) | 13.05.1986 | 01.03.1994 | G01S13/00, G01S13/28, G01S7/36, G01S13/02, G01S007/36, G01S7/36, G01S13/288, G01S2013/0281 | 06/892447 |
| 148 | 5289192 | Signal processing method for a radar system | The present invention relates to a signal processing method for a radar system. The transmitted signal here includes a polyphase code that is optimized to the desired range/Doppler range and that is repeated periodically over time | Rohling Hermann (Wolfenbuttel, DE), Plagge Wilfried (Ohrum, DE), Minker Manfred (Ulm, DE) | Telefunken Systemtechnik AG (Ulm, DE) | 05.08.1992 | 22.02.1994 | G01S13/00, G01S13/58, G01S13/28, G01S013/28, G01S013/50, G01S13/288, G01S13/582 | 07/925055 |
| 149 | 5289188 | High resolution radar system for high speed and satellite vehicles | A radar system mounted on a satellite is scanned to provide surveillance of large areas such as the oceans. The transmitter oscillator generates bursts in the frequency range from about 20-250 megacycles. A receiver detects signals reflected from objects in the target area. The receiver enhances the value of recurrent components of selected time interval portions of the received signals. In one embodiment the transmitter bursts are modulated in accordance with a predetermined modulation pattern. The system determines to what extent it corresponds to the predetermined modulation pattern and then enhances the value of the recurrent components of the received signals. The enhancement is of those recurrent components having relative phases which change by substantially uniform increments | Chudleigh, Jr. Walter H. (Norristown, PA) | Ceridian Corporation (Minneapolis, MN) | 10.07.1963 | 22.02.1994 | G01S13/00, G01S13/28, G01S7/28, G01S013/28, G01S7/2813, G01S13/288 | 04/295283 |
| 150 | 5283586 | Method of phased magnitude correlation using binary sequences | A method for allowing a correlation function to be applied to binary codes of length 3 to length 255. A user may specify the desired length of the binary codes for correlation processing: whether the binary code is to use a phase sidelobe level as the threshold or a sidelobe amplitude as the threshold. The user will also be asked to specify the threshold as well as an in phase coefficient referred to as beta and an out of phase coefficient referred to as a alpha. When the user has specified the parameters for correlation processing of the binary code length selected by the user, the program of the present invention will process the binary codes eliminating allomorphic forms of the codes from correlation and then display the results to the user | Pender Michael (Thousand Oaks, CA), Tom Donald (Camarillo, CA), Family ID | --- | 26.02.1993 | 01.02.1994 | G01S13/00, G01S13/28, G01S7/292, G01S007/292, G01S7/2921, G01S13/288 | 08/023440 |
| 151 | 5278567 | Post detection integration method and apparatus for pulse compression radar utilizing surface acoustic wave (SAW) matched filters | Received expanded radar pulses pass through a surface acoustic wave (SAW) weighted filter (64) for sidelobe suppression, and then into a SAW tapped delay line (66). The pulses appear at the taps (66a,66b,66c) of the delay line (66) coarsely aligned in time, pass through individual SAW matched filters (68,84,86,88) for compression and envelope detectors (70,90,92,94) for demodulation, and then into a summer (74) for post detection integration. Individual frequency shifters (78,80,82) are provided between the delay line taps (66a,66b,66c) and the matched filters (84,86,88) for shifting the center frequencies of the pulses and thereby the propagation delays through the matched filters (84,86,88) to provide fine alignment of the pulses in time. The delays through the individual delay line taps (66a,66b,66c) and the frequency shifts of the frequency shifters (78,80,82) are adjustable "on the fly" to compensate for variation of pulse repetition rate (PRF) and interpulse jitter | Nourrcier Charles E. (Lakewood, CA) | Hughes Aircraft Company (Los Angeles, CA) | 25.11.1991 | 11.01.1994 | G01S13/00, G01S13/28, G01S007/292, G01S13/282 | 07/797607 |
| 152 | 5229775 | Digital pulse compression apparatus | A digital pulse compression apparatus comprises a plurality of doppler correction circuits for carrying out doppler correction in the time domain or the frequency domain and for carrying out pulse compression, and a maximum amplitude selecting means for selecting and outputting the maximum amplitude signal out of the compressed signals obtained from the doppler correction circuit at the rate of range bin period. The present invention can supply a pulse compression apparatus having a stable compression performance, even if a doppler frequency of the input signal is not known | Sakamoto Shoko (Hyogo, JP), Akagi Haruo (Hyogo, JP), Matsuda Shoji (Hyogo, JP) | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) | 13.04.1992 | 20.07.1993 | G01S13/00, G01S13/50, G01S13/28, G01S013/28, G01S013/534, G01S13/28, G01S13/505 | 07/867335 |
| 153 | 5192956 | Cascaded complementary phase code compressor | The present invention is a system that performs code compression in stages where each stage includes two processing paths 36 and 38. The two paths allow bidirectional crossover cascade complementary code compression reducing the number processing stages to log.sub.2 N and reducing the number of processing by a factor of N/(2 log.sub.2 N) where N is the length of the code. Each path includes a delay provided by a delay unit 44 and each path arithmetically combines the data from its own path with data from the other path. The upper path 36 uses an adder 40 while the lower path uses an adder/substracter unit 42 which adds or subtracts depending on the phase of the transmitted complementary phase code. The delay provided in each stage increases in a binary progression with the delay of the last stage being N/2. A systolic processor 68 is the preferred embodiment although the invention could be implemented in a programmable digital signal processor. The system can also be programmed to generate codes of various lengths | Lee Henry E. (Ellicott City, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 13.11.1991 | 09.03.1993 | G01S13/00, G01S13/28, G01S007/288, G01S013/30, G01S13/288 | 07/790909 |
| 154 | 5191347 | Pulsed Doppler radar system | A pulsed Doppler radar system comprises a transmitter for generating and transmitting a pulse signal having expanded frequency bandwidth, an antenna apparatus for sending the output of the transmitter to a target and for receiving a signal which was sent by the transmitter and reflected by the target, a receiver for processing the received signal to obtain a complex video signal, a pulse compressing circuit including a pulse Doppler processor responsive to the complex video signal for detecting a relative speed of the target and a storage device for storing a reference signal which includes a compensation factor by which an influence of the Doppler effect is compensated in accordance with the speed of the target. The pulse compressing circuit is operative to correlate the output of the pulse Doppler processor with the reference signal so as to convert the complex video signal to a signal having a narrow pulse width, a detector for performing envelope detection on the narrow pulse width signal, and a display responsive to the output of the detector for displaying a detected target thereon | Ishikawa Sachiko (Kanagawa, JP), Fujisaka Takahiko (Kanagawa, JP), Oh-hashi Yoshimasa (Kanagawa, JP) | Mitsubishi Denki Kabushiki Kaisha (JP) | 28.08.1991 | 02.03.1993 | G01S13/00, G01S13/58, G01S13/28, G01S013/53, G01S13/282, G01S13/582 | 07/751126 |
| 155 | 5189428 | Method for the processing of a digitally encoded pulse signal | Disclosed is a method for the processing of a signal received directly or indirectly from a transmitter, sending out pulses that are digitally encoded according to a transmission code of N instants: said processing comprising notably an operation of filtering that is matched with the transmitted signal and an operation of detection by the comparison of the post-filtering level of the signal with a so-called detection threshold: wherein the signal received is subjected to two processing operations A and B, the processing operation A comprising a self-correlation and the processing operation B comprising an intercorrelation with a mismatched code having a length at least equal to 3N, the function of intercorrelation of this mismatched code with the transmission code giving a major central lobe and at least N side lobes that are zero on either side of this major lobe: and wherein it is decided that there is a detection relating to one of the instants of the correlation or of the intercorrelation only if the levels of the functions of self-correlation and intercorrelation of this very same instant are higher than the detection threshold | Bouvet Jacky (Boulogne, FR), Chapelet Anne (La Celle St. Cloud, FR) | Thomson-CSF (Puteaux, FR) | 19.12.1991 | 23.02.1993 | G01S13/00, G01S13/28, G01S007/285, G01S013/28, G01S13/288 | 07/810687 |
| 156 | 5184135 | Phase measurement of received pseudonoise sequence using digital correlation | A system which receives a pseudonoise sequence signal quantizes the phase of the received signal in digital form as in-phase and quadrature digital signals. A digital correlator correlates the digital signals against the stored pseudonoise code sequence and separately accumulates the results. The accumulated results are vector added and a peak detector is utilized to determine the time of arrival of the signal. At the same time, the accumulated results are used by an arctangent calculator to derive a phase signal, which is gated as an output when the time of arrival is determined. An embodiment in a phase monopulse radar system collects the signals from four antennas spaced as pairs in both azimuth and elevation to determine the azimuth and elevation phase differences of the received signal. In this embodiment, a single digital correlator is utilized, the inputs to which are time multiplexed | Paradise Ronald Y. (Hillsdale, NJ) | GEC-Marconi Electronic Systems Corp. (Wayne, NJ) | 23.03.1992 | 02.02.1993 | G01S13/00, G01S13/44, G01S13/28, G01S013/44, G01S007/295, G01S13/288, G01S13/4454 | 07/856549 |
| 157 | 5173706 | Radar processor with range sidelobe reduction following doppler filtering | A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequenc of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time beacuse the pencil beam must be sequenced short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles, so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separetely to each Doppler frequency bin | Urkowitz Harry (Philadelphia, PA) | General Electric Company (Moorestown, NJ) | 21.01.1992 | 22.12.1992 | G01S13/00, G01S13/58, G01S13/42, G01S7/03, G01S13/22, G01S13/28, H01Q3/26, H01Q21/22, G01S013/18, G01S013/28, G01S013/42, G01S7/032, G01S13/22, G01S13/28, G01S13/426, G01S13/582, H01Q3/26, H01Q21/22 | 07/826301 |
| 158 | 5172120 | All weather tactical strike system (AWISS) and method of operation | An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of ground targets in the presence of electronic countermeasures and clutter. The SAR consists, in effect, of four frequency-agile radars sharing quadrants of a single array antenna mounted within a radome of a "four axis" gimbal with a sidelobe cancelling subarray mounted at the phase center of each quadrant. Motion sensors are also mounted on the single array antenna to provide signals for compensating for vibration and stored compensating signals are used to compensate for radome-induced errors. In addition, a signal processor is shown which is selectively operable to generate radar maps of any one of a number of desired degrees of resolution, such processor being adapted to operate in the presence of clutter or jamming signals | Slawsby Nathan (Canton, MA), Peregrim Theodore J. (Bedford, MA), Watson, Jr. Richard B. (Acton, MA), Sheldon Edward J. (Lexington, MA) | Raytheon Company (Lexington, MA) | 29.12.1980 | 15.12.1992 | G01S13/90, G01S13/00, G01S13/22, G01S13/87, G01S13/28, H01Q1/18, G01S013/90, G01S13/22, G01S13/28, G01S13/87, G01S13/9011, G01S13/9035, H01Q1/18 | 06/234044 |
| 159 | 5151702 | Complementary-sequence pulse radar with matched filtering following doppler filtering | A radar generates first and second mutually complementary binary code sequences. The autocorrelation functions of the first and second pulse sequences are selected so that, in the sum of their autocorrelation functions, the main lobes add, and the sidelobes are of equal amplitude and opposite polarity, and therefore cancel. The radar sequentially transmits dispersed pulses in which the chips are phase modulated with the two codes. The received pulses are applied uncompressed to the input of a Doppler filter bank, which filters them into various Doppler channels, each representative of a particular radial velocity of the target. Within each channel, the received signals modulated by the first code are matched-filtered by a filter matched to the first code, to produce a first time-compressed pulse, and those modulated by the second code are matched-filtered by a filter matched to the second code, to produce a second time compressed pulse. The time-compressed pulses include a main lobe which represents the range of the target, and also include sidelobes which may introduce range ambiguity. The first and second time compressed pulses are added together in each Doppler channel, to produce, in each channel, range pulses in which the range sidelobes are suppressed. Thus, range sidelobe suppression is accomplished without the use of discrete range sidelobe suppressors | Urkowitz Harry (Philadelphia, PA) | General Electric Company (Moorestown, NJ) | 22.07.1991 | 29.09.1992 | G01S13/00, G01S13/522, G01S13/28, G01S013/28, G01S13/284, G01S13/522 | 07/734003 |
| 160 | 5146229 | Constrained optimum matched illumination-reception radar | A pulse compression modified OMIR waveform s.sub.N (t) is obtained by computing the OMIR eigenfunctions .phi..sub.i, i=1, 2, . . . , .infin., for an autocorrelation function of the expected target impulse response, specifying a waveform c(t) having a desired pulse compression characteristic, and generating expansion terms ##EQU1## for various expansion indices N, until a desired waveform is obtained. The expansion coefficients c.sub.i (t) are given by ##EQU2## | Guerci Joseph R. (Astoria, NY), Schutz Robert W. (Lindenhurst, NY), Hulsmann John D. (Miller Place, NY) | Grumman Aerospace Corporation (Bethpage, NY) | 25.06.1991 | 08.09.1992 | G01S13/00, G01S13/28, G01S013/28, G01S13/282 | 07/720671 |
| 161 | 5142289 | Method for improving the amplitude-frequency characteristic of a radar system | A method of improving the amplitude-frequency characteristic when receiving a target echo (M) in a radar system installed on a satellite or an aircraft and carried at a given height (h) above the earth's surface. The method utilizes the known method of compressing a received pulse which improved dissolution of the target. According to the method, the receiving lobe of the radar is swept, independently of frequency, over a given larger angular area (.theta..sub.b l-.theta..sub.a) within which the target (M) is located. Within the smaller angular area (.DELTA..theta.) occupied by the target as seen from the radar, i.e. the momentary width (.DELTA.w) of the target echo, however, the receiving lobe is controlled in dependence on the frequencies (f.sub.1 -f.sub.2) so as to obtain a number of optimally located receiving lobes for the smaller angular area (.DELTA..theta.) | Petersson Robert N. O. (Molndal, SE) | Telefonakitebolaget L M Ericsson (Stockholm, SE) | 09.05.1991 | 25.08.1992 | G01S13/00, G01S13/28, G01S13/06, G01S013/44, G01S13/06, G01S13/282 | 07/697406 |
| 162 | 5140332 | Short pulse radar system with a long pulse transmitter | A radar system is disclosed which includes a transmitter which produces a long coded radar pulse. The return of the long coded radar pulse is compressed by a long pulse compression filter to produce a short coded pulse and the short coded pulse is compressed by a short pulse compression filter to produce a return pulse for processing by an existing processor designed to process return coded pulses of a particular format. The long pulse transmitter can also transmit a short coded precursor pulse, to improve radar range coverage, along with the long coded pulse by the provision of a switching bypass device which routes the short coded pulse return signal around the long pulse compression filter | Martin Raymond G. (Ellicott City, MD), Hill Gregory S. (Columbia, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 25.10.1991 | 18.08.1992 | G01S13/30, G01S13/00, G01S13/28, G01S013/28, G01S13/282, G01S13/30 | 07/793211 |
| 163 | 5130714 | Stretch and chirp waveform format for reduced generating and receiving hardware complexity | Unique stretch and chirp waveform formats are described which allow significant simplification of radar signal generation and receive processing hardware. The new formats produce a non-zero intermediate frequency (IF) to facilitate in-phase and quadrature (I/Q) processing but allows the use of a homodyne type of receiver architecture. That architecture greatly simplifies the receiver hardware because the first local oscillator (LO) signal is simply a sample of the transmitter drive signal and no second LO is required. The non-zero IF is achieved by control of the timing and start frequency of the first LO waveform for stretch processing and timing of the transmit signal gating for chirp processing | Taylor Stephen D. (Agoura, CA) | Hughes Aircraft Company (Los Angeles, CA) | 23.05.1991 | 14.07.1992 | G01S13/00, G01S13/28, G01S013/26, G01S13/282 | 07/704488 |
| 164 | 5128681 | Multi-pulse pulse compression radar system | A multi-pulse pulse compression radar system transmits two or more radar pulses having different frequency components having a time delay therebetween. A signal conditioning stage time and phase aligns the received signals and provides a composite radar signal having time and phase continuity throughout | McGroary Francis X. (Oak Ridge, NJ), Lindell Kevin (Trumbull, CT), Greenspan Marshall (Fairfield, CT) | United Technologies Corporation (Hartford, CT) | 27.06.1991 | 07.07.1992 | G01S13/30, G01S13/00, G01S13/28, G01S013/08, G01S13/282, G01S13/30 | 07/722418 |
| 165 | 5124710 | Coherent pulse radar system and method for the detection of a target presenting flashes of very short duration | This radar system comprises an emitter (3, 4, 5) for the transmission of coherent non-equidistant pulses forming a periodic pattern and being distinguished from each other by a phase modulation according to different quasi-orthogonal laws, the average interval between pulses being of the the system comprises a single receiver (7) and a device (8) for coherent elimination of the clutter and echoes of the target bodies, followed by N processing channels for pulse compression (9.1 to 9.N) by correlation with the particular phase modulation laws. The outputs from the processing channels are sent to a device (11) for elimination of secondary peaks due to partial ambiguities. The invention applies to radar surveillance systems for helicopter detection | Debuisser Jean-Claude (Montigny le Bretonneux, FR) | Le Centre Thomson d'Applications Radars (Velizy Villacoublay, FR) | 17.12.1990 | 23.06.1992 | G01S13/30, G01S13/00, G01S13/22, G01S13/524, G01S13/28, G01S007/288, G01S007/292, G01S13/225, G01S13/288, G01S13/30, G01S13/5246 | 07/628165 |
| 166 | 5115247 | Frequency modulated, phase coded radar | A radar ranging system is disclosed which employs a frequency modulated and phase coded transmission signal which can have up to a 100 percent duty cycle and which performs time tracking of the radar target and does not require extreme accuracy in frequency modulation, or extreme receiving antenna to transmit antenna isolation | Thue Baard H. (Columbus Township, Anoka County, MN) | Honeywell Inc. (Minneapolis, MN) | 12.10.1989 | 19.05.1992 | G01S13/00, G01S13/28, G01S013/28, G01S013/34, G01S013/36, G01S13/282, G01S13/288 | 07/423489 |
| 167 | 5115244 | Radar system with active array antenna, elevation-responsive PRF control, and pulse integration control responsive to azimuth angle | A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequence of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time because the pencil beam must be sequenced short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles, so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separately to each Doppler frequency bin | Freedman Jerome E. (Moorestown, NJ), Perry Michael S. (Haddonfield, NJ), Gallagher John J. (Turnersville, NJ) | General Electric Company (Moorestown, NJ) | 16.04.1991 | 19.05.1992 | G01S13/00, G01S13/42, G01S13/44, G01S13/22, G01S13/28, G01S13/66, G01S013/22, G01S013/66, G01S13/22, G01S13/282, G01S13/426, G01S13/44, G01S13/66 | 07/686053 |
| 168 | 5115243 | Radar system with active array antenna, beam multiplex control and pulse integration control responsive to azimuth angle | A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequence of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time because the pencil beam must be sequenced short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles, so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separately to each Doppler frequency bin | Perry Michael S. (Haddonfield, NJ), Freedman Jerome E. (Moorestown Township, Burlington County, NJ), Gallagher John J. (Washington Township, Gloucester County, NJ) | General Electric Co. (Moorestown, NJ) | 16.04.1991 | 19.05.1992 | G01S13/00, G01S13/42, G01S13/44, G01S13/22, G01S13/87, G01S13/524, G01S13/28, G01S13/66, G01S7/28, G01S7/282, G01S13/02, G01S013/66, G01S7/282, G01S13/22, G01S13/282, G01S13/426, G01S13/44, G01S13/5246, G01S13/66, G01S13/87, G01S2013/0254, G01S2013/0272 | 07/686092 |
| 169 | 5103233 | Radar system with elevation-responsive PRF control, beam multiplex control, and pulse integration control responsive to azimuth angle | A multipurpose system provides radar surveillance for air traffic control purposes. The system includes four separate active phased-array antennas, each with .+-.45.degree. coverage in azimuth, from 0.degree. to 60.degree. in elevation. Each antenna element of each phased-array antenna is coupled by a low-loss path to the solid-state amplifier associated with a transmit-receive (TR) module. Each antenna produces a sequence of pencil beams, which requires less transmitted power from the TR modules than a fan beam, but requires more time because the pencil beam must be sequenced short time, the PRF is responsive to the elevation angle of the beam, so higher elevation angles use a higher PRF. Low elevation angle beams receive long transmitter pulses for high power, and pulse compression is used to restore range resolution, but the long pulse results in a large minimum range within which targets cannot be detected. A second scan is provided at low elevation angles with a short transmitter pulse to fill in the short-range coverage. Beams at higher elevation angles transmit pulse widths which are shorter than beams at low elevation angles so that the minimum range requirement is met without a second scan, which also reduces the time required for volumetric scan. The number of pulses which are integrated to produce a return increases off-axis, to restore system margin lost due to off-axis power gain reduction. The volumetric scan rate is increased by a dynamic scan regimen by which subsets of beams are pulsed with a high transmitter PRF but with a low effective beam PRF to reduce range ambiguity and preserve Doppler resolution without the usual increase of scan time. For best range resolution, Doppler processing is used, with range sidelobe pulse suppression applied separately to each Doppler frequency bin | Gallagher John J. (Turnersville, NJ), Freedman Jerome E. (Moorestown, NJ), Perry Michael S. (Haddonfield, NJ) | General Electric Co. (King of Prussia, PA) | 16.04.1991 | 07.04.1992 | G01S13/58, G01S13/42, G01S13/95, G01S13/44, G01S13/22, G01S13/28, G01S13/00, H01Q21/00, G01S001/16, G01S001/18, G01S13/22, G01S13/28, G01S13/426, G01S13/44, G01S13/582, G01S13/951, H01Q21/0025 | 07/686051 |
| 170 | 5093663 | Pulse compression radar system with data transmission capability | A radar system, such as a tracking radar installation or other radar installation which is of the pulse compression type, transmits data during transmission of the radar signal. The data is transmitted by inserting, into the radar signal, at least one short nonpulse interval. The position of the nonpulse interval within the radar pulse can be modulated | Baechtiger Rolf (Oberwill-Lieli, CH), Steffen Andreas (Schlieren, CH) | Siemens-Albis Aktiengesellschaft (Zurich, CH) | 14.11.1988 | 03.03.1992 | G01S7/00, G01S13/78, G01S13/28, G01S13/00, G01S013/28, G01S7/006, G01S13/28, G01S13/78 | 07/270561 |
| 171 | 5083130 | Pulse radar and components therefor | A pulse radar for operation at 94 GHz and higher frequencies is shown to include an antenna, a diplexer and first detector that are each optically fed so that radio frequency signals may be, when transmitting, passed through the diplexer to the antenna and, when receiving, from the antenna through the diplexer to the first detector | Cardiasmenos Apostle G. (Acton, MA), Family ID | --- | 08.03.1991 | 21.01.1992 | G01S7/02, G01S7/03, G01S13/28, G01S13/00, G01S7/285, H01Q19/10, H01Q3/00, H01Q15/00, H03D9/06, H01P1/213, H01Q3/20, H03D9/00, H01Q15/12, H01Q19/195, H01Q21/24, H01Q3/16, H01Q3/26, H01P1/20, H01P1/16, H01P1/161, G01S013/00, G01S7/02, G01S7/024, G01S7/026, G01S7/034, G01S7/285, G01S13/282, H01P1/161, H01P1/2131, H01Q3/16, H01Q3/20, H01Q3/26, H01Q15/12, H01Q19/195, H01Q21/245, H03D9/0633 | 07/666826 |
| 172 | 5081433 | Two state phase modulator with minimum amplitude modulation | The invention relates to a two state phase modulator with minimum amplitude modulation. The modulator assumes two phase states differing by .THETA. where .THETA. is a sub-multiple of 180.degree. which permits a phase variation of 180.degree. for phase coded transmissions when the frequency of the phase modulated carrier wave is multiplied by the reciprocal of the sub-multiple. Three equal components are derived in the phase modulator: an in-phase, an out of phase, and a quadrature phase component. The out of phase component is delayed in relation to the in-phase component by .THETA./2, while the quadrature phase component is delayed .THETA./4. The in-phase and out of phase components are then reduced by a factor (2 sin .THETA./2) selected such that when added to the quadrature component, the resultants have a magnitude equal to that of the quadrature component and differ in phase from the quadrature comonent by .+-..THETA./2. The modulator output is formed of the resultants supplied in alternation with the quadrature component at zero phase being supplied during the transitions. Amplitude variation during the phase modulation process is reduced to a fraction of a decibel | Erickson Bert K. (Fayetteville, NY), Rosys George C. (North Syracuse, NY), Jureller John F. (Syracuse, NY), Jacek Victor J. (Syracuse, NY) | General Electric Company (Syracuse, NY) | 03.12.1990 | 14.01.1992 | G01S13/28, G01S13/00, H03C3/00, H03C3/04, H03C003/00, G01S13/288, H03C3/00, H03C3/04 | 07/620667 |
| 173 | 5079735 | High-dynamic-range compressive receiver | A compressive receiver (10) includes a modulation circuit (14) that modulates the receiver input signal with compensation values equal to the ratio of the transfer function of an ideal linear dispersive delay line to that of the main compressive-receiver linear dispersive delay line (22). An auxiliary linear dispersive delay line (16) dispersively delays the results modulated signal at the reciprocal of the compressive receiver's chirp rate, and the resultant signal is progressively translated in frequency by a frequency translator (18) at the compressive-receiver chirp rate. As a consequence, each point in a signal-frequency component of the input signal is translated to the frequency at which the compensation function was evaluated in modulating the component at that point in time, so the departure of the main dispersive delay line (22) from linearity is compensated for, and increased dynamic range results | Apostolos John T. (Merrimack, NH) | Sanders Associates, Inc. (Nashua, NH) | 20.02.1990 | 07.01.1992 | G01S13/28, G01S13/00, G06G007/19, H04B017/00, G01S013/00, G01S13/282 | 07/482312 |
| 174 | 5075863 | Distance measuring method and apparatus therefor | A distance measuring method and apparatus in which first and second pseudo random signals which are the same in pattern but slightly different in period are generated to obtain a correlation output of the first and second pseudo random signals before transmission thereof as a reference correlation output, and the first pseudo random signal is directly transmitted toward a target or alternatively a carrier wave is modulated by the first pseudo random signal and transmitted toward the target. A correlation output of the signal reflected and received from the target and the second pseudo random signal is detected and the distance to the target is measured from the time interval between the reference correlation output and the received correlation output. Alternatively, the modulated carrier wave reflected and received from the target and the second pseudo random signal are subjected to correlation processing to detect a correlative modulated carrier wave and the correlative modulated carrier wave is subjected to orthogonal detection by a reference carrier wave thereby obtaining a target detection output. Then, the distance to the target is measured from the time interval between the reference correlation output and the target detection output | Nagamune Akio (Tokyo, JP), Tezuka Koichi (Tokyo, JP), Kanao Yoshiyuki (Yokohama, JP) | NKK Corporation (Tokyo, JP) | 07.02.1989 | 24.12.1991 | B22D2/00, G01F23/284, G01S13/28, G01S13/00, G01S13/32, G01S009/00, B22D2/003, G01F23/284, G01S13/288, G01S13/325 | 07/307891 |
| 175 | 5070337 | Optimization method and an optimized filter for sidelobe suppression | An optimization method for sidelobe suppression filters, and a filter utilizing a binary coding waveform are formulated. The method comprises expanding the frequency transfer function of an ideal sidelobe suppression filter into a polynomial series: truncating the polynomial series into a finite-termed polynomial series with unknown weighting coefficients A,B,C,D . . . , using the inverse Fourier transform to convert the finite-termed polynomial series into the corresponding pulse response in the time domain: then using the LP algorithm to minimize the output peak sidelobes to determine all the weighting coefficients A, B, C, D . . . and inserting them back to the inverse transfer function of the optimized filter | Chen Xiao H. (90570 Oulu, FI), Oksman Juhani (90250 Oulu, FI), Family ID | --- | 05.04.1991 | 03.12.1991 | G01S13/28, G01S13/00, G11B15/68, G11B17/22, G01S007/28, G01S13/288, G11B15/68, G11B17/22 | 07/681329 |
| 176 | 5055850 | Waveform generator | A waveform generator (12') is responsive to a reference clock signal input for producing an output waveform which is a linear FM waveform. A reference clock signal is supplied to the generator which performs a double integration to obtain the phase of the output signal. The phase resulting from the double integration is used to obtain the sine of the phase using a lookup table. The sine of the phase is input to digital-to-analogue (D/A) converter, and the output from the D/A converter is filtered using a bandwidth matched to the bandwidth of the transmitted signal. The generator is useful in radar systems for area mapping and target identification | Lamper David (St. Charles, MO), Grettenberg Thomas L. (St. Louis, MO) | Electronics & Space Corporation (St. Louis, MO) | 04.09.1990 | 08.10.1991 | G01S13/90, G01S13/28, G01S13/00, G01S013/89, G01S13/282, G01S13/90 | 07/576996 |
| 177 | 5047780 | Pulse radar apparatus and pulse discrimination circuit suitable for incorporation in a pulse radar apparatus | A pulse radar apparatus is provided with a transmitting unit (4) for the transmission of a modulated transmitter pulse Y.sub.t, a mixer (9), an IF amplifier (11) and a quadrature detector (12) for the reception of signals Y.sub.r and the correlation of signals Y.sub.r with a replica X of the emitted modulated transmitter pulse Y.sub.t, to obtain an in time compressed correlation signal .sigma..sub.xy (.delta.). The pulse radar apparatus is also provided with a pulse discriminator (3) to enable, on the basis of at least one amplitude .vertline.Y.sub.r .vertline. of the received signal Y.sub.r and at least one amplitude .vertline..sigma..sub.xy (.delta.).vertline. of the correlation signal .sigma..sub.xy (.delta.), differentiation between the signals Y.sub.r, possessing modulation, and interference | Dijkstra Jan A. (Almelo, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 12.07.1990 | 10.09.1991 | G01S13/00, G01S13/28, G01S7/292, G01S013/08, G01S7/292, G01S13/28 | 07/553023 |
| 178 | 5036328 | Pulse compressing apparatus for a radar system using a long pulse | A pulse compressing apparatus for use in a radar system receives an input signal data stream which has been received by the radar system and which corresponds to a transmitted long pulse. A weight coefficient generator generates the same number of weight coefficients as the number of input signal values in the input signal data stream. The same number of arithmetic units is provided and the weight coefficients are sequentially transferred to each arithmetic means where they are processed with the input signal values. The results of the processing from the arithmetic units are added together to produce a compressed pulse output | Nakamura Hiroshi (Tokyo, JP), Kiuchi Eiichi (Tokyo, JP) | NEC Corporation (Tokyo, JP) | 31.05.1990 | 30.07.1991 | G01S13/00, G01S13/28, G01S013/28, G01S13/282 | 07/531364 |
| 179 | 5036324 | Pulse compression technique for high duty factor radar | A method of signal processing for use in high duty factor radars for detecting targets at ranges both shorter and longer than a minimum range defined by a transmitted pulse having a defined pulse length. A coded pulse coherent array waveform is transmitted and a return signal which is a waveform reflected off a target is received. The reflected waveform is sampled and time shifted by adding data to its beginning and end. The vector is then processed (pulse compressed) to obtain target information. Target information can now be obtained which is normally in a "blind zone", because the distance of the target from the radar is such that it appears during an interval when sampling is not done because of waveform transmission | Lamper David (St. Charles, MO), Grettenberg Thomas L. (St. Louis, MO) | Electronics and Space Corporation (St. Louis, MO) | 05.10.1990 | 30.07.1991 | G01S13/00, G01S13/28, G01S013/28, G01S007/295, G06F015/332, G01S13/284 | 07/593027 |
| 180 | 5034750 | Pulse radar and components therefor | A pulse radar for operation at 94 GHz and higher frequencies is shown to include an antenna, a diplexer and first detector that are each optically fed so that radio frequency signals may be, when transmitting, passed through the diplexer to the antenna and, when receiving, from the antenna through the diplexer to the first detector | Cardiasmenos Apostle G. (Acton, MA) | Raytheon Company (Lexington, MA) | 31.10.1983 | 23.07.1991 | G01S7/02, G01S7/03, G01S13/00, G01S13/28, G01S7/285, H01Q19/10, H01Q3/00, H01Q15/00, H03D9/06, H01P1/213, H01Q3/20, H03D9/00, H01Q15/12, H01Q19/195, H01Q21/24, H01Q3/16, H01Q3/26, H01P1/20, H01P1/16, H01P1/161, G01S007/28, G01S7/02, G01S7/024, G01S7/026, G01S7/034, G01S7/285, G01S13/282, H01P1/161, H01P1/2131, H01Q3/16, H01Q3/20, H01Q3/26, H01Q15/12, H01Q19/195, H01Q21/245, H03D9/0633 | 06/547548 |
| 181 | 5032843 | Pulse compression radar and application for mapping or meteorology | A radar device, of the almost linearly frequency-modulated type of the transmission signal during the pulse, comprises a transmit circuit including a high-frequency oscillator (29), a transmit-receive aerial (7) and a receive circuit including a pulse compression element (33). According to the invention, inside the transmit circuit, an Impatt diode (17) of a diode switch (16) produces directly at microwave frequency a synchronizing signal of the oscillator (pulses modulated in accordance with negative frequency slopes). For this purpose, a clock pulse generator (26) commands a switch (25) arranged in series on the conductor (19) of the supply current of the Impatt diode (17) which current is substantially continuous, to conduct for the duration of each pulse to be transmitted | Zilliox Jean-Marie (Paris, FR) | U.S. Philips Corporation (New York, NY) | 13.12.1988 | 16.07.1991 | G01S13/00, G01S13/28, G01S7/28, G01S7/282, H03B9/14, H03B9/00, G01S013/522, G01S013/89, G01S7/282, G01S13/28, H03B9/14, H03B2009/126, H03B2200/0074 | 07/283652 |
| 182 | 5019825 | Coherently interruptible frequency hopped chirp generator | A coherently interruptible frequency hopped chirp waveform generator has a ignal generating synthesizer and a chirp generator with digitally stored chirp samples in which both are phase locked to a reference clock and responsive to a timing and control circuit. The digitally stored chirp signal sample is D/A converted and mixed with a fixed frequency signal generated by the synthesizer forming translated chirp signals. The translated chirp signals are output, being controlled by a timing and control circuit so that a plurality of coherently interruptible and frequency selectable chirp sub-pulses are formed | McCorkle John (College Park, MD) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 24.11.1989 | 28.05.1991 | G01S13/00, G01S13/28, G01S013/522, G01S13/28 | 07/440944 |
| 183 | 4989010 | Method and device for identical processing of several simultaneous analog signals of short duration and tracking radar using this device | A method and a device which make it possible, simultaneously and in a perfectly identical manner, to process n analog signals (E.sub.1, E.sub.2 . . . ) of short duration. The device comprises n processing channels (V.sub.1, V.sub.2, . . . ) each receiving an analog signal and each possessing in series, a processing circuit (11, 12: 21, 22: . . . ) for frequency transfer (F.sub.1, F.sub.2, . . . ), and a delay circuit .tau..sub.1, .tau..sub.2, . . . (13, 23, . . . ) respectively. A set of switches (C.sub.1, C.sub.2, . . . , C'.sub.1, C'.sub.2, . . . ) interconnect the inputs and outputs of the various elementary processing all the n elementary channels (V.sub.1, V.sub.2, . . . ) successively and sequentially, for a processing cycle. This permits the fine analysis of the echo signals received from a target consisting of several bright points, by a pulse compression radar | Crevoulin Roland (Paris, FR), Ambos Rene (Morangis, FR), Bonnier Jean-Joel (Ville D'Avray, FR) | Thomson CSF (Paris, FR) | 21.12.1983 | 29.01.1991 | G01S13/00, G01S13/70, G01S13/28, G01S013/44, G01S007/40, G01S013/28, G01S13/282, G01S13/70 | 06/565602 |
| 184 | 4983979 | Radar detection of targets at short and long range | A transmitting channel includes a pulse generator unit for generating frequency or phase code modulated pulses having a common centre frequency. The pulses are transformed to a transmitting frequency in the transmitting channel. An antenna, which is connected to the output of the transmitting channel, radiates the transformed frequency pulses and receives return signals. A receiver channel processes the return signals. The receiver channel includes a pulse compressor unit for compressing the return signals. Each pulse to be transmitted consists of two or more sub pulses, at least one of the sub pulses being substantially longer than at least another one of the sub pulses. Each sub pulse is coded with a different compression code. The compression code of each sub pulse having a low cross-correlation property with the compression codes of all other sub pulses, all sub pulses having the same center frequency | McKenzie Jennifer A. H. (Ottawa, CA) | Canadian Marconi Company (Montreal, CA) | 28.03.1989 | 08.01.1991 | G01S13/00, G01S13/30, G01S13/28, G01S013/38, G01S13/284, G01S13/30 | 07/329886 |
| 185 | 4972441 | Enhanced pulse time-of-arrival detector | A detector for detecting a communication pulse in the presence of noise is disclosed having a transmitter for transmitting a communication pulse of carrier frequency having a main pulse portion and a pre-pulse portion, the pre-pulse portion being of substantially opposite phase to the main pulse portion, a receiver for receiving the communication pulse, a correlation signal circuit connected to the receiver for providing a correlation signal, the correlation signal having first and second slopes in response to the communication pulse, the second slope being steeper than the first slope, and a comparator connected to the correlation signal circuit for providing a pulse detection output signal when the correlation signal reaches a predetermined threshold, the threshold being set at level to detect the correlation signal at a point on the second slope | Roberts James L. (Seattle, WA), Richardson John F. (Bellevue, WA) | Honeywell, Inc. (Minneapolis, MN) | 17.11.1988 | 20.11.1990 | G01S13/00, G01S7/292, G01S13/28, H04L027/22, G01S7/292, G01S13/288 | 07/274639 |
| 186 | 4968968 | Transmitter phase and amplitude correction for linear FM systems | A system is disclosed for measuring and correcting for waveform modulation errors in a radar system employing FM signals and a digitally controlled waveform generator. The system relies on the assumption that the transmitter and other waveform phase and amplitude error contributions are slowly varying with respect to the radar mode data collection time and that instantaneous pulse-by-pulse correction is not necessary. During a calibration mode, a small portion of the transmitter output is input into the receiver and mixed with the waveform generator signal, with the waveform modulation being removed from the mixer signal, such that the mixer signal is at a constant IF but with phase and amplitude variations that result from the distortions. The radar digital processor measures these distortions, and during normal radar operation predistorts the waveform generator signal with phase distortions in antiphase with the measured distortions to compensate for the measured distortions. Amplitude distortions are compensated by control of a variable attenuator device. As a result, the system compensates for the exciter and transmitter distortions as well as distortions introduced by the receiver input circuitry | Taylor Stephen D. (Agoura, CA) | Hughes Aircraft Company (Los Angeles, CA) | 09.11.1989 | 06.11.1990 | G01S13/00, G01S13/28, G01S7/40, H04B1/12, H04B001/02, G01S7/4008, G01S13/282, H04B1/123 | 07/434968 |
| 187 | 4952940 | Radar system with a digital expander | In a radar system, comprising a digital expander, two analog modulation signals are generated with two digital to analog converters and raised to an intermediate frequency range through a quadrature modulator. The amplitude and phase ripple of the output signal occurring in the quadrature modulator due to limited carrier and image frequency suppression are compensated through a multiple regulating circuit. To this end, if necessary calibration signals, of constant amplitude and different phase positions, are generated sequentially by means of the two digital to analog converters and the amplitude of their output signals measured in an amplitude detector. Setting values for the multiple regulating circuit are determined from the averaged amplitude measured values in a phase and amplitude correction unit which via setting elements set the requisite offset and phase and amplitude symmetry values until the deviations of the output signal in amplitude and phase disappear | Kuepfer Hanspeter (Birmensdorf, CH) | Siemens-Albis (Zurich, CH) | 18.01.1989 | 28.08.1990 | G01S13/28, G01S13/00, G01S7/40, G01S007/40, G01S7/4008, G01S13/288 | 07/298440 |
| 188 | 4952939 | Radar intrusion detection system | A bistatic Doppler radar intrusion detection system which utilizes a high duty-cycle phase-coded pulse compression signal to provide a range-gated detection zone is described. The combined transmit and receive antenna beam patterns define the shape of the detection zone in azimuth and elevation. The distance from the antennas to the detection zone and depth of the detection zone are determined by the pulse compression code sequence selections. The system consists of a transmitter having a code sequence generator for generating one of a selected number of codes and a code sequence. An antenna transmits the modulated signal through the detection zone. A programmable digital delay circuit is used to provide a delayed replica of the code sequence and thereby specify the detection zone range. A receiver is provided having an antenna for receiving signals scattered from the detection zone. The received signal is split into two paths, in-phase and quadrature-phase and reference signals from the delayed replica used to synchronously detect the received signal. Processing circuitry computes the Doppler frequency spectra of the received signal and performs automatic detection of targets traversing the detection zone | Seed Willian R. (Nepean, Ontario, CA), Family ID | --- | 16.02.1989 | 28.08.1990 | G01S13/28, G01S13/00, G01S13/04, G01S009/42, G01S13/003, G01S13/04, G01S13/288 | 07/311271 |
| 189 | 4937580 | Geophysical radar apparatus and method | A ground probing radar is described for detecting radar reflections from underground objects. The radar is of the pulse compression type. A transmitter generates a biph Government Support The U.S. Government has rights to this invention pursuant to Contract No. 536115 (DACA 89-81-K-0004) awarded by U.S. the Army Cold Regions Research and Engineering Laboratory | Wills Robert H. (Fairlee, VT) | Trustees of Dartmouth College (Hanover, NH) | 19.05.1988 | 26.06.1990 | G01S13/02, G01S13/88, G01S13/00, G01S13/28, G01V3/12, G01V003/12, G01S13/0209, G01S13/284, G01S13/88, G01V3/12, G01S13/885 | 07/195848 |
| 190 | 4929954 | Device for computing a sliding and nonrecursive discrete Fourier transform and its application to a radar system | A device for computing a nonrecursive and sliding discrete Fourier transform as applicable in particular to processing of a pulse compression radar signal has N identical and parallel stages (E.sub.k) for receiving in each case samples of the input signal (e.sub.m+N). Each stage comprises two complex rotation operators, two adder-subtracters and two delay circuits and delivers a signal X.sub.k.sup.m+1 obtained from the following equations: ##EQU1## | Elleaume Philippe (Antony, FR) | Thomson-CSF (Paris, FR) | 23.09.1986 | 29.05.1990 | G01S13/00, G01S13/28, G06F17/14, G06T9/00, G01S007/44, G01S13/284, G06F17/141, G06T9/007 | 06/910578 |
| 191 | 4901082 | Adaptive waveform radar | Prior art radar systems do not adapt the transmitted signal to avoid the interference bands but only filter the unadaptive receiver signal to eliminate the interference with resulting loss in detectability and distortion that in turn causes loss in resolution and increased ambiguity. The present invention allows a radar system to operate in an electromagnetic environment where co-channel narrow band interference is present, without loss of detectability, resolution and ambiguity. The present invention system adapts the radar transmitted signal so that its spectral energy is significant only in the interference free portions of the radar channel. It next adapts the receiver to detect this transmitted spectrum and then equalizes the signal by means of transversal equalizer coefficients to reduce distortions to the signal sidelobes | Schreiber Heinz H. (Centerport, NY), O'Connor Martin G. (Massapequa, NY) | Grumman Aerospace Corporation (Bethpage, NY) | 17.11.1988 | 13.02.1990 | G01S13/00, G01S13/28, G01S7/28, G01S7/40, G01S007/34, G01S7/28, G01S7/4004, G01S13/282 | 07/272374 |
| 192 | 4894660 | Range sidelobe reduction by aperiodic swept-frequency subpulses | A swept-frequency radar system transmits pulses consisting of swept-frequency subpulses of nonuniform duration separated by short nontransmitting periods during which an array antenna is resteered. The pulses reflected from a target are processed by a method including estimating the target ranges, producing a reference signal at the time at which the pulse reflected from the target is expected to return. The reflected pulse is phase detected by means of the reference pulse to produce phase detected signals which include information relating to the error between the actual range and the estimated range. The phase detected signals are Fourier transformed to produce range error information. The nonuniform subpulse durations reduce the magnitude of range sidelobes | Thomson Don N. (Haddonfield, NJ), Maron David E. (Marlton, NJ) | General Electric Company (Moorestown, NJ) | 12.10.1988 | 16.01.1990 | G01S13/00, G01S13/28, G01S13/42, G01S013/26, G01S013/30, G01S013/38, G01S13/28, G01S13/428 | 07/256681 |
| 193 | 4875050 | Generalized doppler matched binary pulse compressor | A Doppler matched binary pulse compressor having means to initiate operation, means to generate a Doppler matched filter bank, means to compress the pulses from the Doppler matched filter, either linear or soft limited, means to estimate the signal phase in real time and means to select overall optimal filters in real time. The foregoing includes a phase estimator having a quadrant detector and means to scale the quadrature components while preserving the signal phase, means to reduce accuracy computations to 45.degree. or less of the first quadrant, and means to reconstruct the phase to place the signal in the proper quadrant | Rathi Dev D. (Los Angeles, CA) | ITT Gilfillan, a division of ITT Corporation (Van Nuys, CA) | 12.02.1988 | 17.10.1989 | G01S13/00, G01S13/28, G01S007/32, G01S007/44, G06F007/38, G01S13/288 | 07/155423 |
| 194 | 4853701 | Pulse compression method employing space-coding, and its application to a radar | Pulse-compression method employing space-coding, according to which a plurality of pulsed signals are emitted, simultaneously, for a time (1/.DELTA.f), at frequencies which are uniformly graded by an increment (.DELTA.f), the pulsed signals which are returned by any target being spatially compressed, the compression factor being equal to the number of signals which were emitted simultaneously | Drabowitch Serge (Paris, FR) | Thomson-CSF (Paris, FR) | 29.08.1983 | 01.08.1989 | G01S13/28, G01S13/00, G01S13/48, G01S013/42, G01S013/28, G01S13/284, G01S13/48 | 06/528458 |
| 195 | 4849760 | Surface acoustic wave doppler detector | A surface acoustic wave (SAW) radar doppler shift detection system is provided by transmitting a modulation signal having an up-chirp component followed by a downchirp component from a dispersive array SAW assembly to a target, and then receiving the radar return from the target by a receiver which also employs a similar dispersive array assembly. Dispersive array assemblies are constructed with two in line dispersive arrays. The dispersive arrays of the transmitter is positioned relative to two input SAW transducers and two output SAW transducers such that a pulse signal supplied to the two input transducers results in an expanded signal of the output transducers. The expanded signal acts as a modulation signal which is multiplied by an RF and transmitted. The receiving array assembly detects the radar return signal, and, after it is multiplied down to the SAW frequency, compresses it. When the target is stationary relative to the transmitter and receiver platform, a single envelope will be detected which indicates that no doppler shift has occurred. When there is relative motion between the target and the platform, the spacing between two detected envelopes, and their relative shifts, is measured and utilized to provide an indication of the magnitude and direction of the doppler shift. The transducers of the array assembly are formed of hyperbolically shaped fingers to provide a wideband range of frequencies | Solie Leland P. (Mahomet, IL) | Unisys Corporation (Blue Bell, PA) | 20.11.1987 | 18.07.1989 | G01S13/28, G01S13/00, G01S13/58, H03H9/44, H03H9/00, H03H9/145, G01S013/58, G01S13/282, G01S13/582, H03H9/14555, H03H9/14561, H03H9/14564, H03H9/44 | 07/123466 |
| 196 | 4847624 | Coordinate system transformation apparatus for a high resolution radar | The present invention includes an apparatus that prebiases a transmitted radar signal. The prebiasing of the transmit signal automatically aligns the return signals in one dimension or dimensionally transforms the return signals thereby removing the need for one of the dimensional processing operations of a conventinal two dimensional return signal interpolator. A map function generator produces small frequency (phase) changes in the transmitted signal during each pulse over the entire integration or exposure period. The map function generator produces a parabolic frequency change control signal applied during the integration period. The control signal is divided into segments where each segment controls a single transmit pulse. The control signal modifies a linear frequency modulation control signal. conventionally produced by high resolution radar systems | Hopwood Francis W. (Severna Park, MD), Kane Jerry A. (Crofton, MD), Ioannidis George A. (Bel Air, MD), Decker Martin J. (Baltimore, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 30.12.1987 | 11.07.1989 | G01S13/28, G01S13/00, G01S13/90, G01S013/90, G01S007/44, G01S13/282, G01S13/90 | 07/139512 |
| 197 | 4843331 | Coherent digital signal blanking, biphase modulation and frequency doubling circuit and methodology | An information bearing signal (the object signal) for use in radar or radar-like circuitry is generated in a digital circuit and then converted through a bandpass matching filter into a corresponding analog signal. The object signal is then first combined in a NAND gate with a blanking control signal. In one embodiment, the selectively blanked object signal is frequency doubled by combining the blanked object signal and its quarter wave length shifted version in an EXCLUSIVE-OR gate. Thereafter, the frequency doubled version of the blanked object signal is combined in a second EXCLUSIVE-OR gate with a biphase modulation control signal which selectively inverts or noninverts the frequency doubled object signal. The output of the biphase modulated frequency doubled signal is then gated through a blanking NAND gate and coupled to the bandpass matching filter. In a second embodiment the blanked object signal is first combined in an EXCLUSIVE-OR gate with the biphase modulated control signal and therafter provided as an input to a second EXCLUSIVE-OR gate wherein it is combined with a quarter wave length version of the blanked object signal. The phase modulated frequency doubled signal is then coupled to a blanking NAND gate and bandpass matching filter as before. According to the values asserted for the biphase modulation control signal and blanking signal, the object signal is digitally frequency doubled, blanked and phase modulated as desired prior to conversion into analog form | Yang Steve S. (Chatsworth, CA) | Hughes Aircraft Company (Los Angeles, CA) | 28.08.1987 | 27.06.1989 | G01S13/28, G01S13/00, G01S7/28, H03M5/00, H03M5/12, H03K007/10, H03K019/00, G01S7/28, G01S13/288, H03M5/12 | 07/090821 |
| 198 | 4833479 | Digital poly-phase pulse compressor | A digital poly phase pulse compressor that utilizes delay lines to separate KN samples of a received compressed pulse in I and Q channels, multiplies N of the KN samples with quadrature, weighted code phase signals by shifting and adding, cross couples the products of the shifting and adding in the I and Q channels to remove all code phase terms from the N samples in each channel, and combines the final n signals to provide I and Q compressed pulse components. The I and Q channels can be expanded into pluralities of channels to include compensation for Doppler shift | Carlson Eric J. (Mesa, AZ) | Motorola, Inc. (Schaumburg, IL) | 21.03.1988 | 23.05.1989 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 07/171078 |
| 199 | 4813006 | Analog-digital correlator | An analog-digital correlator 10 utilizes a plurality of sample and hold cirucits 16-0 to 16-(M-1) to directly store samples of a received analog signal. Bits of a correlation pattern are shifted through stages in a correlation pattern shift register 26. The state of the correlation pattern bits causes the value in the associated sample and hold circuit 16 to either be inverted or noninverted when it is summed with other similarly generated signals from the remaining sample and hold circuits to form the correlation output sum by network 30. The output of network 30 will peak when the bits of the digital correlation pattern signal are shifted to stages in register 26 that are aligned with the sample and hold circuits containing the digitally-impressed code of interest. In the preferred embodiment, a mask shift register 28 is used to selectively disable certain of the sample and hold circuits from affecting the correlation output sum. To this end, mask bits corresponding to the length of the digitally-impressed code are shifted through mask register 28 simultaneously with the correlation pattern bits in register 26 | Burns Richard J. (Canoga Park, CA), Grim Kenneth R. (Moorpark, CA), Levy Miguel E. (Camarillo, CA) | Hughes Aircraft Company (Los Angeles, CA) | 29.06.1987 | 14.03.1989 | G01S13/28, G01S13/00, G06J1/00, G06J001/00, G06F015/336, G01S13/288, G06J1/005 | 06/067193 |
| 200 | 4802149 | Acousto-optic two-dimensional coherent optical modulator | Outputs of a linear phased array antenna can be employed for emitter field sorting, i.e., providing an indication of the frequency and angle of arrival of signals from a plurality of radiation sources, through the use of a two-dimensional optical processor that does not require a mechanism for correcting for acoustic spreading in a multi-channel Bragg cell. In effect, the multi-channel array of transducers of a Bragg cell forms a composite N-channel transducer the width of which is N times the spacing between channels. For a CW radiation source, the signal received by each array element undergoes an incremental phase shift associated with the tilt of the phase front across the array. When these signals are used to drive respectively adjacent transducers of a multi-channel Bragg cell, the acoustic effect within the bulk is equivalent to that of driving a large composite transducer with a constant frequency signal. This larger size of the effective composite transducer provides significantly reduced divergence of the composite acoustic wave, while the linear phase shift across the transducer results in a tilting of the composite acoustic wave. The two-dimensional acoustic wave modulation of a light beam passing through the Bragg cell is then imaged in the transform plane of a downstream Fourier transform lens, so as to produce a two-dimensional Fourier transform of the Bragg cell. In the transform plane there is provided a frequency display in the horizontal (parallel to the direction of travel of acoustic waves in the Bragg cell) direction and an angle of arrival (azimuth angle) display in the vertical direction. Multiple radiation sources at different locations may be processed independently through superposition | Moore George S. (Colorado Springs, CO) | Harris Corp. (Melbourne, FL) | 18.12.1986 | 31.01.1989 | G01S13/28, G01S3/74, G01S13/00, G01S13/42, G01S3/02, G01J009/68, G01S3/74, G01S13/28, G01S13/42 | 06/943171 |
| 201 | 4800388 | Apparatus for measuring pulse compression ratio | An apparatus for measuring pulse compression ratio which receives a pulse compression radar signal that has been phase-modulated by a two-phase code. The apparatus comprises a means for detecting a function of the number of times of phase inversion existing in the received pulse compression radar signal to obtain the pulse compression ratio corresponding to the function of the number of times of phase inversion | Okada Kozo (N/A, JP) | Tokyo Keiki Company, Ltd. (Tokyo, JP) | 06.02.1985 | 24.01.1989 | G01S13/28, G01S7/02, G01S13/00, G01S013/28, G01S7/021, G01S13/288 | 06/699154 |
| 202 | 4772889 | Device for calculating a discrete fourier transform and its application to pulse compression in a radar system | A device for calculating a discrete, moving window and non-recurrent Fourier transform, especially applicable to the processing of a pulse compression radar signal. The device includes N stages which, on the basis of samples of the input signal, each give a signal of the form: ##EQU1## where k is the index of the stage (O<:k<:N), m the index of the window and N the number of samples in the window, N being a multiple of four. The complex rotations of the expressions (1) and (3) are each broken down into a rotation in the first quadrant of the complex plane, a rotation common to N stages and a supplementary rotation specific to each stage, achieved by addition-subtraction | Elleaume Philippe (Antony, FR) | Thomson-CSF (Paris, FR) | 15.10.1986 | 20.09.1988 | G01S13/28, G01S13/00, G06T9/00, G06F17/14, G01S007/44, G01S13/284, G06F17/142, G06T9/007 | 06/919163 |
| 203 | 4758839 | Terrain profile radar system | Stable measurement of terrain-height variations is provided by this radar system which employs a very low power spread spectrum transmitted signal which, after reception, is processed digitally for extremely stable and predictable performance. The system also includes an automatic power control circuit to maintain the transmitted power at the minimum required level | Goebel Robert H. (St. Louis County, MO), Fogle Dale A. (St. Louis County, MO) | McDonnell Douglas Corporation (Long Beach, CA) | 22.07.1987 | 19.07.1988 | G01S13/28, G01S13/89, G01S13/00, G01S7/40, G01S13/02, G01S13/88, G01S013/08, G01S7/4008, G01S13/288, G01S13/89, G01S13/882, G01S2013/0281 | 07/076480 |
| 204 | 4749950 | Binary power multiplier for electromagnetic energy | A technique for converting electromagnetic pulses to higher power amplitude and shorter duration, in binary multiples, splits an input pulse into two channels, and subjects the pulses in the two channels to a number of binary pulse compression operations. Each pulse compression operation entails combining the pulses in both input channels and selectively steering the combined power to one output channel during the leading half of the pulses and to the other output channel during the trailing half of the pulses, and then delaying the pulse in the first output channel by an amount equal to half the initial pulse duration. Apparatus for carrying out each of the binary multiplication operation preferably includes a four-port coupler (such as a 3 dB hybrid), which operates on power inputs at a pair of input ports by directing the combined power to either of a pair of output ports, depending on the relative phase of the inputs. Therefore, by appropriately phase coding the pulses prior to any of the pulse compression stages, the entire pulse compression (with associated binary power multiplication) can be carried out solely with passive elements | Farkas Zoltan D. (Menlo Park, CA), Family ID | --- | 14.03.1986 | 07.06.1988 | G01S13/28, G01S13/00, H03K5/06, H03K5/04, H03K003/01, G01S13/288, H03K5/065 | 06/839851 |
| 205 | 4745321 | Reflective array surface acoustic wave device | A reflective array surface acoustic wave signal compressor or expander (RAC) has a piezoelectric substrate (LiNbO.sub.3) upon which is deposited an input transducer and an output transducer and etched therein a reflective grating. The RAC grating comprises reflective elements which includes a plurality of grooves having either uniform depths and lengths and preselected widths or uniform depths, lengths and widths for producing a flat pass band or a desired frequency characteristic. Yields are increased owing to the simplified fabrication process and costs decreased owing to batch fabrication made possible by the resulting simplified fabrication-process | Raschke Curt R. (Dallas, TX) | Texas Instruments Incorporated (TX) | 18.02.1987 | 17.05.1988 | G01S13/28, G01S13/00, H03H9/00, H03H9/44, H03H9/02, H01L041/08, G01S13/282, H03H9/02653, H03H9/02811, H03H9/44 | 07/016526 |
| 206 | 4739186 | Frequency-selectable pulsed-sinusoid generation system | A system for generating a sequence of pulses of carrier having individually selectable frequencies employs a pulsed oscillator for providing a single pulse of a carrier signal having a predetermined frequency. The single pulse is applied to a dispersive filter imparting a delay to signals dependent of their spectral content. The relatively broad spectrum of the single pulse is converted by the dispersive filter into a swept frequency pulse of much longer duration than the input pulse to the filter. The expanded signal is mixed with a set of mixing frequencies to provide a set of expanded signals, each of which is then gated to attain spectral portions having desired average values of frequency. The expanded signals are then summed together and applied to a compressive filter which operates in the mirror-image format to the dispersive filter. The compressive filter compresses each of the pulses of the expanded signals to a narrow pulse signal, the compressive filter outputting a succession of compressed pulses having carrier frequencies corresponding to those selected during the gating of the expanded signals | Crookshanks Rex J. (Palos Verdes, CA) | Hughes Aircraft Company (Los Angeles, CA) | 18.08.1986 | 19.04.1988 | G01S13/28, G01S13/00, H04B1/713, H04B1/69, H04B017/00, G01S13/286, H04B1/7136, H04B2001/71362 | 06/897558 |
| 207 | 4734699 | Doppler-improved polyphase pulse expander-compressor | A method and apparatus for reducing cyclic losses due to doppler shifting frequency-derived phase coded expanded radar pulses using new expanded pulse codes which increase the number of phase elements without increasing compression ratios. These new expanded codes may be generated by sampling the phase characteristics of a chirp or step-chirp waveform above the Nyquist rate to derive the phases of the new coded waveforms and compressing the new expanded pulses with a compression ratio equal to the reciprocal of the signal bandwidth | Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 07.04.1986 | 29.03.1988 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/848880 |
| 208 | 4731612 | Method and apparatus for eliminating short pulses in a doppler radar | A doppler radar arrangement that is able to reject short pulses. It does so by comparing the modulus of a difference vector with the same parameter during the preceding PRI. Information corresponding to "No short pulse" or to "Short pulse detected" is stored during each pulse repetition interval. The short pulse signal is replaced by the preceding signal in the same range gate only once by comparing the stored information relating to the current i.sup.th PRI and to the preceding i-1.sup.th and i-2.sup.th PRI | Chalard Claude A. (Montigny Le Bretonneux, FR), Trilles Christian F. H. (Velizy-Villacoublay, FR) | Laboratoire Central de Telecommunications (Velizy Villacoublay, FR) | 27.01.1984 | 15.03.1988 | G01S13/28, G01S13/00, G01S7/292, G01S007/30, G01S007/44, G01S7/2928, G01S13/28 | 06/588935 |
| 209 | 4723125 | Device for calculating a discrete moving window transform and application thereof to a radar system | A device for calculating a discrete moving window Fourier transform. It comprises an assembly of circuits receiving samples of the input signal (E.sub.m+n), the output signal of this assembly (.delta..sub.m) being applied to a plurality of N identical and parallel stages (E.sub.k). The assembly of circuits comprises a shift register conferring a delay of N sampling periods on the incident signal and an adder performing the subtraction: of the input and output signals of the shift register. Each of the N stages delivers a signal in the form | Elleaume Philippe (Antony, FR) | Thomson-CSF (Paris, FR) | 26.06.1986 | 02.02.1988 | G01S13/28, G01S13/00, G06F17/14, G01S007/44, G01S13/284, G06F17/141 | 06/878891 |
| 210 | 4719468 | Radar system with reduced distance error | In a radar system comprising equipment for transmitting frequency modulated pulses and compressing the received signals in a filter for frequency-dependent weighting, the weighting is asymmetrical in a manner such that the leading sidelobes of the pulse compression signal are reduced and the lagging sidelobes are raised. The reduced leading sidelobes can easily be reduced below an amplitude threshold so that the main echo lobe within the pulse compression signal is reliably acquired for determining the closest target distance. The invention may advantageously be applied to ground tracking radars | Jehle Franz (Ulm, DE), Mutschler Jurgen (Ulm, DE) | Licentia Patent-Verwaltungs-GmbH (DE) | 09.05.1985 | 12.01.1988 | G01S13/28, G01S13/00, G01S007/28, G01S13/282 | 06/732428 |
| 211 | 4704737 | Compressive receiver having pulse width expansion | A broadband receiver for converting an input radio frequency signal into output pulses includes provision for expanding the width of the output pulses (50) to permit pulse processing by conventional equipment at slower processing rates. A scanning local oscillator (42) frequency modulates the input signal to create a frequency modulated signal which is compressed into a pulse by a dispersive delay line (40). The width of the output pulse is increased by producing a mismatch or differential in the frequency versus time slopes (52, 54) of the oscillator and dispersive delay line. The slope differential is achieved by a function generator (58, 68) which maintains the frequency versus time slope of the scanning local oscillator at a value different than that produced by the dispersive delay line | Estrick Vaughn H. (Fullerton, CA), Guadagnolo Robert N. (Burbank, CA) | Hughes Aircraft Company (Los Angeles, CA) | 27.09.1985 | 03.11.1987 | G01S13/28, G01S13/00, G01R23/175, G01S7/02, G01R23/16, H03K5/06, H04K3/00, H03K5/04, G01R023/175, G01S007/02, H03K005/06, H04K003/00, G01R23/175, G01S7/02, G01S13/282, H03K5/06, H04K3/45, H04K3/82 | 06/781288 |
| 212 | 4698827 | Generalized polyphase code pulse compressor | A decoding device for use in pulse compression radars to decode a novel pe code that has the advantage of precompression bandwidth tolerance. The novel code type is described by the following formula (where .DELTA..phi..sub.k,p is the phase change at the kth subpulse of the pth subsequence within the width of a phase-modulated pulse): k=0, 1,2, . . . , N-1 p=0, 1,2, . . . , N-1 (N any integer) The input signal is fed into multi-stage I and Q shift registers. Each stage in the shift register is fed into an adder, correlation being effected by first multiplying the real and quadrature parts of the signal stored in the stages of the I and Q shift register by a preselected multiplying factor, the sequence of multiplying factors corresponding to the time-reversed and negative phases of the transmitted pulse. The sum signal at the output of the adder corresponds to the auto-correlation function of the received signal | Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 27.11.1981 | 06.10.1987 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/325454 |
| 213 | 4688043 | High resolution radar system | A radar system for tracking airborne targets, in which the transmitted pulse signal is swept over a predetermined frequency range (3). A local oscillator (15) in the receiver is swept over a similar frequency range the L.O. sweep modulation being initiated (20) by the first significant target return signal. Reflectors on the target at different ranges therefore produce different I.F.s in the receiver. Discrimination between the various target reflector features is thus achieved by filtering (25, 27, 29) the I.F. signals in a series of small bands, each band corresponding to a particular target-feature range. Azimuth, elevation and magnitude of a target feature can thus be obtained for each range cell | Welsh John (Hertfordshire, GB2) | Marconi Avionics Limited (GB2) | 28.04.1982 | 18.08.1987 | G01S13/28, G01S13/44, G01S13/00, G01S7/41, G01S13/68, G01S7/02, G01S013/44, G01S7/411, G01S13/282, G01S13/4445, G01S13/685 | 06/374708 |
| 214 | 4679210 | Soft-limited digital pulse compressor | A circuit is provided for correlating both the phase and amplitude of received radar signals with the phase of a transmitted binary reference phase code, which enables implementation by off-the-shelf hardware. The received signal is demodulated and quadrature detected, and each segment of small duration of the received signal is converted to a three-bit data code word, with each data word defining both the phase and the amplitude of the demodulated received signal. Each bit of the same significance (e.g., most significant bit or least significant bit) of a series of data words is delivered to a different one of a group of one-bit correlators. Each correlator correlates the series of bits of the same significance from a sequence of data words, with the bits of the binary reference phase code. The outputs of the correlators whose bits represent the amplitude of the received signal, are multiplied according to the significance or position of the bit, and the products are added | Rathi Devdas D. (Los Angeles, CA) | ITT Gilfillan, a division of ITT Corporation (Van Nuys, CA) | 18.07.1985 | 07.07.1987 | G01S13/28, G01S13/00, G06F015/34, G01S13/288 | 06/756480 |
| 215 | 4674104 | Circuit arrangement for the regulation of a multichannel pulse compression system | A type of transmitter, that transmits an unexpanded continuous unmodulated signal following a predetermined number of transmission pulses, is disclosed for the regulation of a multichannel pulse compression system. At least two compression channels are available which are inserted between a microwave receiver stage and a demodulator. A respective monitoring signal is extracted from the output of each compression channel and these phase difference signal and an amplitude difference signal. A respective a phase shifter and an attenuation circuit, which are provided in at least one of the compression channels, in such a manner that the phase difference signal and the amplitude difference signal are compensated towards zero | Bachtiger Rolf (Oberwil, CH) | Siemens-Albis Aktiengesellschaft (Zurich, CH) | 19.02.1986 | 16.06.1987 | G01S13/28, G01S13/44, G01S13/00, H04L027/00, G01S13/282, G01S13/4436 | 06/830765 |
| 216 | 4673941 | Digital pulse compression filter | A digital pulse compression filter for use in a radar or sonar transmitting and receiving unit to process sampled and digitized signals. The sampling frequency (f.sub.s) is equal to about four times the center frequency (f.sub.o) and greater than about twice the bandwidth (.DELTA.f) of these signals. The pulse compression filter (5) comprises a time correlation circuit (7) supplied on the one hand with the sampled and digitized signals and on the other hand with signals representing a replica of the radar or sonar transmitter pulse, whereby one of the two types of signals supplied to the correlation circuit (7) is correlated with the orthogonal components of the other type of signals supplied to the correlation circuit (7) to obtain the orthogonal components of the compressed pulse | Van Der Mark Jacobus (Apeldoorn, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 19.11.1984 | 16.06.1987 | G01S13/28, G01S13/00, G01S7/285, G01S7/288, H03H017/00, G01S007/28, G01S7/288, G01S13/282 | 06/672517 |
| 217 | 4661819 | Doppler tolerant binary phase coded pulse compression system | A Doppler tolerant binary phase coded pulse compression system. An input pulse is converted to a binary coded sequence of pulses according to a phase code. The sequence of pulses is used to frequency code a transmitted carrier. Echo returns are demodulated and supplied to a matched filter for comparison to the binary phase code to detect targets in the echo returns. The detection of targets is independent of target speed. In an alternative embodiment, the binary coded sequence of pulses is used to amplitude code a transmitted carrier. Echo returns are then demodulated and processed in the matched filter to detect targets independently of target speed | Lewis Bernard L. (Fort Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 12.05.1983 | 28.04.1987 | G01S13/28, G01S13/00, G01S013/28, G01S13/284, G01S13/288 | 06/493831 |
| 218 | 4626854 | Method and apparatus for generating a modified P.sub.1 code | A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor employs a discrete Fourier transform circuit and multi-stage delay line feeding inputs x(n) to the discrete Fourier transform circuit to generate outputs in accordance with the formula where n is the sequence number of the clock pulse: N is an even integer corresponding to the number of delay stages plus one and k is the number of the output subpulse from the transform circuit. An arrangement of delay stages differentially delays the output subpulses from the discrete Fourier transform circuit, and a coherent summer adds the real and imaginary parts of the signals from the delay lines. The delay stages delay the subpulse F.sub.k by nN clock pulse intervals where n and k are interrelated by the formulae k=N/2-n for n=0, 1, . . . , and N/2 and k=(3N/2)-n for n=N/2+1, N/2+2, . . . , N-1. The pulse expander-compressor generates a modified, N.sup.2 element P1 polyphase code that is tolerant to receiver bandwidth limitations | Kretschmer, Jr. Frank F. (Laurel, MD), Lewis Bernard L. (Fort Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 14.09.1983 | 02.12.1986 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/532114 |
| 219 | 4626853 | Pulse compression radar signal processor | A pulse compression signal processor suitable for use in a phase-coded, pulse compression radar for decoding the phase coded radar return pulses to enhance the resolvability of objects in range is disclosed. The pulse compression signal processor includes a conventional correlation processor operative in accordance with an initial filter function to convert a signal representative of the phase-code of the transmittal RF pulse to effect the range correlation response thereof. The resulting range correlation response is modified in accordance with a desired range correlation response. Both the phase code representative signal and the desired range correlation response signal are converted by fast Fourier transformations into their corresponding frequency domain signals which are divided to effect a desired filter function signal for use in decoding the phase-coded radar return pulses to effect substantially the desired range correlation response thereof. The pulse compression signal processor further includes an interative process to truncate the desired filter function signal in time in accordance with pre-established criteria | Lee Henry E. (Columbia, MD), Seldes Michael B. (Rockville, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 20.07.1984 | 02.12.1986 | G01S13/28, G01S13/00, G01S007/28, G01S013/28, G01S13/288 | 06/632979 |
| 220 | 4620112 | Chirp signal gating circuit for expander in a pulse compression radar system | A gating arrangement for a pulse compression circuit includes a surface acoustic wave delay line SAW responsive to an input pulse to generate a frequency-modulated radio-frequency output signal which is applied to an output gate OG. The output signal is also applied to circuit means DC operable to product a digital pulse corresponding to each cycle of the output signal. The pulses are counted by a counter CT and applied to control means CM. This responds to first and second predetermined counter states to control the operation of the output gate OG | McPherson Hugh (Tweeddale, GB6), Blakely John P. (Edinburgh, GB6) | FERRANTI plc (Cheshire, GB2) | 06.10.1983 | 28.10.1986 | G01S13/28, G01S13/00, H03K017/56, H03K017/29, H03K021/09, G01S13/282 | 06/539559 |
| 221 | 4605922 | Intrusion detector | An intrusion detector system with a transmitter having a clock operating at a selected frequency, a pseudorandom code sequence generator for generating one of a selected number of codes, a modulator for spread-spectrum modulating an electromagnetic signal with the generated pseudorandom code sequence signal, and an antenna for transmitting the modulated signal through a zone of protection: and a receiver having an antenna, a demodulator for detecting and demodulating the modulated signal to recover the transmitter pseudorandom code sequence signal, a clock operating at a frequency corresponding to the transmitter clock, a pseudorandom code sequence generator for generating one of a selected number of receiver code signals corresponding to the transmitter code signals, a detector for comparing the received code signal to the receiver code signal and generating a detection signal proportional to the signal amplitude of the received code signal when locked in phase with the receiver code signal, a phase detector for detecting the phase difference between the two code signals, a control for phase synchronizing the two code signals, and a monitor for detecting and signalling changes in the detection signal resulting from entry of movement of an intruder in the zone of protection | Blattman Daniel A. (King County, WA), Middleton Harold G. (King County, WA) | Racon, Inc. (Seattle, WA) | 14.09.1984 | 12.08.1986 | G01S13/28, G01S13/00, G01S13/04, G08B013/18, G01S13/003, G01S13/04, G01S13/284 | 06/650820 |
| 222 | 4604622 | Proximity radar | A proximity radar is described in which a signal phase modulated in accordance with a pseudorandom sequence is transmitted from an antenna, and a return signal reflected from a target is received by this antenna. The return signal is correlated with a signal identical to the transmitted signal but delayed by a selected time interval. The delay imposed on the transmitted signal as fed to the correlator is alternately given the two values n.t and n'.t where n' is less than n and the time interval n.t corresponds to the time taken by the signal to travel to and return from the target when the radar is at a predetermined distance from the target, which distance is to be detected. The correlator output is fed through an amplifier circuit including an automatic gain control circuit when the delay is n'.t and the automatic gain control circuit is inoperative when the delay is n.t | Delon Patrice C. G. (Neuilly, FR), Fourreaux Gerard D. (Chatou, FR), Nicolas Michel J. R. (Paris, FR), Sebilet Bruno R. (Suresnes, FR) | Societe Nationale d'Etude et de Construction de Moteurs d'Aviation (Paris, FR) | 25.05.1983 | 05.08.1986 | F42C13/04, F42C13/00, G01S13/28, G01S13/00, G01S13/18, G01S013/32, F42C13/042, G01S13/18, G01S13/288 | 06/498162 |
| 223 | 4591857 | Programmable LFM signal processor | The linear frequency modulation (LFM) signal processor may be programmed to be a matched filter for any pulse compression (PC) ratio less than or equal to the square of the number of bandpass filters. The processor is implemented by using a fast Fourier transform (FFT) for the filter bank. The implementation shown assumes digital processing at baseband using in-phase and quadrature (I and Q) channels and an FFT for the filter bank. The I and Q channels are fed through a sidelobe filter, a short input tapped delay line, and a set of M complex multipliers to the FFT. The FFT outputs are connected to a long tapped delay line through a second set of complex multipliers whose outputs are summed in the long tapped delay line summer | Thor Robert C. (Liverpool, NY) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 11.07.1983 | 27.05.1986 | G01S13/28, G01S13/00, G01S013/28, G01S13/282 | 06/512848 |
| 224 | 4580139 | Waveform design for optimized ambiguity response | This is a method of waveform design and range correlator implementation t uses weighting to optimize a radar receiver's ambiguity response in both the temporal and frequency dimensions of the ambiguity function. It is an extension of group-complementary code structure and is based on a multipulse processing technique. The procedure minimizes frequency sidelobes over a selected interval in the spectral domain between dc and the pulse repetition frequency and completely eliminates temporal sidelobes throughout the pulse repetition interval. It minimizes clutter and multitarget interference in an active-sensor target acquisition and tracking application, and still allows weighting of the pulse responses to reduce frequency domain sidelobes | Weathers Glenn D. (Huntsville, AL), Holliday Edward M. (Huntsville, AL), Green, Jr. Augustus H. (Huntsville, AL) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 22.06.1983 | 01.04.1986 | G01S13/28, G01S13/00, G01S007/30, G01S13/284 | 06/506934 |
| 225 | 4578677 | Range doppler coupling magnifier | A pulse expander-compressor for magnifying the range-doppler-coupling effs that accompany the use of frequency-modulation derived phase coded effects on target echoes. The foregoing magnification is accomplished by generating a doppler tolerant polyphase coded waveform with equal time difference between the first and last code elements independent of the number of code elements involved. These equal spaces may be variable in difference between the first and last code elements of 2.pi.. The foregoing may be implemented in a pulse expander-compressor by replacing each delay t.sub.c in the compressor input-signal expansion circuit by a set of N delay elements t.sub.c, and a set of N associated switches, the switches permitting each element in the set to be connected or bypassed, as desired. The time-dispersion circuit for the compressor is likewise modified by replacing each of its Mt.sub.c delays by a set of N delay elements Mt.sub.c, each of which is independently connectable or bypassable | Lewis Bernard L. (Ft. Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 23.09.1983 | 25.03.1986 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/535085 |
| 226 | 4566760 | Multi-product acousto-optic time integrating correlator | A device for processing signals to obtain a multi-product, time integrated, correlated output signal. A laser light beam is expanded and shaped into a sheet beam which is directed across the surface of an acousto-optic medium. Four acoustic transducers are disposed on the acousto-optic medium, two at each end of the medium. Each acoustic transducer is supplied with a signal to be propagated on the surface of the acousto-optic medium. The first two signals diffract the sheet beam to produce a first, product diffracted beam of light containing the product of the first two signals. The second two signals diffract the sheet beam to produce a second product diffracted beam of light containing the product of the second two signals. The two product diffracted beams are rotated so that they are orthogonal to each other, and then combined. A time integrating photodetecting means is disposed in the path of the combined beam for generating a multi-product, time integrated, correlated output signal | Abramovitz Irwin J. (Baltimore, MD), Berg Norman J. (Baltimore, MD), Casseday Michael W. (Washington, DC) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 12.04.1984 | 28.01.1986 | G01S13/28, G02F1/01, G01S13/00, G02F1/11, G06E3/00, G02F001/33, G06G009/00, G01S13/28, G02F1/11, G06E3/005 | 06/599365 |
| 227 | 4566011 | Palindromic polyphase code expander-compressor | A digital pulse expander-compressor for generating polyphase coded pulses which are highly doppler tolerant and have autocorrelation functions which are identical under frequency sweep reversal. The expander-compressor comprises an input expansion circuit for generating N replicas of a pulse to be expanded, a matched filter FFT with phase weights disposed in each input thereto, and phase inverters disposed in every other output therefrom, and a time dispersion circuit for appropriately adding the pulses from the FFT output to yield an expanded or compressed pulse. The phase weights to be inserted at the inputs to the FFT are determined by the equation .phi..sub.n =.+-..pi.(n-1/2).sup.2 /.rho. for a PP-3 code or .phi..sub.n =.+-.[.pi.(n-1/2).sup.2 /.rho.-.pi.(n-1/2)] for a PP-4 code, where .rho. is the pulse compression ratio and n varies from 1, 2, 3 . . . .rho. | Lewis Bernard L. (Fort Washington, MD), Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 08.07.1983 | 21.01.1986 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/512045 |
| 228 | 4566010 | Processing arrangement for pulse compression radar | An arrangement is shown to process mainlobe echo signals and range sidelobe signals in the receiver of a pulse compression radar by first converting such signals to a set of digital numbers and then correlating, number by number, such set with a set of reference numbers describing the mainlobe echo signals and the negative of selected range sidelobe signals | Collins John D. (Burlington, MA) | Raytheon Company (Lexington, MA) | 28.04.1982 | 21.01.1986 | G01S13/28, G01S13/00, G01S013/26, G01S13/288 | 06/372517 |
| 229 | 4562438 | Radar apparatus | A radar transmitter transmits a group of pulses as shown at I of FIG. 2, the group consisting of first short pulse of a frequency f.sub.1 transmitted during time interval t.sub.1 to t.sub.2. A second, longer pulse of frequency f.sub.2 is transmitted during time interval t.sub.2 and t.sub.3 and a third, short pulse of frequency f.sub.1 is transmitted during time interval t.sub.3 to t.sub.4. The return from a close range small target is shown at II and the return from a large source of clutter or another large target at a slightly greater range is shown at III. The return from the larger target or source of clutter is so strong as to saturate the receiver during the time interval t.sub.7 to t.sub.12 and thus the return from the second short pulse during period t.sub.9 to t.sub.10 is obscured as shown at IV. However, since a short pulse is also transmitted before the long pulse its return, at time interval t.sub.5 to t.sub.6, is not obscured. In other situations where a large source of clutter or a large target is at a slightly closer range than the small target of interest the return during interval t.sub.5 to t.sub.6 will be obscured but the return of the second pulse during time interval t.sub.9 to t.sub.10 will not be obscured. In this way it is ensured that at least one of the two short pulses is detected | Rouse David G. (Halstead, GB2), Wilkinson Christopher F. (Hungarton, GB2) | The Marconi Company Limited (Chelmsford, GB2) | 24.09.1981 | 31.12.1985 | G01S13/28, G01S13/10, G01S13/30, G01S13/00, G01S007/28, G01S013/28, G01S13/106, G01S13/282, G01S13/30 | 06/305343 |
| 230 | 4560961 | Method and means for generating pulse compression pulses | A system and method for generating phase/frequency coded pulses useful in radar and similar applications, (such as simulation of multiple return of targets) by generating frequency modulated pulse compression pulses rapidly with practically no time in between. Typically, the system simulates target returns as FM sweeps or chirps to obtain an echo of a transmitted pulse having a known signature. Digital circuits are employed with finite steps connected to a digital-to-analog converter driving a radio frequency balanced modulator, to produce the desired chirp output. The system generates FM phase modulations by reading two phase history records representing cosine and sine functions in phase quadrature of a to-be-transmitted pulse | Kestenbaum William W. (Lido Beach, NY) | Republic Electronics, Inc. (Melville, NY) | 26.01.1983 | 24.12.1985 | G01S13/28, G01S13/00, G01S7/40, H03C003/00, G01S7/4052, G01S13/282 | 06/461118 |
| 231 | 4532603 | Chirp transform correlator | A chirp transform correlator having asynchronous operation is made possible by the use of a pair of paralleled signal processing channels to which the unknown signal to be correlated is applied. The two channels include sweeping local oscillators which are interlaced in timing so that any arbitrarily timed unknown input signal will be fully transformed by one or the other of the channels | Gerard Henry M. (Capistrano Beach, CA) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 09.03.1983 | 30.07.1985 | G01S13/28, G01S13/00, G06G7/19, G06G7/00, G06G007/19, G01S13/282, G06G7/1928 | 06/473467 |
| 232 | 4524363 | P2 Polyphase code expander-compressor | A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed by way of respective phase weights and for which every frequency port is phase-shifted prior to entry to a time-dispersion-means (TDM) comprising an arrangement of delay stages for differently delaying the output signals from the DFT. The TDM output is fed to a phase modulator and then to the transmitter. The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal by way of the phase weights. The outputs of the DFT are then phase-shifted at every frequency port and passed through fed through an envelope detector to provide a cross-correlated facsimile of the original input pulse | Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 11.05.1982 | 18.06.1985 | G01S13/28, G01S13/00, G01S013/28, G06F015/332, G01S13/288 | 06/377108 |
| 233 | 4524362 | Phase coded pulse expander-compressor | A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed by way of respective phase weights and for which every other frequency port is inverted prior to entry to a time-dispersion-means (TDM) comprising an arrangement of adders interconnected by delay stages for differently delaying the output signals from the DFT. The TDM output is fed to a phase modulator and then to the transmitter. The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal by way of the phase weights. The outputs of the DFT are then inverted at every other frequency port and passed through fed through an envelope detector to provide a cross-correlated facsimile of the original input pulse | Lewis Bernard L. (Fort Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 11.05.1982 | 18.06.1985 | G01S13/28, G01S13/00, G01S013/28, G06F015/332, G01S13/288 | 06/377107 |
| 234 | 4524361 | Radar systems employing two kinds of pulses | In a radar system frequency-modulated transmitter pulses of relatively long duration and frequency-modulated transmitter pulses of relatively short duration are generated and transmitted through a common transmitter channel, both channels containing a pulse compression filter, for the detection of return signals from the transmitter pulses of relatively long duration and of relatively short duration respectively | Teulings Wilhelmus A. (Haaksbergen, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 29.04.1982 | 18.06.1985 | G01S13/28, G01S13/30, G01S13/00, G01S013/28, G01S13/282, G01S13/30 | 06/372884 |
| 235 | 4521779 | Pulse compression system | A system for polyphase encoding transmitted pulses of energy and for decog the received signals to enhance returns from the range interval being examined during a particular processing period and attenuate returns from contiguous range intervals (pulse compression). The system includes a decoding device which comprises a delay circuit having N distributed outputs including its input for producing a uniform delay between adjacent outputs corresponding to N inputted elements of a received phase-coded signal of length N.sup.2 : a conjugator circuit coupled to the first N/2 successive outputs of the delay circuit: a first signal-combining circuit coupled to the conjugator circuit and to the last N/2 successive outputs of the delay circuit: a multiplier circuit coupled to the first signal-combining circuit: and a second signal-combining circuit coupled to the multiplier circuit. The decoding device provides a decoding phase shift -.DELTA..phi..sub.k,p to the signal elements of the phase-coded signal wherein is the phase of the pth code element in the kth subgroup and k=0,1,2, . . . , N-1 and p=0,1,2, . . . , N-1, with N an even integer, and thereafter adds the phase-shifted signal elements at the same time to produce a narrow pulse with an accompanying increase in effective peak signal | Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 24.04.1980 | 04.06.1985 | G01R23/20, G01S13/28, G01S13/75, G01S13/00, G01S007/30, G01S013/52, G01R23/20, G01S13/288, G01S13/75 | 06/143399 |
| 236 | 4513289 | P1 Polyphase code expander-compressor | A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed by way of respective phase weights and for which every other frequency port is inverted prior to entry to a time-dispersion-means (TDM) comprising an arrangement of adders interconnected by delay stages for differently delaying the output signals from the DFT. The TDM output is fed to a phase modulator and then to the transmitter. The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal by way of the phase weights. The outputs of the DFT are then inverted at every other frequency port and passed through fed through an envelope detector to provide a cross-correlated facsimile of the original input pulse | Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 11.05.1982 | 23.04.1985 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/377106 |
| 237 | 4513288 | Group-complementary code sets for implementing pulse-compression processing with optimum aperiodic autocorrelation and optimum cross-correlation properties | A group-complementary codes provide sets of binary word groups which have the combined properties of optimized aperiodic autocorrelation and optimized cross-correlation between word sets. The optimized aperiodic autocorrelation property allows the implementation of pulse compression processing in sensor systems to achieve zero value temporal or range sidelobes within the principal interpulse period without resorting to weighting techniques for sidelobe reduction. The orthogonal nature of group-complementary codes, apparent from their absence of cross-correlation between sets, allows sensors to be deployed in close proximity, using the same carrier frequency without direct path mutual interference when synchronized | Weathers Glenn D. (Huntsville, AL), Holliday Edward M. (Huntsville, AL) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 29.03.1982 | 23.04.1985 | G01S13/28, G01S13/00, G01S007/28, G01S13/288 | 06/362934 |
| 238 | 4509051 | Phase-coded pulse expander-compressor | A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed by way of respective phase weights and for which every other frequency port is inverted prior to entry to a time-dispersion-means (TDM) comprising an arrangement of adders interconnected by delay stages for differently delaying the output signals from the DFT. The adders are where N is the number of frequency ports if that number is even, and N is the number of frequency ports less one if that number is odd. The TDM output is fed to a phase modulator and then to the transmitter. The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal by way of the phase weights. The outputs of the DFT are then inverted at every other frequency port and passed through the through an envelope detector to provide a cross-correlated facsimile of the original input pulse | Lewis Bernard L. (Fort Washington, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 20.09.1982 | 02.04.1985 | G01S13/28, G01S13/00, G01S013/28, G01S13/288 | 06/420209 |
| 239 | 4507659 | Pulse compression sidelobe suppressor | A method and apparatus for reducing the peak to peak-sidelobe ratio of the compressed pulse output signal of a symmetrical frequency derived phase coded pulse expander-compressor. The apparatus includes a bandwidth limiting device connected to the output of a symmetrical frequency derived phase coded pulse expander-compressor | Lewis Bernard L. (Ft. Washington, MD), Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 22.06.1983 | 26.03.1985 | G01S13/28, G01S13/00, G01S007/30, G01S13/288 | 06/506945 |
| 240 | 4472717 | Intrapulse polarization agile radar system (IPAR) | This concept makes use of intrapulse polarization agility to achieve pulse ompression and correlation with the result that discrimination is accomplished between man-made-like objects and natural objects. A power divider allows the two power components to be simultaneously applied to a dual polarized antenna feed system and a phase detector provides bipolar video signals | Eaves Jerry L. (Mableton, GA), Appling Bobby C. (Orlando, FL) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 19.03.1982 | 18.09.1984 | G01S13/00, G01S7/02, G01S13/02, G01S13/28, G01S013/00, G01S7/024, G01S13/02, G01S13/288 | 06/359646 |
| 241 | 4443799 | Spread spectrum radar | A spread spectrum radar apparatus wherein a plurality of carrier signals frequency modulated over predetermined time intervals and separated in frequency such that the spectra of the signals do not overlap are sequentially transmitted. Radar returns of this transmission sequence are coupled to a receiver which is frequency band activated in accordance with the transmission sequence and in a manner to minimize radar minimum detection range. Each radar echo is processed through a matched filter for pulse compression, delayed in accordance with the position of its transmitted signal, detected, and non-coherently summed with detections of returns from the same target of other interval transmissions | Rubin William L. (Whitestone, NY) | Sperry Corporation (New York, NY) | 02.07.1981 | 17.04.1984 | G01S13/00, G01S13/28, G01S007/28, G01S13/286 | 06/279922 |
| 242 | 4404562 | Low sidelobe linear FM chirp system | An improved FM pulse compression system which has low range-time sidelobes nd is doppler tolerant. This system is implemented by using an analog-type linear FM modulated transmission pulse and processing the echo from this pulse by means of baseband sampling at the Nyquist sampling rate and then compressing this sampled signal by means of a discrete phase compression circuit. In brief, the present invention comprises a receiver for receiving the FM echo pulse, a sampling and holding circuit for sampling the echo at baseband at the Nyquist sampling rate and then converting to IF, and a discrete phase compression circuit for compressing the appropriate number of sampled outputs from the sampling and holding circuit. If an echo is properly indexed in the phase compression circuit, then a short pulse with a relatively high amplitude is generated | Kretschmer, Jr. Frank F. (Laurel, MD), Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 25.08.1980 | 13.09.1983 | G01S13/00, G01S13/28, G01S013/28, G01S13/282 | 06/180548 |
| 243 | 4384291 | Efficient low-sidelobe pulse compression | A pulse compression system for use with step approximation to linear FM and rank coded signals to eliminate sampling errors and range time grating lobes while providing large pulse compression ratios comprising:a receiving circuit for receiving echo signals, a converting circuit for converting echo signals from the receiver to I and Q baseband signals without clock sampling, a sliding window discrete Fourier Transform or fast Fourier Transform (FFT) circuit including a taped delay line and a plurality of resistor-type phase weighting networks and adders for generating a plurality of output signals representing the different frequency steps in the signals, a delay circuit for differentially delaying the output frequency steps from the sliding window DFT circuit so the the output steps occur simultaneously, and a summer for adding the differentially delayed outputs to yield a short pulse with a peak amplitude when a coded echo pulse is correctly indexed within the delay line of the DFT circuit | Lewis Bernard L. (Oxon Hill, MD), Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 15.04.1981 | 17.05.1983 | G01S13/00, G01S13/28, G01S013/28, G01S13/286 | 06/254311 |
| 244 | 4379295 | Low sidelobe pulse compressor | A pulse compression system based on the transmission of a step approximat to linear FM pulse, and the subsequent processing of echos therefrom by converting the echo pulses to I and Q baseband signals and then sampling these I and Q signals at the Nyquist sampling rate. It has been discovered that this processing yields a signal with a spectrum substantially identical to the spectrum of a properly sampled Frank coded pulse. These sampled I and Q signals are then compressed by a Fast Fourier Transform compressor to yield a pulse with low sidelobes | Lewis Bernard L. (Oxon Hill, MD), Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 03.02.1981 | 05.04.1983 | G01S13/00, G01S13/28, G01S013/28, G01S13/286 | 06/230984 |
| 245 | 4373190 | Efficient, precompression, bandwidth-tolerant, digital pulse expander-compressor | A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor exploys a discrete Fourier transform circuit and multi-stage delay line feeding inputs x(n) to the discrete Fourier transform circuit to generate outputs in accordance with the formula ##EQU1## where n is the sequence number of the clock pulse: N is the number of delay stages plus one: and k is the number of the output subpulse from the transform circuit. An arrangement of delay stages differentially delays the output subpulses from the discrete Fourier transform circuit, and a coherent summer adds the real and imaginary parts of the signals from the delay lines. The delay stages delay the subpulse s(k), O.ltoreq.k.ltoreq.N/2-1, by ##EQU2## clock pulse intervals, while delaying the subpulse s(k), N/2+1.ltoreq.k.ltoreq.N-1, by ##EQU3## clock pulse intervals. The subpulse s(k), k=N/2, is not used. The pulse expander-compressor generates and compresses a polyphase code pulse with a pulse compression ratio of M.sup.2 where M is an odd integer less than N. An odd integer is desired so that the code can be made to have conjugate symmetry about the zero modulation frequency code subsequence | Lewis Bernard L. (Oxon Hill, MD), Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 22.01.1981 | 08.02.1983 | G01S13/00, G01S13/28, G01S013/28, G01S13/288 | 06/227323 |
| 246 | 4359736 | Frequency-phase coding device | A doppler-tolerant pulse-compression code generator for generating a plurty of approximately orthogonal codes which will prevent radar interference and suppress jamming. These codes are generated by phase-coding the frequency-band steps and also altering the time-sequence of the frequency steps of a step-approximation to a linear FM chirp pulse. Specifically, this code generator may comprise a circuit for modulating a carrier frequency with a video pulse of bandwidth B having a length less than or equal to a desired compressed pulse length, a tapped delay line having n signal taps for sequentially delaying this video pulse, a comb filter comprising a series of n bandpass filter channels each passing different spectral bands in the bandwidth B, a switching matrix for connecting each of the n signal taps to a different one of the n bandpass filters in a controlled manner, a phase-coding circuit in each bandpass filter channel for phase coding the signal passed through the respective bandpass filter channel, and an adding circuit for adding all of the phase-coded signals from the n bandpass filter channels to form one of a set of orthogonally coded pulses | Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 24.11.1980 | 16.11.1982 | G01S13/00, G01S13/28, G01S7/36, G01S013/28, G01S7/36, G01S13/288 | 06/209370 |
| 247 | 4359735 | Multi-sampling-channel pulse compressor | A digital pulse compression processor for reducing the processing loss in rget-echo signals caused by sampling time errors comprising a first processing channel for sampling the echo signal in accordance with pulses from a first clock signal and a second processing channel for sampling the echo signal in accordance with pulses from a second clock signal at the same sampling frequency as the first clock signal but with its pulses interlaced, in time, approximately midway between the pulses of the first clock signal to ensure that the largest sampling error will be one-quarter of a sampling period or less. The sampled signals in each channel are then digitized and compressed, and then processed to form the compressed signal envelope. The resultant signal envelopes from each channel are multiplied together to form a low-sidelobe narrow output pulse | Lewis Bernard L. (Oxon Hill, MD), Kretschmer, Jr. Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 06.11.1980 | 16.11.1982 | G01S13/00, G01S13/28, G01S013/28, G01S13/282 | 06/206130 |
| 248 | 4353067 | Method of reducing side lobes of complementary coded pulses in a coherent pulse compression doppler radar receiving system | A method of processing doppler signal data to provide time and frequency (therefore phase) coincidence for complementary code pairs of a coherent, pulse compression radar using a weighting of every other echo pulse of a particular range cell to guarantee pulse compression sidelobe cancellation in accordance with complementary code theory | Mims James H. (Millersville, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 29.08.1980 | 05.10.1982 | G01S13/00, G01S13/28, G01S013/28, G01S13/284 | 06/182390 |
| 249 | 4333080 | Signal processor | A signal processor is disclosed wherein an intermediate frequency chirp pulse is pulse compressed and the linearly frequency modulated, intermediate frequency component of such compressed pulse is removed. With such an arrangement, various weighting techniques may be effectively used to reduce sidelobes of the compressed pulse while, in a radar system application, retaining the sense of the frequency of a Doppler shifted compressed pulse | Collins John D. (Burlington, MA), MacFall, Jr. Douglas S. (Winchester, MA), Sciarretta William A. (Lexington, MA) | Raytheon Company (Lexington, MA) | 18.07.1977 | 01.06.1982 | G01S13/00, G01S13/28, G01S013/28, G01S13/282 | 05/816422 |
| 250 | 4328495 | Unambiguous doppler radar | A digital pulse compression radar system with interrupted, phase coded, high duty ratio transmissions which allow contiguous range resolution cells to be established in coverage space and provide adequate airframe impulse excitation recovery time to render high duty ratio, phase coded, radar feasible for airborne applications. Each pulse is subdivided into a predetermined number of subpulses or bits, which are phase coded with (in-phase or out-of-phase) reference to a master oscillator. In the preferred embodiment, the code is built up from a PRN code staggered over .sup.2 n-1 pulses, each containing m resolution elements, where n is an arbitrary number designating the degree of the code and where m is an arbitrary number or is equal to the number of bits per pulse. The correlation properties of the code are such that when all bits of the returned pulses representing a word align with the delayed transmitted word, all bits add. When the bits do not align precisely, the bits generally cancel each other. Because of this, partial pulse overlaps do not produce a noticeable effect and ambiguity of the range is no longer limited by the time separation of adjacent pulses | Thue Baard H. (Lino Lakes, MN) | Honeywell Inc. (Minneapolis, MN) | 28.04.1980 | 04.05.1982 | G01S13/00, G01S13/28, G01S13/53, G01S013/28, G01S13/288, G01S13/53 | 06/144120 |
| 251 | 4315263 | Navigational systems using phase encoded angular coordinates | This invention generally relates to navigation systems which seek to position in real time with appropriate accuracy one or more mobile platforms in reference to a known system of coordinates by the emission of signals into a propagation medium and processing them after detection. Broad-band, broad-beam signals are employed. All received signals convey phase encoded angular coordinate information which characterizes the particular signal path. When the angular coordinate information is used in conjunction with range determinations from detected signals, an especially useful navigation system is provided which can operate using only a single reference station | Neidell Norman S. (Houston, TX), Family ID | --- | 18.09.1979 | 09.02.1982 | G01S13/00, G01S7/02, G01S7/527, G01S7/523, G01S3/00, G01S13/87, G01S3/80, G01S13/02, G01S15/00, G01S15/58, G01S13/28, G01S13/42, G01S7/41, G01S13/30, G01S15/10, G01S13/10, G01S7/292, G01S003/02, G01S3/80, G01S7/292, G01S7/41, G01S7/527, G01S13/02, G01S13/106, G01S13/28, G01S13/30, G01S13/42, G01S13/878, G01S15/108, G01S15/582 | 06/076695 |
| 252 | 4313170 | Autocorrelation side lobe reduction device for phase-coded signals | A pulse compression decoder which oversamples by two the signal elements of received phase-coded signal, performs a pairwise average on the signal elements at intervals equal to 1/2 the width of a signal element, reverse-codes the pairwise averages, combines the pairwise averages to form a sub-accumulation signal, and performs a pairwise average on the sub-accumulation signals at intervals equal to 1/2 the width of a signal element to produce a compressed pulse having a high peak-to-side lobe ratio | Lewis Bernard L. (Oxon Hill, MD), Kretschmer Frank F. (Laurel, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 23.06.1980 | 26.01.1982 | G01S13/00, G01S13/28, G01S009/233, G06F015/31, G01S13/288 | 06/162346 |
| 253 | 4309703 | Segmented chirp waveform implemented radar system | In a radar system utilizing same, a segmented chirp waveform is built up by frequency hopping trains of simple chirp pulses. Each chirp pulse in a train is identical and is transmitted on one of a set of discrete carrier frequencies. The carrier frequencies are uniformly spaced in a predetermined bandwidth and are used in linear sequence. After transmitting on the last carrier frequency, the entire pattern is repeated, starting again at the first carrier frequency. The returns from the individual pulses are digitized and stored and the history thereof is then assembled by a digital signal processor into a high resolution image | Blahut Richard E. (Owego Township, Broome County, NY) | International Business Machines Corporation (Armonk, NY) | 28.12.1979 | 05.01.1982 | G01S13/00, G01S13/28, G01S13/90, G01S007/28, G01S13/286, G01S13/90 | 06/107815 |
| 254 | 4308538 | AICBM Decoy resolution by coherent integration | A receiver in a radar system has two feed horns which supply a hybrid. The ybrid sums the amplitude of the signals from the feed horns at its first output and subtracts the signals at its second output. The outputs are each converted to I.F. by mixers, de-chirped, and then are coherently integrated. The integrated output of the difference is fed to a servo for tracking. The integrated output of the sum is fed through a control unit to control the beat signal of the mixers | Albersheim Walter J. (Waban, MA) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 22.03.1966 | 29.12.1981 | G01S13/00, G01S13/28, G01S13/44, G01S013/28, G10S013/44, G01S13/282, G01S13/4445 | 04/538167 |
| 255 | 4308473 | Polyphase coded mixer | A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate field effect transistors as the active elements | Carnes Irven S. (Chelmsford, MA) | Raytheon Company (Lexington, MA) | 21.02.1980 | 29.12.1981 | F42C13/00, F42C13/04, G01S13/00, G01S13/28, H03D7/14, H03B021/00, H03K017/16, H03K017/687, F42C13/042, G01S13/288, H03D7/1441 | 06/129456 |
| 256 | 4307399 | Circuit for detecting and homing on continuous wave radar targets | An apparatus for providing increased homing capabilities in a guided miss seeker against a continuous wave radar signal by compressing the received signal which effectively increases the received signal level by more than twenty decibels | Love Phillip A. (Riverside, CA), Borunda Gabriel S. (Riverside, CA) | The United State of America as represented by the Secretary of the Navy (Washington, DC) | 03.04.1967 | 22.12.1981 | G01S13/00, G01S13/28, G01S13/44, G01S013/28, G01S013/44, G01S13/282, G01S13/44 | 04/628806 |
| 257 | 4297702 | Polyphase coded fuzing system | A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of correlator/mixers, each one of the latter including dual gate field effect transistors as the active elements | Carnes Irven S. (Chelmsford, MA) | Raytheon Company (Lexington, MA) | 24.05.1978 | 27.10.1981 | F42C13/00, F42C13/04, G01S13/00, G01S13/28, G01S013/26, F42C13/042, G01S13/288 | 05/909098 |
| 258 | 4288750 | Surface acoustic wave time chirp devices | Surface acoustic wave dispersive delay lines provide a chirp signal generator and filter capable of producing signals of which the frequency-time slope can be varied. The chirp signal generator includes two surface acoustic wave delay lines, means for impulsing the delay lines with a variable relative time delay, and a mixer for combining the outputs of the two delay lines. The variable dispersion filter includes two delay lines, means for impulsing the delay lines with a variable relative time delay, a first mixer for combining an input signal with the output of one delay line and a second mixer for combining the output of the first mixer with the output of the other delay line. Variation in the time delay between the impulsing of the two delay lines produces a variation in the chirp rate at the output signal. The amplitude frequency characteristics of the signal generator and filter may be made non-linear by amplitude weighting one delay line | Newton Cleland O. (Malvern Wells, GB2), Paige Edward G. S. (Horton-com-Studley, GB2) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 30.04.1979 | 08.09.1981 | G01S13/00, G01S13/28, H03B23/00, H03K003/00, G01S13/282, H03B23/00, H03B2200/0092 | 06/034540 |
| 259 | 4267513 | Impulse generator apparatus | An impulse generator apparatus for a high resolution Chirp radar utilizing a fast settling time VHF oscillator in combination with a digital counter and a low phase distortion output filter to provide a sharp gated sinusoid impulse waveform to excite the receiver dispersive delay line | Driscoll Michael M. (Ellicott, MD), Lisle, Jr. Thomas K. (Baltimore, MD) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 07.09.1979 | 12.05.1981 | G01S13/00, G01S13/28, H03K3/282, H03K3/00, H03K003/01, G01S13/282, H03K3/2821 | 06/073479 |
| 260 | 4259650 | Sidelobe rejection filter | Disclosed is a Sidelobe Rejection Filter for reducing the time sidelobes seen in the auto-correlation output signals from a matched filter. Such matched filters are used with radars utilizing pulse compression techniques, for example. The sidelobe rejection filter may be utilized whenever the time response of the auto-correlation signals includes a plurality of sidelobes each having a period .tau. and having essentially the same amplitude. Accordingly, the disclosed sidelobe rejection filter is particularly useful for pulse compression radars employing linear FM (i.e., Chirp) or Barker phase coded waveforms. The matched filter includes a delay circuit coupled to receive the time response of the auto-correlation signal, which delay circuit inserts a delay of .tau., and a subtraction circuit for finding the difference between the delayed and undelayed time FM pulse compression techniques, the output of the subtraction circuit need merely be rectified to obtain an output signal whose sidelobes are substantially reduced in amplitude. In the case of phase coded pulse compression techniques using Barker codes, on the other hand, the output of the subtraction circuit is supplied to both positive and negative rectification circuits, one of whose outputs is then delayed by N.tau., where N is the number of bits in the Barker code. The output of the N.tau. delay circuit is well as the output of the other rectification circuit is then applied to an adder for further reducing time sidelobes. The output of the adder is applied to yet another rectification circuit for providing an auto-correlation response which is substantially free of time sidelobes | Donahue Thomas H. (Glendale, CA) | International Telephone and Telegraph Corporation (New York, NY) | 19.03.1979 | 31.03.1981 | G01S13/00, G01S13/28, H03H007/30, H03H007/01, G01S13/282, G01S13/288 | 06/021963 |
| 261 | 4237461 | High-speed digital pulse compressor | A pulse expansion and compression system, especially useful for radar ranging, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder consists of a plurality of delay stages into which the input pulse is fed, a discrete Fourier transform (DFT) circuit to which the output signals of the delay stages are fed, a time-dispersionmeans (TDM) comprising an arrangement of delay stages for differently delaying the output signals from the DFT, and a coherent summer for adding the real and imaginary parts of the signals from the TDM. The summer output is fed to a phase modulator and then to the transmitter. The echo signals are conjugated, time-inverted, and passed through the same DFT as the input pulse signal. The outputs of the DFT are then passed through a TDM of the same type as the first TDM, but this time in coherent summer and an envelope detector to provide a cross-correlated facsimile of the original input pulse | Cantrell Ben H. (Springfield, VA), Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 15.02.1979 | 02.12.1980 | G01S13/00, G01S13/28, G01S013/28, G01S13/288 | 06/012409 |
| 262 | 4216474 | Pulse frequency modulator and compressor for staircase FM radar systems | A pulse compression radar which transmits a step-wise FM pulse and correlates at the receiver using a bank of delay lines (having progressively increasing delays) of the fiber optic type. One such delay line corresponds to each step of the frequency modulation program transmitted. The summed delay line outputs converted to electrical signals are summed to provide the compression desired. A suitably amplified stair-step received echo signal is applied to control the deflection of a Bragg cell illuminated from a laser source, the variable light ray deflection produced by the Bragg cell being focused progressively at the input of each of the discrete fiber optic delay lines. The same bank of fiber optic delay lines is employed in an oscillator loop, these delay lines being effectively electronically switched into place sequentially in the frequency determining feedback loop of the oscillator circuit. The same or a different laser source floods all inputs of the fiber optic delay lines through a light modulator in the feedback path, the desired stair-step FM transmitted signal being a modulation on the light energy employed in the oscillator configuration. Time-sharing transmit/receive and light source wavelength/color separation embodiments are shown | Levine Arnold M. (Chatsworth, CA) | International Telephone and Telegraph Corporation (New York, NY) | 26.12.1978 | 05.08.1980 | G01S13/00, G01S13/28, H01Q3/26, G01S009/233, G01S13/28, H01Q3/2676 | 05/972709 |
| 263 | 4216433 | Threshold circuit | There is disclosed a threshold circuit for a long coded pulse having a given amplitude subdivided into a plurality of chips, each providing a code bit. A first circuit receives the coded pulse to compress the coded pulse into a shorter pulse of much greater amplitude than the given amplitude and to detect the compressed pulse. A second circuit also receives the coded pulse, detects the coded pulse and provides an amplitude threshold voltage. A third circuit coupled to the first and second circuits produces a finite output when the amplitude of the compressed pulse is greater than the amplitude of the threshold voltage and a zero output when the amplitude of the compressed pulse is less than the amplitude of the threshold voltage | LeGrand Jesse S. (Clifton, NJ) | International Telephone and Telegraph Corporation (New York, NY) | 13.01.1978 | 05.08.1980 | G01S13/00, G01S13/28, H03D003/00, H03K017/12, G01S13/284 | 05/869391 |
| 264 | 4196435 | Radar pulse phase code system | A radar system for reducing the effective width of a transmitted pulse without increasing power utilizing coded phase shifting. Discrete parts of the transmitted pulse are phase shifted 180.degree. and upon return to the receiver the pulse is decoded by a sequence of delay lines and phase shifters positioned in accordance with a predetermined code rendering all the discrete parts in phase which are then summed | Phillips, Jr. Calvert F. (Cape St. Claire, MD) | The United States of America as represented by the Secretary of the Air (Washington, DC) | 21.08.1967 | 01.04.1980 | G01S13/00, G01S13/28, G01S009/233, G01S13/288 | 04/662194 |
| 265 | 4194204 | High resolution microwave seeker | An active microwave seeker for missile guidance against ships or permanent and targets. Frequency agility and pulse time compression are employed as means to provide a capability for tracking small targets in heavy sea clutter, to reduce target angular scintillation, and to reduce susceptibility to enemy jamming. The seeker tracks a selected target in yaw and range, and keeps its antenna pointed toward the target in pitch by use of its own altitude control | Alpers Frederick C. (Riverside, CA) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 05.06.1972 | 18.03.1980 | G01S13/00, G01S13/24, G01S13/28, G01S13/44, G01S009/22, G01S009/233, G01S13/24, G01S13/28, G01S13/4427 | 05/260703 |
| 266 | 4167737 | Hybrid pulse compression system | A code generation and receiving system for a large bandwidth Doppler tolerant signal for use by communication and radar systems includes a set of delay lines for producing discrete phase shifts on a carrier signal. One delay line with relatively large delays between taps thereon produces a set of quadratic phase shifts approximating a frequency sweep. A second delay line with relatively small delays between taps thereon produces a binary phase code | Freedman Nathan (West Newton, MA) | Raytheon Company (Lexington, MA) | 09.01.1978 | 11.09.1979 | G01S13/28, G01S13/00, G01S009/233, G01S13/288 | 06/868107 |
| 267 | 4161732 | Gated pulse compression radar | A pulse compression coherent radar for obtaining target information is described wherein a pulse compression waveform having a predetermined bandwidth is gated at a frequency greater than the predetermined bandwidth to form a sequence of spaced apart pulses which are transmitted towards a target. A sequence of target reflected pulses are received during predetermined time intervals. The target reflected pulses of the sequence are compressed and then filtered to extract predetermined frequency components of the compressed signal. Alternatively, the target reflected pulses of the sequence are first filtered to extract predetermined frequency components and then compressed. In either embodiment, the output signal contains target doppler frequency and phase, range, and amplitude signature information. The gated pulse compression waveform may be for example a chirp or linear FM signal, phase coded signal, or pseudo noise coded signal | Longuemare, Jr. R. Noel (Ellicott City, MD) | Westinghouse Electric Corp. (Pittsburgh, PA) | 12.11.1976 | 17.07.1979 | G01S13/28, G01S13/00, G01S009/233, G01S13/282, G01S13/288 | 05/741439 |
| 268 | 4158840 | 3-D Radar comprising 2-D radar with height finding attachment | A radar with 3-D capability comprises a conventional 2-D radar with a height finding attachment. More particularly, a height finding antenna is mounted on the back surface of the conventional 2-D antenna reflector and points in a direction 180.degree. offset in azimuth from the direction of the 2-D antenna. An r-f transmitter with a linear frequency modulated output is coupled to the height finding antenna and controlled by a transmit control based on target range and azimuth data provided by the 2-D radar. The height finding pulse compression receiver also responds to this target information as well as the height finding return radar signal and extracts height information which is then made available to a suitable display | Schwab Carl E. (Huntington Station, NY) | General Signal Corporation (Rochester, NY) | 11.11.1977 | 19.06.1979 | G01S13/87, G01S13/28, G01S13/00, H01Q25/00, G01S007/20, G01S009/233, G01S13/282, G01S13/87, H01Q25/005 | 05/850528 |
| 269 | 4156876 | Autocorrelation sidelobe suppression device for a continuous periodic phase-coded signal | A device for suppressing autocorrelation sidelobes in a pseudo-random coded radar system employing a phase-coded CW signal in which the phase code is preselected to have a predetermined symmetry. Autocorrelation is affected in the standard manner and also in respect to the transmitted code shifted by one bit in time. Summation of the two autocorrelation functions provides a new autocorrelation function in which the sidelobes between main correlation peaks are suppressed | Debuisser Jean-Claude A. (Velizy, FR) | International Standard Electric Corporation (New York, NY) | 14.12.1977 | 29.05.1979 | G01S13/28, G01S13/00, G01S009/233, G01S13/288 | 05/860147 |
| 270 | 4153900 | Phase-coded pulse compression type pulsed energy system | In a binary phase-coded pulse compression type pulsed energy system, means for synchronously transmitting two separately binary coded signals, the code for each signal having an autocorrelation function exhibiting a maximum synchronously occurring with that of the other coded signal, the two autocorrelation functions, when combined, being mutually cancelling except at the synchronous occurrence of the maxima of the autocorrelation functions | Novak Leslie M. (Mission Viejo, CA), Yen Leslie (Fullerton, CA) | Rockwell International Corporation (El Segundo, CA) | 20.12.1967 | 08.05.1979 | G01S13/28, G01S13/00, G01S009/233, G01S13/288 | 04/692054 |
| 271 | 4136341 | Radar system employing two kinds of pulses | A radar system comprises a first generator for generating frequency modulated transmitter pulses of relatively long duration and a second generator for generating transmitter pulses of relatively short duration, the pulse repetition frequency of the second generator being greater than that of the first generator. The radar system further comprises a receiver having a first receiving channel, containing a pulse compression filter for the detection of return signals from the frequency-modulated transmitter pulses of relatively long duration, and a second receiving channel for the detection of return signals from the transmitter pulses of relatively short duration | Mulder Willem (Borne, NL), Bouman Antonius F. M. (Hengelo, NL), Zwarts Johan M. C. (Borne, NL) | Hollandse Signaalappareten, B.V. (Hengelo, NL) | 31.10.1977 | 23.01.1979 | G01S7/28, G01S13/28, G01S13/00, G01S13/10, G01S009/233, G01S009/42, G01S7/2813, G01S13/106, G01S13/28 | 05/846692 |
| 272 | 4114153 | Echo location systems | This invention generally relates to echo location or ranging systems in which the individual properties of targets or reflectors (such as range, bearing, elevation angle, relative velocity, impedance contrast, etc.) in a field of targets within some propagation medium are identified by the emission of signals into the propagation medium and processing of the detected reflections from the target field | Neidell Norman S. (Houston, TX), Family ID | --- | 01.06.1976 | 12.09.1978 | G01S15/58, G01S7/02, G01S7/523, G01S3/00, G01S13/87, G01S15/00, G01S3/80, G01S13/02, G01S7/527, G01S13/28, G01S13/42, G01S7/41, G01S13/00, G01S13/30, G01S15/10, G01S13/10, G01S7/292, G01S009/44, G01S3/80, G01S7/292, G01S7/41, G01S7/527, G01S13/02, G01S13/106, G01S13/28, G01S13/30, G01S13/42, G01S13/878, G01S15/108, G01S15/582 | 05/691674 |
| 273 | 4112496 | Capacitor matrix correlator for use in the correlation of periodic signals | A capacitor matrix correlator is provided for correlating two or more periodic signals in which a passive correlator is provided with a summing circuit implemented on the same printed circuit board utilized to form the capacitor correlator matrix. The capacitor correlator matrix and summing circuit are manufactured through the use of face to face printed circuit boards having overlying sections patterned and registered so as to form the capacitive elements, thereby simplifying the manufacture of the capacitive correlator and summing circuits | Stevens Robert R. (Chelmsford, MA) | Sanders Associates, Inc. (Nashua, NH) | 18.02.1977 | 05.09.1978 | G01S13/58, G01S13/62, G01S13/28, G01S13/00, G06F17/15, G06F015/34, G01S13/288, G01S13/58, G01S13/62, G06F17/15 | 05/769994 |
| 274 | 4110755 | Pulse radar device with phase- or frequency-modulation | A pulse radar device employs binary coding of the transmitted signal, hard limiting of the received signals and compression of the received signals. During compression the signals which exceed a predetermined threshold value are summed for evaluation. A tapped delay line and selectively located phase reversers at the taps read the received code against the transmitted code. The code may also be synchronously changed at the transmitter and receiver as an additional security measure | Zottl Anton (Munich, DE) | Siemens Aktiengesellschaft (Berlin & Munich, DE) | 22.09.1970 | 29.08.1978 | G01S13/28, G01S13/00, G01S009/233, G01S13/286, G01S13/288 | 05/074893 |
| 275 | 4099182 | Signal receiver | A signal receiver employing constant false alarm rate (CFAR) circuitry is disclosed. The CFAR circuitry includes a dispersive delay line for stretching received echo signals, means for limiting the stretched echo signals and an inverse dispersive delay line for finally processing the stretched and limited echo signals. With delay lines of proper characteristics, the just-outlined processing of echo signals results in reconstituted signals, the amplitude of each one of such reconstituted signals being indicative of the source of a corresponding echo signal | Ward Harold R. (Bedford, MA) | Raytheon Company (Lexington, MA) | 17.01.1977 | 04.07.1978 | G01S13/00, G01S13/28, G01S7/292, G01S009/233, G01S7/2922, G01S13/28 | 05/760196 |
| 276 | 4096478 | Intra-pulse MTI system with range ambiguity suppression | A dual-pulse coherent MTI system having a time interval between pulses as short as zero. The pulses are "chirped" in opposite sense, the latter constituting a unique coding for eliminating range ambiguity problems. Video return signals are received and applied to two parallel channels each containing pulse compression and limiting circuits. The pulse compression circuits are matched uniquely to the positive chirp slope pulse in one channel and to the negative chirp slope pulse in the other channel. The channel corresponding to the earlier of the two pulses is subjected to a fixed delay of one pulse width before the outputs of the channels are differenced to produce a net MTI signal. This is a continuation of application Ser. No. 159,751, filed July 6, 1971, now abandoned | Chavez Joe D. (Tarzana, CA) | International Telephone and Telegraph Corporation (New York, NY) | 12.10.1973 | 20.06.1978 | G01S13/524, G01S13/00, G01S13/28, G01S009/42, G01S009/233, G01S13/282, G01S13/524 | 05/408967 |
| 277 | 4095225 | Range side lobe suppression method for a phase modulated radar pulse | The present invention relates to a method for eliminating range side lobes of a phase modulated radar pulse when compressing the same in the receiver of a radar equipment. The incoming radar pulse is inverse filtered in the receiver by means of two digital filters. After filtering in the first filter the sequence thus obtained is reversed in time and the reversed sequence is again filtered in the second filter so that it is possible to use only stable filters for the inverse filtering | Erikmats Erik Osten (Vastra Frolunda, SW) | Telefonaktiebolaget L M Ericsson (Stockholm, SW) | 22.11.1976 | 13.06.1978 | G01S13/00, G01S13/28, H03H17/00, G01S007/28, G01S13/288, H03H17/00 | 05/743777 |
| 278 | 4092603 | System for obtaining pulse compression in the frequency domain | The pulse envelope of a chirped or phase coded pulse is separated from the phase modulation in such a way that the bandwidth of the signal output is decreased while the pulse width is maintained. This result is accomplished by injecting the pulse into two mixers coupled in parallel. The first mixer combines the coded pulse with a constant frequency signal generated by a local oscillator to obtain a resultant signal having an upper sideband whose phase is the sum of the phases of the coded pulse and a lower sideband whose phase is the difference between the phases of the two signals injected into the first mixer. The lower sideband of the resultant signal is filtered out with an upper sideband bandpass filter to obtain an upper sideband signal which is combined with the coded pulse in a second mixer. The second mixer output is phased through a lower sideband bandpass filter to obtain an output pulse having a phase independent of the phase of the coded pulse input, a pulse width equal to that of the coded pulse, and a pulse amplitude proportional to that of the coded pulse. Pulse compression in the frequency domain is therefore accomplished | Harrington John B. (Los Alamitos, CA) | Hughes Aircraft Company (Culver City, CA) | 16.09.1976 | 30.05.1978 | G01S13/28, G01S13/00, H04B001/10, G01S13/288 | 05/723870 |
| 279 | 4053889 | Non-linear spread spectrum transmitter/receiver for a homing system | A spread spectrum transmitter/receiver in a pulse ranging system including surface acoustic wave devices with a nonlinear transducer to reduce frequency shift errors due to doppler effects | Johnson Robert H. (Scottsdale, AZ) | Motorola, Inc. (Schaumburg, IL) | 27.07.1976 | 11.10.1977 | G01S13/28, G01S13/00, G01S009/233, G01S13/282 | 05/709052 |
| 280 | 4053884 | High prf unambiguous range radar | A pulse-compression MTI doppler radar system includes an antenna, a transter, a coded modulator, a receiver and a display. The coded modulator is connected to the transmitter and has at least two waveform generators for coding pulses having low cross-correlation. A pulse-compression filter having at least two pulse compressors for providing pulse compressed signals is connected to the receiver. Each pulse compressor is matched autocorrelatively to a different one of the waveform generators. An MTI processor has two MTI processing channels which are responsive to the pulse-compressed signals and provide an output to the display | Cantrell Ben H. (Springfield, VA), Lewis Bernard L. (Oxon Hill, MD) | The United States of America as represented by the Secretary of the Navy (Washington, DC) | 26.03.1976 | 11.10.1977 | G01S13/522, G01S13/28, G01S13/00, G01S7/292, G01S007/28, G01S009/42, G01S7/2921, G01S13/284, G01S13/522 | 05/670816 |
| 281 | 4051472 | Large area motion sensor using pseudo-random coding technique | A system primarily for industrial security: to detect intruder movement in interior areas. A Doppler detecting, bi-static system utilizing range (time-delay) areas of varying shapes. The detection containment obtained depend on antenna beam shaping to obtain varying detection coverage. Range discrimination is effected by bi-phase modulating the transmitted CW radio frequency waves according to a maximal length pseudo-random code. The autocorrelation function provides the ideal range discrimination response for the application. Omni antenna coverages are provided and a lower rf band is used than in conventional systems for this use, affording lower moving clutter susceptibility and better coverage. The general pseudo-random coding techniques are available within the state of the Radar Arts | Albanese Damian F. (Chatsworth, CA), Waer Richard R. (Northridge, CA) | International Telephone and Telegraph Corporation (New York, NY) | 02.01.1976 | 27.09.1977 | G01S13/00, G01S13/56, G01S13/28, G01S009/42, G08B013/22, G01S13/56, G01S13/003, G01S13/288 | 05/646289 |
| 282 | 4047173 | FM pulse compression radar | An FM pulse compression radar for detecting moving targets is described wherein a predetermined sequence of FM signals spaced apart in time is transmitted, each successive FM signal in the sequence having an FM rate determined by a function of the amount of time since the sequence started. A reflected sequence of FM signals may be received wherein signals indicative of a moving target may be integrated in a single range cell | Miller Coleman J. (Arnold, MD) | Westinghouse Electric Corporation (Pittsburgh, PA) | 24.06.1976 | 06.09.1977 | G01S13/28, G01S13/00, G01S017/28, G01S13/286 | 05/699271 |
| 283 | 4044356 | Process and device for correlation for use in a doppler radar installation | In a double correlation device incorporated in a radar installation for muring distance, the transmitted high-frequency signal is modulated, by frequency displacement, by a series of pseudo-random pulses. The first correlation is carried out between each pulse of the series and a delayed version of the series, the delay being chosen to correspond to the distance zone to be swept. The resulting signal undergoes a second correlation with the signal received after reflection from the target and investigated | Fournier Jacques (Chatillon sur Bagneux, FR) | Societe Nationale d'Etude et de Construction de Moteurs d'Aviation (Paris, FR) | 22.09.1975 | 23.08.1977 | G01S13/32, G01S13/28, G01S13/00, G01S009/02, G01S007/28, G01S13/284, G01S13/325 | 05/615686 |
| 284 | 4035775 | Temperature compensated acoustic surface wave device | A temperature compensated acoustic surface wave device, such as a surface wave delay line is provided in which temperature compensation is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness. A double substrate arrangement is also disclosed in which the interdigital electrode structure is deposited upon the surface of a non-piezoelectric layer which in turn is placed upon the surface of a piezoelectric substrate | Schulz Manfred B. (Sudbury, MA), Holland Melvin G. (Lexington, MA) | Raytheon Company (Lexington, MA) | 24.11.1975 | 12.07.1977 | G01S13/28, G01S13/00, G10K11/36, G10K11/00, H03H9/42, H03H9/00, H03H9/02, H03H9/145, H03H3/00, H03H3/10, G01S007/28, G01S13/28, G01S13/282, G10K11/36, H03H3/10, H03H9/02574, H03H9/02834, H03H9/145, H03H9/42 | 05/634948 |
| 285 | 4028700 | Pulse compression radar and method of operating such a radar | A method is described for improving the operation of a digital pulse compression radar by compensating for amplitude variations in the modulation signal of the transmitted pulse. In the disclosed embodiment, the contemplated compensation is effected by modifying the stored complex conjugate of the frequency spectrum of the transmitted waveform | Carey David R. (Sudbury, MA), Goldstone Bertram J. (Lexington, MA), Thompson Bernard J. (Concord, MA) | Raytheon Company (Lexington, MA) | 16.11.1972 | 07.06.1977 | G01S13/28, G01S13/00, G01S007/28, G01S13/282 | 05/307287 |
| 286 | 4028699 | Search radar | A pulsed doppler search radar is disclosed in which range, bearing, and radial velocity are made available for display. The radar incorporates a capacitor matrix correlator and an improved method of range determination utilizing passive decoding circuitry and sequential unblanking of the capacitor correlator matrix drivers where required. Moreover, a passive implementation of the doppler direction algorithm is provided in which a summing circuit is implemented on the same printed circuit board utilized to form the capacitor correlator matrix. The capacitor matrix correlator and doppler direction summing circuit are manufactured through the use of face-to-face printed circuit boards having overlying sections patterned and registered so as to form the capacitive elements thereby simplifying the manufacture of the doppler correlator and doppler direction circuits | Stevens Robert R. (Chelmsford, MA) | Sanders Associates, Inc. (Nashua, NH) | 13.12.1974 | 07.06.1977 | G01S13/58, G01S13/62, G01S13/28, G01S13/00, G06F17/15, G01S009/233, G01S009/44, G01S13/288, G01S13/58, G01S13/62, G06F17/15 | 05/532344 |
| 287 | 4020292 | Band-compressor device | A band-compressor devices designed to match to one another two systems having different pass bands, comprises means for coding input signals in the form of N digital signals corresponding, at any instant, to the amplitude of the input signal with respect to N quantizing levels. N bistable trigger stages of RS or JK type, followed by as many D-type bistable stages, are provided to receive said digital signals on the one hand and pulses furnished by a clock on the other. The output signals from furnish analog signals or in a coder for furnishing signals in binary form | Charlot Jean-Claude (Paris, FR), Falconnier Jean-Claude (Paris, FR) | Thomson-CSF (Paris, FR) | 03.12.1975 | 26.04.1977 | G01S13/28, G01S13/00, H04B001/66, G01S13/28 | 05/637469 |
| 288 | 4016563 | Method and apparatus for acousto-optic pulse compression | There is disclosed a pulse processing method and apparatus for compressing or changing the time scale of signal information represented by the modulation of a pulse of carrier energy which method and apparatus utilizes a crystal through which both a pulse of radio frequency acoustic energy and a pulse of polarized optical energy are simultaneously and colinearly transmitted to scatter energy in the optical pulse from one polarization state into the orthogonal polarization state. The crystal output is thus comprised of two optical pulses. One is the pulse having the original state of polarization and the other is the pulse resulting from the energy scattered to the orthogonal polarization state. The optical energy of rotated polarization is modulated in a fashion reproducing the modulation of the ultrasonic wave by which it is scattered. Furthermore, a short optical pulse can pass through the ultrasonic wave in a time short compared to the duration or length of the ultrasonic wave in the crystalline device. In so doing it reads the modulation of the acoustic pulse and transfers it to a time compressed pulse scale on the scattered optical output pulse. It is shown that the compression ratio is equal to the ratio of the velocity of light divided by the product of the velocity of sound in the crystal times the absolute value of birefringence of the crystal. If both the optical and acoustic pulses are passed through the crystal colinearly and in the same direction, the device takes a time function represented by the acoustic pulse, reverses it in time and compresses it by the ratio of light velocity to sound velocity thus producing a compressed inverse function. If the acoustic pulse and the light pulses are transmitted through the crystal colinearly but in opposite directions, the device takes a time function and without reversing it, compresses it in substantially the same ratio. The device may be applied, for example as a means of improving the signal-to-noise ratio, detection ratio and range resolution in radar systems or the like | Pedinoff Melvin E. (Canoga Park, CA) | Hughes Aircraft Company (Culver City, CA) | 27.05.1975 | 05.04.1977 | G01S13/28, G01S13/00, G06E3/00, G01S009/00, G06G007/19, G01S13/28, G06E3/001 | 05/581398 |
| 289 | 4003054 | Method of compensating for imbalances in a quadrature demodulator | A method for correcting errors due to imbalances between the two channels of a quadrature demodulator in a radar system is shown. The contemplated method comprises generally the steps of measuring, by performing a Fourier transform on a test signal periodically impressed on the quadrature demodulator, the amplitude and phase imbalances between such channels and then deriving correction coefficients to compensate for such imbalances during operation | Goldstone Bertram J. (Lexington, MA) | Raytheon Company (Lexington, MA) | 03.10.1974 | 11.01.1977 | G01S13/00, G01S7/40, G01S13/28, G01S007/40, G01S7/4021, G01S13/282 | 05/511553 |
| 290 | 3997913 | Electronic time compressor/expander utilizing magnetic storage | Electronic signals are compressed or expanded by writing periodic samples the signal onto one side of a thin magnetic disc at a first rate and then reading the samples off the other side of the disc at a second, and different, rate. In another embodiment of the invention, the samples are written onto a rotating magnetic ring or disc by a plurality of write/erase heads which are selectively gated to the signal source. The samples are then read off the disc by a plurality of read-heads which are selectively gated to the external load | Rittenbach Otto E. (Neptune, NJ) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 09.01.1975 | 14.12.1976 | G01S13/28, G01S13/00, G01S7/28, G01S7/292, G01V1/32, G01V1/28, G11B5/02, G11B20/00, G10L21/00, G11C27/00, H04B1/66, G11B005/02, G11B027/10, G01S7/2806, G01S7/292, G01S13/28, G01V1/32, G10L21/00, G11B5/02, G11B20/00007, G11C27/00, H04B1/662, H05K999/99 | 05/539884 |
| 291 | 3988679 | Wideband receiving system including multi-channel filter for eliminating narrowband interference | In a returned wave object detection receiving system, for receiving a wideband signal, means are provided for attenuating narrowband interference. A returned signal is split such that equal power broadband signals are applied to a plurality of channels. In each channel, the broadband signal is coupled through a narrowband filter and a linear amplifier in parallel with a detector and noise correlator. The narrowband signals are recombined in an adder having an output coupled to utilization means. Disabling means are coupled in each channel for disabling one narrowband channel in response to narrowband interference therein | Clarke James McMillen (Whitesboro, NY), Hearty Charles E. (Marcy, NY), Rougas John A. (Liverpool, NY) | General Electric Company (Utica, NY) | 24.02.1975 | 26.10.1976 | G01S13/28, G01S13/00, G01S7/292, H04B001/10, G01S7/2921, G01S13/28 | 05/552499 |
| 292 | 3979748 | Pulse radar apparatus | A long-range pulse radar apparatus emitting linear F.M. pulses and coherently detecting radar returns contains a chirp generator with a phase-control unit, a slope-control unit and a timing circuit. The timing circuit, supplied with a voltage resulting from the phase detection of the VCO output signal with reference to the COHO signal, determines the times when the VCO phase control voltage is to be gradually replaced by the slope-control circuit output. The latter output is determined by the period required to generate a given number of periodic variations of the signals obtained through the phase detection of the VCO output signal with reference to a fixed-frequency signal | Gellekink Bernard (Ootmarsum, NL) | Hollandse Signaalapparaten B.V. (Hengelo, NL) | 14.02.1975 | 07.09.1976 | G01S13/28, G01S13/00, G01S13/52, G01S009/233, G01S009/42, G01S13/282, G01S13/52 | 05/549771 |
| 293 | 3973260 | Dispersed pulse measurement for AGC and dynamic thresholding of a chirped radar receiver | Pulse measurement of chirped radar returns is made before dechirping by the se of a linear detector averaging circuits and time delay circuits such that the measurement is indicative of the RMS power of the pulse. Depending on the received chirp pulse different averaging circuits and time delay circuits are switched in so that its output is coincidental with the delayed dechirped signal. Output is encoded for a digital indication of the power and is fed through scalers to set the threshold of the video signal processor | Costantini Ralph J. (Millburn, NJ), Parsons Charles R. (Broomfield, CO), Schretter Stanley J. (Flanders, NJ) | The United States of America as represented by the Secretary of the Army (Washington, DC) | 06.09.1974 | 03.08.1976 | G01S13/28, G01S13/00, G01S7/292, G01S7/285, G01S7/34, G01S007/30, G01S009/233, G01S7/2922, G01S7/34, G01S13/282 | 05/503827 |
| 294 | 3971993 | High capacity recirculating delay loop integrator | A system for integrating recurring pulses. A pulse compression system. A delay network for recirculating the input pulses. The system output is a pulse which substantially equals the sum of input pulses | Constant James N. (Claremont, CA), Family ID | --- | 21.04.1972 | 27.07.1976 | G01S13/28, G01S13/00, G01S7/292, H03F1/32, H03B001/04, G01S7/2926, G01S13/28, H03F1/3229 | 05/246299 |
| 295 | 3969725 | Distance measuring equipment | Disclosed is improved distance measuring equipment comprising an airborne FM coded, chirp, interrogator transmitter in combination with a weighted matched receiver in a ground transponder. The airborne transmitter produces a long low power frequency modulated output pulse. Detection in the transponder receiver is accomplished by pulse compression matched filter techniques | Couvillon James Benedict (Dallas, TX), Daniels William Dorsey (Richardson, TX), Gassner Ronald Lee (Richardson, TX), Maher Robert Allen (Richardson, TX) | The United States of America as represented by the Secretary of (Washington, DC) | 12.06.1974 | 13.07.1976 | G01S13/28, G01S13/76, G01S13/00, G01S009/56, G01S13/282, G01S13/76 | 05/478651 |
| 296 | 3955197 | Impulse correlation function generator | A code generator produces one sequence of coded pulses having a predetermined code pattern. This sequence of coded pulses is transmitted to a remote point and received from the remote point to provide a replica of the sequence of coded pulses. A correlator is coupled to the generator and receiver responsive to the sequence and its replica to produce due to the predetermined code pattern an impulse output only when the sequence and its replica are time coincident and a zero output at all other time relationships between the sequence and its replica | Gutleber Frank S. (Wayne, NJ), Bailey Robert S. (Concord, MA) | International Telephone and Telegraph Corporation (Nutley, NJ) | 03.01.1966 | 04.05.1976 | G01S13/28, G01S13/32, G01S13/00, G01S009/233, G01S13/288, G01S13/325 | 05/518401 |
| 297 | 3952268 | Temperature compensated acoustic surface wave device | A temperature compensated acoustic surface wave device, such as a surface wave delay line is provided in which temperature compensation is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness. A double substrate arrangement is also disclosed in which the interdigital electrode structure is deposited upon the surface of a non-piezo-electric layer which in turn is placed upon the surface of a piezoelectric substrate | Schulz Manfred B. (Sudbury, MA), Holland Melvin G. (Lexington, MA) | Raytheon Company (Lexington, MA) | 29.07.1974 | 20.04.1976 | G01S13/28, G01S13/00, G10K11/00, G10K11/36, H03H3/10, H03H9/00, H03H3/00, H03H9/02, H03H9/42, H03H9/145, H03H007/30, G01S13/28, G01S13/282, G10K11/36, H03H3/10, H03H9/02574, H03H9/02834, H03H9/145, H03H9/42 | 05/492791 |
| 298 | 3945012 | Wide band pulsed energy system | A wideband pulsed energy system having improved signal-to-clutter response, and utilizing a chirped or frequency-modulated carrier pulse having a preselectively amplitude modulated envelope. A non-linear receiver-mixer cooperates with a successive intermediate frequency stage (the bandwidth of which correponds to the amplitude modulation bandwidth) for providing an output corresponding to the modulation envelope | Cooper George P. (Corona Del Mar, CA) | Rockwell International Corporation (El Segundo, CA) | 07.11.1966 | 16.03.1976 | G01S13/28, G01S13/00, G01S007/28, G01S009/02, G01S13/282 | 04/593237 |
| 299 | 3945011 | Radar system employing consecutive pulses only one of which is frequency swept | A radar system is described in which a transmitter transmits two consecutive pulses only one of which is frequency swept and in which a receiver has two channels, one for non-swept pulses reflected from short range targets and the other for swept pulses from long range targets | Glasgow John Arthur (Chelmsford, EN) | The Marconi Company Limited (Chelmsford, EN) | 10.10.1974 | 16.03.1976 | G01S13/28, G01S13/30, G01S13/10, G01S13/00, G01S009/233, G01S13/106, G01S13/28, G01S13/30 | 05/513812 |
| 300 | 3945010 | Pulse compression radar | The invention is concerned with a bi-phase decoder in which compensation is provided for Doppler shift. In the phase decoder of the invention, the signs and magnitudes of the components of the received signals in the in-phase and quadrature axes are determined and errors caused by Doppler shift are detected by detecting changes in the product of the signs of the two components at times when the magnitude of a predetermined one of the components exceeds that of the other | Wardrop Brian (Worcester, EN) | The Marconi Company Limited (Chelmsford, EN) | 09.08.1974 | 16.03.1976 | G01S13/28, G01S13/00, G01S009/233, G01S13/288 | 05/496271 |
| 301 | 3931420 | Temperature compensated acoustic surface wave device | A temperature compensated acoustic surface wave device, such as a surface wave delay line is provided in which temperature compensation is provided by the deposition of an interdigital electrode structure on a substrate with an overlay film surface of piezoelectric material of a predetermined thickness. A double substrate arrangement is also disclosed in which the interdigital electrode structure is deposited upon the surface of a non-piezoelectric layer which in turn is placed upon the surface of a piezoelectric substrate | Schulz Manfred B. (Sudbury, MA), Holland Melvin G. (Lexington, MA) | Raytheon Company (Lexington, MA) | 14.05.1973 | 06.01.1976 | G01S13/28, G01S13/00, G10K11/00, G10K11/36, H03H3/10, H03H9/00, H03H3/00, H03H9/02, H03H9/42, H03H9/145, B05D005/12, G01S13/28, G01S13/282, G10K11/36, H03H3/10, H03H9/02574, H03H9/02834, H03H9/145, H03H9/42 | 05/359801 |