Class 342/25E - With time domain processing of the SAR signals in azimuth, e.g. time focusing (EPO)

Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
No. of patents: 27
Last issue date: 08/17/2010

Number	Title	Issue Date
7777665	Comparing range data across the slow-time dimension to correct motion measurement errors beyond the range resolution of a synthetic aperture radar Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the sl...	08/17/2010
7362697	Self-healing chip-to-chip interface A method, apparatus, and computer instructions for managing a set of signal paths for a chip. A defective signal path within the set of signal paths for the chip is detected. Signals are re-routed through the set of signal paths such that the defective signal path i...	04/22/2008
7327305	Process for the evaluation of signals in an SAR/MTI pulsed radar system The invention relates to a process for the evaluating a received signal of an SAR/MTI pulsed radar system that transmits SAR and MTI pulses with respective definable pulse repetition frequency PRF_SAR and PRF_MTI, such that the received signal is a superimposition c...	02/05/2008
7236125	Method for reducing angular blur in radar pictures A method for reducing angular blur in radar pictures achieved in range bin based detection systems includes measuring a variable S(x, y) such as amplitude or power as a function of an angle x and a distance y. An expression: corrected angular position=angu...	06/26/2007
7218268	Self-calibrating interferometric synthetic aperture radar altimeter A synthetic aperture radar system uses RF bandwidth and Doppler beam sharpening principles to develop fine altitude and along-track resolutions. To achieve accurate cross-track position measurements the system and method exploit a combination of modes based on a nov...	05/15/2007
7215277	Sub-aperture sidelobe and alias mitigation techniques Methods for mitigating sidelobes and aliases, providing levels of suppression in excess of 20 dB. The methods may include 1) a version of the CLEAN algorithm developed in radio astronomy, modified to work on sub-aperture images; 2) weighting functions based on the p...	05/08/2007
7205927	Technique for low grazing angle 3D SAR target recognition A radar on a moving platform for three dimensional target recognition of a target on a flat or sloping terrain is described. The target is illuminated from a plurality of locations to generate images at many aspect angles. The radar is positioned at a low grazing an...	04/17/2007
7170440	Linear FM radar A FM-CW radar system comprises a frequency modulated continuous wave digital generator that produces both in-phase (I) and quadrature-phase (Q) outputs to orthogonally oriented transmitter antennas. A linearly polarized beam is output from a switched antenna array t...	01/30/2007
7106242	High range resolution radar system Described herein is a method and apparatus for improving high range resolution of a radar system. The method comprises phase shifting a radar pulse to be transmitted at substantially the radar transmission frequency and phase shifting the received radar pulse at sub...	09/12/2006
7106243	Technique for enhanced quality high resolution 2D imaging of ground moving targets A radar receiver on a moving platform images a moving target and non-moving clutter using a single SAR array. The radar receiver converts the radar returns into digital radar returns and motion compensates the digital radar returns with respect to a reference, then ...	09/12/2006
7071867	Method, apparatus, and computer program product for radar detection of moving target Methods, apparatus, and computer program products are provided for tracking at least one moving target with a radar device without requiring the use of Doppler information. The invention comprises scanning an area with radar signals at a first time to receive a firs...	07/04/2006
7064702	System, method and computer program product for reducing quadratic phase errors in synthetic aperture radar signals A method is provided for reducing quadratic phase errors in synthetic aperture radar signals from a plurality of range lines where each range line includes a plurality of azimuth positions. The method includes receiving a plurality of slow-time samples representing ...	06/20/2006
7042386	Sub-aperture sidelobe and alias mitigation techniques Methods for mitigating sidelobes and aliases, providing levels of suppression in excess of 20 dB. The methods may include 1) a version of the CLEAN algorithm developed in radio astronomy, modified to work on sub-aperture images; 2) weighting functions based on the p...	05/09/2006
7038612	Method for SAR processing without INS data A Synthetic Aperture Radar (SAR) avoids the need for an INS/GPS by focusing a SAR image having discernible features and a center. The image is formed from digitized returns, each of the digitized returns having a phase and an amplitude. The focusing steps of an algo...	05/02/2006
7030808	Nonlinear target recognition Nonlinear target detection for the detection of extremely weak signals when buried in very high levels of noise is performed with improvement of the quality of the signals received in the data by the amplification of the signal to noise (S/N) ratio. The S/N ratio in...	04/18/2006
7006034	Fast and slow time scale clutter cancellation Target detection in the presence of non stationary clutter is improved by a radar receiver on a moving platform for detecting a target using a plurality of short coherent arrays and a plurality of long coherent arrays synthesized from the short coherent arrays overl...	02/28/2006
6904160	Method for matching geographic information with recorded images A method for matching a recorded image with geographic data substantially corresponding to a geographic location where the image was recorded, is disclosed. In a preferred embodiment, global positioning system data logs are time matched with other data collected, in...	06/07/2005
5590044	Method and apparatus for finding aircraft position by integrating accelerations less time averages A method and apparatus for short-range position determination of aircraft, used for preventing errors in radar mapping from position inaccuracies, finds velocity in the x-direction (flight direction) by integrating accelerometer outputs. The accelerometer...	12/31/1996
5160932	Over-the-horizon synthetic aperture radar An over-the-horizon, synthetic aperture radar (OTHSAR) system (10) is disclosed. The OTHSAR system is used to locate moving objects (14) at long distances in response to modulated high-frequency radiation reflected by the objects and distinguishes the obj...	11/03/1992
5021789	Real-time high resolution autofocus system in digital radar signal processors This autofocus is a system for improving the image quality of an airborne Synthetic Aperture Radar (SAR), that is mechanized in the high-speed digital signal processors with some control capability from the operating console to perform on-line focusing, t...	06/04/1991
4924229	Phase correction system for automatic focusing of synthetic aperture radar A phase gradient autofocus system for use in synthetic aperture imaging accurately compensates for arbitrary phase errors in each imaged frame by locating highlighted areas and determining the phase disturbance or image spread associated with each of thes...	05/08/1990
4879559	Azimuth processor for SAR system having plurality of interconnected processing modules Synthetic aperture radar is a known system for producing a high resolution image of the terrain under a moving platform, in which the effect of a large antenna (which would give high resolution in the direction of travel (azimuth direction)) is synthesize...	11/07/1989
4339752	Synthetic array processor A synthetic array processor wherein radar data, received from an area to be mapped during a plurality of subarray flight path segments, is electronically focused in parallel processing channels to form a series of approximately rectangularly shaped low az...	07/13/1982
4227194	Synthetic array processor The method and apparatus for processing bipolar coherent sidelooking radar data to achieve continuous real time synthetic array mapping in the form of focused line-by-line imagery. Received radar data is correlated such that a number of subarrays are vect...	10/07/1980
4219811	Synthetic array autofocus system A system for automatically focusing a synthetic array through derivation of focus error signals which may be used such as by summing a priori data so that the synthetic array data may be optimally focused. Focus error data is derived by forming the synthe...	08/26/1980
4045795	Charge-coupled device data processor for an airborne imaging radar system Processing of raw analog echo data from a side-looking synthetic aperture radar receiver into images on board an airborne radar platform is made feasible by utilizing charge-coupled device (CCD) semiconductor technology. CCD circuits are utilized to perfo...	08/30/1977
3976998	Synthetic aperture radars There is disclosed a synthetic aperture radar arranged to survey a region from a mobile location. The radar returns received from the region are first phase weighted by a series of predetermined factors. They are then stored and combined with later return...	08/24/1976

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Class 342/25E - With time domain processing of the SAR signals in azimuth, e.g. time focusing (EPO)