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| Number | Title | Issue Date |
| 8179301 | Image processor and image processing method for synthetic aperture radar An image processor and an image processing method for a synthetic aperture radar searching for a target are provided. A high resolution processing unit performs high resolution processing up to an area equivalent to a small target or smaller to thereby acquire infor... | 05/15/2012 |
| 7411540 | Synthetic aperture radar (SAR) data compression A method of compressing phase history (PH) data includes (a) dividing PH data into multiple sub-apertures; (b) transforming the sub-apertures into multiple coarse resolution images; and (c) compressing each of the coarse resolution images. Compressing each of the co... | 08/12/2008 |
| 7397418 | SAR image formation with azimuth interpolation after azimuth transform Two-dimensional SAR data can be processed into a rectangular grid format by subjecting the SAR data to a Fourier transform operation, and thereafter to a corresponding interpolation operation. Because the interpolation operation follows the Fourier transform operati... | 07/08/2008 |
| 7348917 | Synthetic multi-aperture radar technology Systems and methods of improving synthetic aperture radar (SAR) system are disclosed. In particular, an example system includes a radar signal radiator configured to transmit radar signal pulses that have a partial bandwidth at a regular interval. The partial bandwi... | 03/25/2008 |
| 7333046 | System and method for monitoring targets A system comprising a moving radar, a processing device, and a phase difference determination device is used to monitor a target. The moving radar has first and second phase centers that transmit and receive signals normal to a direction of movement of the radar. Th... | 02/19/2008 |
| 7317417 | Methods for detection and tracking of targets The present invention relates to active sensor applications, and more particularly is directed to efficient systems and methods for detection and tracking of one or more targets. The invention provides a method for receiving signals reflected from one or more target... | 01/08/2008 |
| 7315276 | Beam compression radar A concept is described for broadening the beam of a phased array radar antenna to provide continuous illumination of all radar targets within the search space, and this beam is compressed upon reception to realize the angular resolution that is possible with the ant... | 01/01/2008 |
| 7307580 | Non-statistical method for compressing and decompressing complex SAR data Provided is a non-statistical method for compressing and decompressing complex SAR data derived from reflected energy. The method includes selecting a first FFT to provide a target ratio of pixel spacing to resolution. A second FFT is then selected which is smaller ... | 12/11/2007 |
| 7277042 | Compensation of flight path deviation for spotlight SAR A radar acquires a formed SAR image of radar scatterers in an area around a central reference point (CRP). Target(s) are within the area illuminated by the radar. The area covers terrain having a plurality of elevations. The radar is on a moving platform, where the ... | 10/02/2007 |
| 7245250 | Synthetic aperture radar image compression A method is disclosed of generating multi-resolution images using synthetic aperture radar (SAR) phase history data. A high resolution SAR image may be formed from the phase history data, or a lower resolution SAR image may be formed from a sub-aperture of the phase... | 07/17/2007 |
| 7242342 | Super-resolution based on frequency domain interferometric processing of sparse multi-sensor measurements A system for obtaining frequency domain interferometric super-resolution of a target scatterer, having a first and a second coherent transceivers, a mutual coherent sub-system and an estimation system. The first and second coherent transceivers are operative to prod... | 07/10/2007 |
| 7239263 | Platform shake compensation method in synthetic aperture processing system The present information comprises the stages of: applying frequency analysis to positional information on a platform, generating virtual positional information on the platform based on a frequency analysis result; extracting a signal based on the generated virtual p... | 07/03/2007 |
| 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 |
| 7212149 | System, method and computer program product for detecting and tracking a moving ground target having a single phase center antenna A synthetic aperture radar (SAR) system having a single phase center antenna is provided, the SAR system including a measurement unit and a tracker unit. The measurement unit is capable of receiving a phase history of a target point scatterer. From the phase history... | 05/01/2007 |
| 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 |
| 7197095 | Inverse fast fourier transform (IFFT) with overlap and add A system for efficiently filtering interfering signals in a front end of a GPS receiver is disclosed. Such interfering signals can emanate from friendly, as well as unfriendly, sources. One embodiment includes a GPS receiver with a space-time adaptive processing (ST... | 03/27/2007 |
| 7196653 | Imaging apparatus and method An imaging apparatus has transmitter illuminating a selected surface with a radar beam footprint, and processor for profiling/processing the radar returns so as to derive attitude information in real time about a number of predefined axes associated with the radar w... | 03/27/2007 |
| 7183965 | Efficient stripmap SAR processing for the implementation of autofocus and missing pulse restoration A moving radar generates a search mode synthetic aperture image of a patch from a sequence of periodic pulse returns having one or more missing pulses. An azimuth and range interpolation generates an interpolated sequence having samples oriented in range and azimuth... | 02/27/2007 |
| 7151476 | Radar system having a beamless emission signature A radar system having a beamless emission signature is described. In one implementation, the radar system includes a transmission system and a receiver system. The transmission system is configured to transmit a pattern comprising a plurality of radar signals having... | 12/19/2006 |
| 7145496 | Autofocus method based on successive parameter adjustments for contrast optimization A radar on a moving platform generates an initial synthetic aperture (SAR) image of a scene from a sequence of periodic pulse returns approximately motion compensated. The SAR image is formed from pixel intensities zn(x,y) within a x,y extent of the initi... | 12/05/2006 |
| 7145498 | Efficient autofocus method for swath SAR A moving radar generates a search mode synthetic aperture image of a patch from periodic pulse returns reflected from the patch. The patch is imaged from radar returns derived from two or more overlapping arrays. A strong scatterer is located within each array, then... | 12/05/2006 |
| 7136010 | Measurement and signature intelligence analysis and reduction technique Methods and apparatus compress data, comprising an In-phase (I) component and a Quadrature (Q) component. Statistical characteristics of the data are utilized to convert the data into a form that requires fewer bits in accordance with the statistical characteristics... | 11/14/2006 |
| 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 |
| 7006031 | Interrupt SAR image restoration using linear prediction and Range Migration Algorithm (RMA) processing SAR images are improved by a method for acquiring a synthetic aperture image from a sequence of periodic pulse returns where the sequence of periodic pulse returns is interspersed with interrupts, i.e. missing pulses. The interrupts mark the start and end of one or ... | 02/28/2006 |
| 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 ... | 11/22/2005 |
| 6875978 | Modelocked waveform for synthetic aperture ladar A synthetic aperture ladar system using a mode locked laser transmitter. The inventive system (12) includes a mode locked laser transmitter (22), a receiver (40) adapted to detect signals transmitted by said laser (22) and reflected by an... | 04/05/2005 |
| 6873285 | Method and system for providing along-track alignment and formatting of synthetic aperture radar (SAR) data, and SAR image formation algorithms using such method and system An along-track alignment and formatting system (ATAFS) formats synthetic aperture radar (SAR) data to align and format signals from scatterers in a scene to achieve an ideal data format in the along-track dimension in which such ideal data format leads to improved i... | 03/29/2005 |
| 6864827 | Digital intermediate frequency receiver module for use in airborne SAR applications A digital IF receiver (DRX) module directly compatible with advanced radar systems such as synthetic aperture radar (SAR) systems. The DRX can combine a 1 G-Sample/sec 8-bit ADC with high-speed digital signal processor, such as high gate-count FPGA technology or ASI... | 03/08/2005 |
| 6356227 | Smearing compensation apparatus for a radar system A smearing compensation apparatus for a radar system having a scanning antenna is provided. The apparatus includes a first memory for storing a plurality of data streams, with each data stream corresponds to a radar signal received at a different angular ... | 03/12/2002 |
| 6333986 | Cepstral method and system for detecting/classifying objects from air-based or space-based images A system and method for detecting and/or classifying an obscured discrete cultural object and/or an obscured replicated object using image data from an optical, infrared or synthetic aperture radar imaging system is disclosed. Generally, the method and sy... | 12/25/2001 |
| 6166677 | Image synthesizing method using a plurality of reflection radar waves and aircraft image radar apparatus using the method The present invention provides a small-size image radar apparatus to be mounted on an aircraft, having a high resolution not only the flying direction but also in the direction vertical to the flying direction. The image radar apparatus comprises a transm... | 12/26/2000 |
| 6163293 | Radio wave receiving apparatus having an improved antenna resolution A radio wave receiving apparatus including having improved antenna resolution. The apparatus includes a signal processing circuit; a circuit for performing the Fourier transform with respect to an azimuth of an electric field signal outputted from an ante... | 12/19/2000 |
| 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... | 07/11/2000 |
| 6020843 | Technique for implementing very large pulse compression biphase codes A processing method for use in providing improved SAR imagery at high duty factors that provides for enhanced radar sensitivity. Radar signals are transmitted that embody a high duty factor ultra-high resolution SAR waveform generated using a biphase code... | 02/01/2000 |
| 5945937 | Along-track interferometric synthetic aperture radar An along-track interferometric SAR (Synthetic Aperture Radar) of the present invention includes a single SAR line and observes a target only once. SAR data derived from a single observation are subjected to look division in order to reproduce two SAR imag... | 08/31/1999 |
| 5943006 | RF image reconstruction and super resolution using fourier transform techniques Special mathematical techniques are used to process accurate energy measurements in the focal plane of a high quality imaging system to produce high resolution images. The improved resolution exceeds the generally accepted Rayleigh limits. That is accompl... | 08/24/1999 |
| 5861835 | Method to improve data obtained by a radar A method of improving data obtained by radar by interpolation over frequency bands jammed by narrow-band interference, at which the following steps (A)-(J) are carried out. (A) It is determined what frequency values are affected by narrow-band interferenc... | 01/19/1999 |
| 5796363 | Automatic position calculating imaging radar with low-cost synthetic aperture sensor for imaging layered media An imaging system for analyzing structures comprises a radar transmitter and receiver connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for each radar pulse transmission. The radar transmitter and rece... | 08/18/1998 |
| 5736957 | Delay compensated doppler radar altimeter A delay compensated Doppler radar altimeter which eliminates the relative delay curvature associated with the energy reflected by a scatterer located in the along-track direction of an aerial platform for which a most accurate estimation of scatterer elev... | 04/07/1998 |
| 5488373 | Signal processing apparatus for synthetic aperture radar A signal processing apparatus for use in SAR radar. The signal processing apparatus uses a new method of processing SAR images, primarily for wide band SAR. The new method is based on the numerical unfolding of differential equations along the flight path... | 01/30/1996 |
