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7598899 Method and apparatus for compression of SAR images  
A computer system for compressing synthetic aperture radar (SAR) images includes a database for storing SAR images to be compressed, and a processor for compressing a SAR image from the database....
7567198 Subaperture 3D imaging  
Embodiments of methods, apparatuses, and articles for receiving phase history data collected from synthetic aperture radar imaging of a terrain, dividing the received phase history data into a...
7538712 Method and apparatus for decompression of SAR images  
A computer system for decompressing synthetic aperture radar (SAR) images includes a database for storing SAR images to be decompressed, and a processor for decompressing a SAR image from the...
7456780 Method and system for developing and using an image reconstruction algorithm for detecting and imaging moving targets  
Image reconstruction approaches that use standard Cartesian-sampled, frequency-domain SAR data, which can be collected by a platform with a single radar antenna, together with its associated...
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)...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
6781541 Estimation and correction of phase for focusing search mode SAR images formed by range migration algorithm  
A method for acquiring synthetic aperture images of stationary targets converts a plurality of radar signals stored as digital values and motion compensated to a first order into a well focused...
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...
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...
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...
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...
6087981 Method for pulse compression with a stepped frequency waveform  
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...
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...
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...
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...
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...
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...
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...
5440309 Method of extracting motion errors of a carrier bearing a coherent imaging radar system from radar raw data and apparatus for carrying out the method  
In a method of extracting motion errors of a carrier bearing a coherent imaging radar system from radar raw data, after calculating the entire azimuth spectrum (S(f,i)) and before correlation the...
5327140 Method and apparatus for motion compensation of SAR images by means of an attitude and heading reference system  
For motion compensation of SAR images by means of an attitude and heading reference system a mean track angle (ψ T ) flight is selected as desired flight direction; an acceleration (a x ...
5307070 Method for resolving ambiguity in the determination of antenna angle of view and Doppler frequency in synthetic aperture radar  
In a method for resolving ambiguity in the determination of antenna angle of view and Doppler frequency in synthetic aperture radar (SAR), by evaluating the dependence of the Doppler frequency on...
5260708 Three dimensional interferometric synthetic aperture radar terrain mapping with unambiguous phase unwrapping employing subset bandwidth processing  
Synthetic aperture radar data is used to produce a terrain map. Two synthetic radar antennas are placed on an aircraft, which moves in a set of substantially parallel flight paths. At least one...
5257028 Method of extracting phase errors caused by the atmosphere in the backscatter signal of a coherent imaging radar system carried by a carrier from radar raw data and apparatus for carrying out the method  
In a method of extracting phase errors caused by the atmosphere in the backscatter signal of an on-board coherent imaging radar system from radar raw data, firstly to image areas with different...
5243351 Full aperture image synthesis using rotating strip aperture image measurements  
A spinning strip aperture imaging radiometer sensor system and data processing method that is capable of synthesizing full circular aperture images from a plurality of image frames acquired by the...
5237329 Method of correcting range migration in image generation in synthetic aperture radar  
In a method for correcting range migration in image generation in synthetic aperture radar (SAR) to eliminate the entire range migration or the residual range migration left by a conventional...
5200754 Fourth-order-product phase difference autofocus  
The present invention is a computational method, defined by a computational algorithm, that automatically corrects synthetic array radar (SAR) focus errors more accurately than conventional...
5184134 Fast phase difference autofocus  
A phase difference autofocus method that only requires one FFT for estimating a phase error in the entire synthetic array radar data. The phase difference autofocus method of the present invention...
5179383 Synthetic aperture radar processor to handle large squint with high phase and geometric accuracy  
A digital signal processor for synthetic aperture radar (SAR) data comprising a method of implementing range cell migration correction without the use of an interpolator, and a method of applying...
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...
5170170 Radiation imaging utilizing data reconstruction to provide transforms which accurately reflect wave propagation characteristics  
A system for radiation imaging of an object in response to echo signals from a target area of the object, such as a region of the anatomy of a body. Data is obtained by time domain measurements at...
5166688 Method for extracting motion errors of a platform carrying a coherent imaging radar system from the raw radar data and device for executing the method  
For the imaging of terrains with varied ground reflectivity, azimuth spectra continuously following each other in time are formed over a set period of time in a method for extracting motion errors...
5160931 Interferometric synthetic aperture detection of sparse non-surface objects  
A technique for detecting non-surface objects from a moving platform using radiant ranging. The platform moves perpendicular to a line through a pair of first and second transducers. A transmitter...
5132693 Radar apparatus  
An imaging radar system for an aircraft includes four transmit antennas, connected to a central transmitter, and four receive antenna arrays for respectively receiving reflections of signals...
5043734 Discrete autofocus for ultra-high resolution synthetic aperture radar  
The invention provides improved focus by phase corrections for Synthetic Aperture Radar images by operation on the range bin containing a selected isolated target. A phase correction signal is...
Matches 1 - 50 out of 74 1 2 >