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7619554 |
Passive radar utilizing space-borne digital electromagnetic illuminators
In a passive radar system a space-borne transmitter broadcasts wide-band digitally modulated signals over a region and illuminates the region. A receiver antenna is oriented to receive radiation...
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7598900 |
Multi-spot inverse synthetic aperture radar imaging
Providing multi-spot inverse synthetic aperture radar (ISAR) imagery is disclosed. Embodiments of techniques in accordance with the present disclosure may advantageously improve multiple target...
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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....
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7570202 |
Polarimetric selectivity method for suppressing cross-track clutter in sounding radars
Methods for suppressing cross-track clutter in a sounding radar utilize polarimetric selectivity in two ways: (1) transmitting full-beam circular polarization and separating the desired signal of...
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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...
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7551119 |
Flight path-driven mitigation of wavefront curvature effects in SAR images
A wavefront curvature effect associated with a complex image produced by a synthetic aperture radar (SAR) can be mitigated based on which of a plurality of possible flight paths is taken by the SAR...
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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...
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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;...
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7532150 |
Restoration of signal to noise and spatial aperture in squint angles range migration algorithm for SAR
A moving radar generates a search mode synthetic aperture image of a patch having a principal scatterer. The boundaries of the patch are from R 0 to R 1 slant range and θ 0 to θ 1 azimuth...
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7511656 |
Spotlight synthetic aperture radar (SAR) system and method for generating a SAR map in real-time using a modified polar format algorithm (PFA) approach
Embodiments of spotlight synthetic aperture radar (SAR) systems and methods generating a SAR map in real time with minimum latency using a modified Polar Format Algorithm are generally described...
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7511655 |
Method and apparatus for 3-D sub-voxel position imaging with synthetic aperture radar
A method and apparatus for determining three dimensional sub-voxel positions using synthetic aperture radar. The apparatus includes at least four non-coplanar, phase-coherent synthetic aperture...
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7508334 |
Method and apparatus for processing SAR images based on an anisotropic diffusion filtering algorithm
A computer system for processing synthetic aperture radar (SAR) images includes a database for storing SAR images to be processed, and a processor for processing a SAR image from the database. The...
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7498968 |
Synthetic aperture design for increased SAR image rate
High resolution SAR images of a target scene at near video rates can be produced by using overlapped, but nevertheless, full-size synthetic apertures. The SAR images, which respectively correspond...
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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...
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7450054 |
Method and apparatus for processing complex interferometric SAR data
A computer system for processing interferometric synthetic aperture radar (SAR) images includes a database for storing SAR images to be processed, and a processor for processing interferometric SAR...
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7439906 |
Doppler-compensated radar pulse compression processing system and method
A radar receiver system includes a receiver, a processor including a Doppler Compensated Adaptive Pulse Compressor (DCAPC) algorithm, possible other intermediate processing and a target detector....
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7436349 |
Controlling data collection to support SAR image rotation
A desired rotation of a synthetic aperture radar (SAR) image can be facilitated by adjusting a SAR data collection operation based on the desired rotation. The SAR data collected by the adjusted...
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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)...
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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....
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7391357 |
Correction of 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...
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7372393 |
Method and system for determining unwrapped phases from noisy two-dimensional wrapped-phase images
A method converts an input image of noisy wrapped phases to an output image of absolute unwrapped phases. The noisy wrapped phases in the input image are represented as a set of re-wrapped phases...
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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...
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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...
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7324042 |
Monostatic radar beam optimization
A method and system for optimizing transmit beam and receive beam antenna radiation patterns. The method includes inputting initial estimate of beam weights for a transmit beam and a receive beam...
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7301495 |
Interrupt SAR implementation for range migration (RMA) processing
A moving radar ( 405 ) generates a synthetic aperture image from an incomplete sequence of periodic pulse returns. The incomplete sequence of periodic pulse returns has one or more missing pulses....
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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...
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7259716 |
Quadrature mixture LO suppression via DSW DAC noise dither
A Quadrature Error Corrected Digital Waveform Synthesizer (QECDWS) employs frequency dependent phase error corrections to, in effect, pre-distort the phase characteristic of the chirp to compensate...
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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...
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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...
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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...
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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...
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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...
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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...
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7167726 |
Multi-mode antenna system for a computing device and method of operation
An antenna system for a computing device operable in multiple communication modes.
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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...
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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...
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7145497 |
Robust detection technique of fixed and moving ground targets using a common waveform
Detection of moving targets in SAR images is improved by a radar on a moving platform for generating a focused synthetic aperture image of a scene The scene contains a target described by pixels...
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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...
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7142149 |
Mensuration for the conformal range migration algorithm
A radar system is mounted on a moving platform moving along a great circle. The radar comprises a radar receiver for digitizing radar returns having a phase from a scatterer (target) in a scene. A...
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7126524 |
Motion compensation for convolutional SAR algorithms
A synthetic aperture image of a scene is acquired using a radar system. The scene has one or more radar scatterers located on a horizontal flat {circumflex over (x)},ŷ plane. The radar system is...
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7119732 |
Bistatic and multistatic system for space situational awareness
Provided is a bistatic and multistatic system for detecting and identifying a target in close proximity to an orbiting satellite. An electromagnetic fence is established to surround the satellite,...
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7116265 |
Recognition algorithm for the unknown target rejection based on shape statistics obtained from orthogonal distance function
A method for classification of a target object having a periphery comprises the steps of: selecting a plurality of random first chords D 1 across the periphery of the target object;
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7109911 |
Dual synthetic aperture radar system
The dual synthetic aperture array system processes returns from the receiving arrays. The two identical receiving arrays employing displaced phase center antenna techniques subtract the...
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7106250 |
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;...
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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...
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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...
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7095359 |
Method of observing sea ice
An ice thickness/drifting velocity observation of sea ice by using an ice thickness measurement sonar and a current meter moored into the sea and a sea ice observation by a high-resolution airborne...
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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...
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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...
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7015855 |
Creating and identifying synthetic aperture radar images having tilt angle diversity
An apparatus for and method of employing synthetic aperture radar (SAR) images to automatically classify a target comprising emitting and collecting SAR signals at a plurality of squint angles,...
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