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| Number | Title | Issue Date |
| 8159384 | Method for examining an ice region or dry region using radar echo sounding To suppress cross-ambiguities in the examination of an ice region or dry region by means of aircraft- or aerospace-supported radar echo sounding, the region to be examined is overflown by a radar sensor (6) by multiple compatible radar sensors of the same ope... | 04/17/2012 |
| 8138961 | Step frequency ISAR A step frequency inverse synthetic aperture radar (ISAR) includes a transmitter configured to transmit a transmission pulse at a transmission frequency to a near earth object (NEO), the transmission frequency having a frequency range comprising a starting frequency,... | 03/20/2012 |
| 8125370 | Polarimetric synthetic aperture radar signature detector A method is provided for processing an acquired polarimetric synthetic aperture radar (SAR) image of a region to identify a candidate pixel that correlates to a target representation. The polarimetric SAR image is composed of a plurality of pixels, and the candidate... | 02/28/2012 |
| 8120522 | System and method for inspecting a wind turbine blade A wind turbine blade inspection system includes a frequency modulated continuous wave radar system configured to be movable with respect to a wind turbine blade while transmitting reference microwave signals and receiving reflected microwave signals and a processor ... | 02/21/2012 |
| 8049657 | Method for processing TOPS (terrain observation by progressive scan)-SAR (synthetic aperture radar)-raw data Sub-aperture processing is carried out. Within each sub-aperture, range compression and a correction for the target range variation are carried out. Baseband azimuth scaling is used for processing the azimuth signal, wherein a long azimuth reference function and thu... | 11/01/2011 |
| 8009079 | Methods for two-dimensional autofocus in high resolution radar systems Provided are two-dimensional autofocus methods in a synthetic aperture radar (SAR) system which include: (1) two-dimensional pulse pair product algorithm including shear PGA, eigenvector phase history (“EPH”), shear PGA/EPH); (2) two-dimensional optimization alg... | 08/30/2011 |
| 7944390 | High-resolution synthetic aperture side view radar system used by means of digital beamforming The transmission antenna (10) of the high-resolution synthetic aperture side view radar system comprises a plurality of sub-apertures (7, 8, 9). In each individual transmission pulse, said sub-apertures are controlled in such a manner that a spatiotemp... | 05/17/2011 |
| 7928893 | Apparatus and method for compressive sensing radar imaging Method and apparatus for developing radar scene and target profiles based on Compressive Sensing concept. An outgoing radar waveform is transmitted in the direction of a radar target and the radar reflectivity profile is recovered from the received radar wave sequen... | 04/19/2011 |
| 7876257 | Method and apparatus for compressing SAR signals A method compresses synthetic aperture radar (SAR) data by sampling the SAR data into blocks and transforming each block to a corresponding block of transform coefficients. Each block of transform coefficient is quantized according to a quantization parameter to obt... | 01/25/2011 |
| 7843377 | Methods for two-dimensional autofocus in high resolution radar systems Provided are two-dimensional autofocus methods in a synthetic aperture radar (SAR) system which include: (1) two-dimensional pulse pair product algorithm including shear PGA, eigenvector phase history (“EPH”), shear PGA/EPH); (2) two-dimensional optimization alg... | 11/30/2010 |
| 7760128 | Decreasing range resolution of a SAR image to permit correction of motion measurement errors beyond the SAR range resolution 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... | 07/20/2010 |
| 7746267 | Synthetic aperture radar hybrid-polarity method and architecture for obtaining the stokes parameters of a backscattered field A synthetic aperture radar hybrid-polarity method and architecture comprising transmitting circular polarization (by driving the orthogonal linear feeds simultaneously by two identical waveforms, 90° out of phase), and receiving horizontal (H) and vertical (V) line... | 06/29/2010 |
| 7737877 | Method and apparatus for processing SAR images based on a complex anisotropic diffusion filtering algorithm A computer system for processing complex synthetic aperture radar (SAR) images includes a database for storing complex SAR images to be processed, and a processor for processing a complex SAR image from the database. The processing includes receiving a complex SAR d... | 06/15/2010 |
| 7705766 | Synthetic aperture radar A method of operating synthetic aperture radar in a low PRF mode, comprising generating a stream of radar pulses, imposing onto said stream a predetermined modulation of the Pulse Repetition Frequency (PRF), directing said stream to a target area, and processing rec... | 04/27/2010 |
| 7701380 | Beam phase modulation for improved synthetic aperture detection and estimation Phase modulated beam patterns are substituted for the constant-phase versions that have been used in prior synthetic aperture systems. Relative movement between a radar/sonar/ultrasound platform and a point target causes a sequence of echoes from the point target to... | 04/20/2010 |
| 7663529 | Methods for two-dimensional autofocus in high resolution radar systems Provided are two-dimensional autofocus methods in a synthetic aperture radar (SAR) system which include: (1) two-dimensional pulse pair product algorithm including shear PGA, eigenvector phase history (“EPH”), shear PGA/EPH); (2) two-dimensional optimization alg... | 02/16/2010 |
| 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 discrimination, detection, identification, and tracking using ISAR imagi... | 10/06/2009 |
| 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 R0 to R1 slant range and θ0 to θ1 azimuth angle. A computer motion compensates... | 05/12/2009 |
| 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 processing includes determining noise in a SAR image to be processed,... | 03/24/2009 |
| 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 images from the database. The processing includes receiving first an... | 11/11/2008 |
| 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. The DCAPC algorithm processes samples of a radar return signal, applie... | 10/21/2008 |
| 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 SAR data collection operation can be efficiently exploited to form ther... | 10/14/2008 |
| 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 |
| 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 measurement of the error. Range profiles can be compared across the sl... | 06/24/2008 |
| 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 and a set of phase shifts. The set of re-wrapped phases are partitione... | 05/13/2008 |
| 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 |
| 7336217 | Method and apparatus for interferometric radar measurement In a method for interferometric radar measurement, at least two side looking RADAR systems on satellite and/or missile-supported platforms illuminate a common surface area by means of microwave signals. A first side looking RADAR system sends a first radar signal on... | 02/26/2008 |
| 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 |
| 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 to an optimizer; and using a cost function to optimize beam weights so... | 01/29/2008 |
| 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 |
| 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. The radar converts the incomplete sequence of pulse returns into... | 11/27/2007 |
| 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 |
| 7272472 | System and method for improving aircraft formation flying accuracy and integrity An aircraft formation positioning system lead aircraft transmits a continuous RF signal and a periodic data burst with lead aircraft position. A follower aircraft receives the continuous RF signal and the periodic data burst. A follower aircraft resolver determines ... | 09/18/2007 |
| 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 for the frequency dependent phase nonlinearity of the RF and microwa... | 08/21/2007 |
| 7253766 | Three-dimensional surface/contour processing based on electromagnetic radiation interrogation One embodiment of the present invention includes scanning a target with electromagnetic radiation including one or more frequencies in a range of about 200 MHz to about 1 THz; establishing a point cloud representation of the surface of the target from the scan; and ... | 08/07/2007 |
| 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 |
| 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 |
| 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 |
