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7522096 |
Method for phase calibrating antennas in a radar system
A method for phase calibrating antennas in a radar system is disclosed. The method comprises providing a transmit antenna and two or more receive antennas, the receive antennas each in...
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7511665 |
Method and apparatus for a frequency diverse array
Method and apparatus for a frequency diverse array. Radio frequency signals are generated by a plurality of independent waveform generators and simultaneously applied to a transmit/receive module....
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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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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...
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7319427 |
Frequency diverse array with independent modulation of frequency, amplitude, and phase
Method and apparatus for a frequency diverse array. Radio frequency signals are generated and applied to a power divider network. A progressive frequency shift is applied to all radio frequency...
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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...
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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...
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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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7002508 |
Method for interferometric radar measurement
It is proposed in connection with a method for the interferometric radar measurement in conjunction with a helicopter operating in accordance with the ROSAR principle (Heli-Radar) that two coherent...
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6911932 |
Two antenna, two pass interferometric synthetic aperture radar
A multi-antenna, multi-pass IFSAR mode utilizing data driven alignment of multiple independent passes can combine the scaling accuracy of a two-antenna, one-pass IFSAR mode with the height-noise...
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6911931 |
Using dynamic interferometric synthetic aperature radar (InSAR) to image fast-moving surface waves
A new differential technique and system for imaging dynamic (fast moving) surface waves using Dynamic Interferometric Synthetic Aperture Radar (InSAR) is introduced. This differential technique and...
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6870500 |
Side looking SAR system
A synthetic aperture radar (SAR) processes radar has a transmit aperture and a receive aperture that is of a different size from the transmit aperture. The receive aperture is separated from the...
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6864828 |
Method and apparatus for collection and processing of interferometric synthetic aperture radar data
A system and method provide for the collection of interferometric synthetic aperture radar (IFSAR) data. In the system, a first space vehicle configured for emitting electro-magnetic energy and...
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6853330 |
Inverse precision velocity update for monopulse calibration
A radar system derives a correction for an actual boresight ( 311 ) of a radar monopulse antenna mounted on a moving platform from Σ data and Δ data generated with respect to an a priori known,...
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6741202 |
Techniques for 3-dimensional synthetic aperture radar
The height of a radar target above a horizontal plane at a location within the horizontal plane is measured using a synthetic aperture radar (SAR). The synthetic aperture radar is mounted on a...
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6452532 |
Apparatus and method for microwave interferometry radiating incrementally accumulating holography
A satellite architecture and method for microwave interferometry radiating incrementally accumulating holography, used to create a high-gain, narrow-bandwidth actively-illuminated interferometric...
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6150972 |
Process for combining multiple passes of interferometric SAR data
Interferometric synthetic aperture radar (IFSAR) is a promising technology for a wide variety of military and civilian elevation modeling requirements. IFSAR extends traditional two dimensional SAR...
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6150973 |
Automatic correction of phase unwrapping errors
In a phase unwrapping and correction system, phase wrapped data is unwrapped with an unwrapping algorithm to obtain unwrapped image data. The unwrapped image data is further processed to correct...
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6114984 |
Interferometric doppler guidance system
A means for identifying a particular range and Doppler shift signal in the field of view of a moving radar antenna which determines azimuth angle to this range-Doppler signal relative to the...
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6097328 |
Averaging-area-constrained adaptive interferometric filter that optimizes combined coherent and noncoherent averaging
A family of multiple scale adaptive filters and filtering methods that automatically adapt their impulse response width to local data characteristics, optimizing the accuracy, yield, and/or detail...
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6025800 |
Interferomeric synthetic aperture radar altimeter
Aircraft position determination system includes a transmitter to transmit a signal, and two receivers to receive the transmitted signal reflected from the terrain below the aircraft, and a phase...
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6011505 |
Terrain elevation measurement by interferometric synthetic aperture radar (IFSAR)
An interferometric synthetic aperture radar (IFSAR) elevation measurement processor computes an elevation array by processing a first image array to generate an elevation corrected first image...
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6011625 |
Method for phase unwrapping in imaging systems
An improved method is provided for phase unwrapping in coherent imaging systems which use two complex images to form an interferogram. In the improved method, the interferogram of phase differences...
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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...
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5923279 |
Method of correcting an object-dependent spectral shift in radar interferograms
A method of correcting an object-dependent spectral shift in radar interferograms has two main procedures. In the first, the phase of the interferogram is reconstructed through phase unwrapping and...
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5923278 |
Global phase unwrapping of interferograms
An interferogram is an array of phases, often generated from the inverse tangent of a ratio of an imaginary component divided by a real component. The array is said to be a wrapped phase array when...
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5905456 |
Method of evaluating non-euclidean effects affecting an image acquired by a space radar and a satellite for implementing the method
A method of evaluating the phase shift associated with a wave emitted by a space radar propagating through the ionosphere. The method comprises the steps of forming first and second interferograms...
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5847673 |
System and method for determining a position of an object using output from a radar system
An inertial navigation system (INS) and a monopulse radar system are mounted on a body. The inertial navigation system outputs at least a velocity of the body. Either a synthetic aperture radar...
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5835055 |
Method for iterative disk masking and automatic error repair for phase unwrapping
Disclosed is a new alternative method for the phase unwrapping of the interferogram of two SAR (Synthetic Aperture Radar) images of the same area. This new method uses an iterative approach to the...
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5774089 |
Method to resolve ambiguities in a phase measurement
In a method to resolve ambiguities in a phase measurement for application in radar interferometry, a frequency estimation method is used, starting from conjugate complex products of pairs of...
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5767802 |
IFF system including a low radar cross-section synthetic aperture radar (SAR)
An IFF system including an interferometric ultra-high resolution synthetic aperture (SAR) radar located on an aircraft and a respective transponder located on one or more ground targets which may...
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5742250 |
Enhanced beamsplitting technique for use with three-dimensional synthetic array radar
A data processing method for use in processing synthetic array radar data to more accurately steer its antenna toward a target. A radar signal is transmitted, and sum and difference channel...
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5726656 |
Atmospheric correction method for interferometric synthetic array radar systems operating at long range
A method of computing and correcting phase errors due to atmospheric turbulence in a dual-antenna multiple-pass synthetic array radar (SAR) interferometer system. The method improves topographic...
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5677693 |
Multi-pass and multi-channel interferometric synthetic aperture radars
A method of providing accurate elevation data from three or more complex SAR images. A SAR vehicle is operated to produce a number of SAR images at different grazing angles. The present method...
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5659318 |
Interferometric SAR processor for elevation
An interferometric Synthetic Aperture Radar (SAR) system having a special-purpose processor to integrate motion compensation, interferogram coregistration, and a spectral shifting for optimal...
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5608405 |
Method of generating visual representation of terrain height from SAR data employing multigrid analysis
In a method of recovering data representing terrain height from a synthetic aperture radar system the phase data is unwrapped by a Gauss-Seidel relaxation technique applied to a least squares...
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5489907 |
Airborne SAR system for determining the topography of a terrain
In an airborne SAR system for determining the topography of a terrain, two complete, correlated SAR images with different amplitude modulation in the cross-track direction are obtained and recorded...
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5488374 |
Multi-scale adaptive filter for interferometric SAR data
Apparatus including a multi-scale adaptive filter for smoothing interferometric SAR (IFSAR) data in areas of low signal-to-noise ratio (SNR) and/or coherence while preserving resolution in areas of...
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5473331 |
Combined SAR monopulse and inverse monopulse weapon guidance
A system and method that provides for all-weather precision guidance of conventional air-to-surface weapons. The system and method employs a coherent monopulse radar disposed on a launch platform...
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5463397 |
Hyper-precision SAR interferometry using a dual-antenna multi-pass SAR system
The present invention is an interferometric SAR system and processing method that combines multi-pass SAR interferometry with dual-antenna SAR interferometry to obtain elevation maps with accuracy...
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5442364 |
Alignment and beam spreading for ground radial airborne radar
A method and apparatus for controlling a radar beam emitted by a radar sym. The invention produces improved high resolution ground mapping by aligning the antenna isogain or isonull lines with the...
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5430445 |
Synthetic aperture radar guidance system and method of operating same
A synthetic aperture radar guidance system adapted for use in a guided missile is described wherein the frequency of the transmitted pulses changes with time with a chirp slope which varies with...
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5424743 |
2-D weighted least-squares phase unwrapping
Weighted values of interferometric signals are unwrapped by determining the least squares solution of phase unwrapping for unweighted values of the interferometric signals; and then determining the...
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5424742 |
Synthetic aperture radar guidance system and method of operating same
A synthetic aperture radar guidance system adapted for use in a guided missile is described wherein the frequency of the transmitted pulses changes with time with a chirp slope which varies with...
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5334980 |
Method and system for sharpening impulse response in a synthetic aperture radar
A synthetic aperture radar system performing two dimensional monopulse measurement of the return data.
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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...
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5189424 |
Three dimensional interferometric synthetic aperture radar terrain mapping employing altitude measurement and second order correction
Synthetic aperture radar data is used in conjunction with altimeter data to produce a terrain map corrected for platform roll angle. The technique uses two synthetic radar antennas and a ranging...
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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...
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4978960 |
Method and system for real aperture radar ground mapping
A system for real beam radar ground mapping using a monopulse antennae to determine off-boresight angle of target returns. Off-boresight angle is converted to azimuth bins. After processing, return...
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4978961 |
Synthetic aperture radar with dead-ahead beam sharpening capability
A synthetic aperture radar is disclosed, having the capability of dead-ahead beam sharpening. A monopulse antenna having sum and difference ports is employed, generating from the radar returns sum...
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