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7626536 |
Non-scanning radar for detecting and tracking targets
Radar for detecting and tracking short range airborne targets using a non-scanning beam to illuminate the entire search space, and processing the return signals from a plurality of spaced apart...
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7612706 |
Monopulse radar apparatus and antenna switch
An antenna unit includes at least one transmission antenna and plural reception antennas. A receiver detects information including azimuth information for a target, based on an output from the...
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7577464 |
Compact antenna system for polarization sensitive null steering and direction-finding
A compact, non-phased-array, electronically reconfigurable antenna (ERA) system with at least two operational modes has a first operational objective that is polarization-sensitive null steering...
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7548189 |
Using radar targets of opportunity to build a monopulse calibration table
In a radar system, a monopulse calibration table is constructed from live targets of opportunity. A center of gravity or weighted average of normalized signals ΔV received at SUM and DIFF channels...
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7548186 |
Method and apparatus for detection of an electromagnetic signal reflected from and object
For detection of an electromagnetic signal, which is transmitted from a transmitting antenna ( 1 ), by means of at least two at least essentially identical receiving antennas ( 3, 4 ), whose...
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7535408 |
Apparatus and methods for detection of multiple targets within radar resolution cell
A method and apparatus is operative for multiple target detection in a radar system which employs a radar waveform of two or more frequency diverse subpulses. The apparatus adds coherent processing...
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7522120 |
Antenna apparatus of mobile communications terminal and operation method thereof
An antenna apparatus for a mobile communications terminal and its operation method in which the length of an antenna can be varied according to the changes in the usage environment. The antenna...
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7522097 |
Radar platform angular motion compensation
A method to compensate for radar platform angular motion may include measuring or estimating any radar platform angular motion. The method may also include substantially decoupling each array...
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7492306 |
Boundary crossing object detection system
An boundary monitoring apparatus comprising an object detection device arranged to transmit a signal into a detection region and to detect an object in said detection region upon receipt of a...
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7417584 |
Monopulse radar estimation of target altitude at low angles of elevation
A monopulse radar operating at low angles of elevation (LOE) receives returns from a target by a direct path and by a path including a reflection from that portion of the Earth's surface lying...
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7330149 |
Method for locating multiple angle sources using a monopulse radar
A monopulse radar tracking method which analyzes boresight error information provided a monopulse radar to determine a location for two targets. The monopulse radar tracking method analyzes the...
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7292179 |
Instantaneous passive range finding
A method and apparatus for use in determining the range in a single time sample from a platform to a target are disclosed. The method includes receiving radiation emanating from the target at two...
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7268724 |
Reduced-error monopulse processor
This monopulse processor provides target position information having an RMS error which is less than that of a conventional monopulse processor. A Σ±jΔ vs. Σ processor is modified to provide a...
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7262729 |
Radio detection and ranging intrusion detection system
A radar system having a processor, a waveform generator, a plurality of antenna interfaces, a set of first antennas configured to transmit a waveform, and a set of second antennas configured to...
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7250902 |
Method of generating accurate estimates of azimuth and elevation angles of a target for a phased—phased array rotating radar
A method and apparatus for generating accurate estimates of a radar target's azimuth and elevation angles for a phased-phased array rotating radar. Scan modulated coherently integrated (SMCI)...
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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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7218273 |
Method and device for boresighting an antenna on a moving platform using a moving target
A technique for boresighting an antenna mounted on a moving platform is described. The technique uses a concurrently moving calibration target. Target navigation data and platform navigation data...
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7218272 |
Reducing antenna boresight error
Reducing antenna boresight error includes receiving radar pulses reflected from the ground, where pulses are emitted from the antenna of a radar system, reflected by the ground, and received by the...
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7212152 |
Monopulse radar system
The present invention provides that a monopulse radar system to correct an amplitude error and a phase error developed between receiving channels and improve the accuracy of a detected angle. A...
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7205932 |
Method and apparatus for improved determination of range and angle of arrival utilizing a two tone CW radar
An improved system is provided for aiming a shotgun-based or other countermeasure system so as to be able to countermeasure incoming rockets or projectiles. In one embodiment a shotgun aimed and...
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7162200 |
Antenna calibration system and method
An antenna calibration system consists mainly of a signal source, an antenna, a first radio frequency mixer, a first local oscillator, an power detecting device, a personal computer, and a servo...
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7136014 |
System and method for estimating the azimuth pointing angle of a moving monopulse antenna
An invention is provided for determining the azimuth pointing angle of a moving monopulse antenna. Pulses of energy are broadcast at the surface of a planetary body. Reflected signals are received...
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7053815 |
Radar tracking system
A radar tracking system for an anti-aircraft, missile, including angle tracking, doppler tracking and range tracking feedback loops operating on sum and difference channels. Fast fourier transform...
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7038615 |
Efficient technique for estimating elevation angle when using a broad beam for search in a radar
A method and apparatus for estimating elevation angle when using a broad search beam such as a cosecant-squared beam is provided. The range of a target detected during a search with a broad beam...
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6937186 |
Main beam alignment verification for tracking antennas
A method for main beam alignment verification includes providing data pertaining to one or more patterns associated with an antenna, measuring power levels of a signal acquired by the antenna, and...
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6867726 |
Combining sidelobe canceller and mainlobe canceller for adaptive monopulse radar processing
An improvement in monopulse radar achieves nulling of a single mainlobe jammer and multiple sidelobe jammers while maintaining the angle measurement accuracy of the monopulse ratio by cascading a...
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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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6853329 |
Monopulse radar system
A monopulse radar system for detecting an azimuth depending upon amplitude difference or phase difference between signals respectively received by plural receiving antennas, includes: a...
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6801156 |
Frequency-agile monopulse technique for resolving closely spaced targets
A monopulse radar system generates elevation and azimuth difference monopulse estimates of the location of targets in each range cell, where the target may be either a single or plural target, each...
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6771205 |
Shipboard point defense system and elements therefor
A combined defense and navigational system on a naval vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational...
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6762711 |
Method for detecting target objects and for determining their direction and the like for a radar device
In a method for detecting target objects and determining their direction, range, speed and the like for a radar device, the invention provides that at least three transmitting and receiving devices...
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6753802 |
Null filter
An electronic circuit for use in an anti-radiation missile system of the type which uses the electromagnetic transmissions of a target radar for guidance information, detects when the missile has...
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6750804 |
System and method for detecting and estimating the direction of near-stationary targets in monostatic clutter using phase information
A system and method for detecting a target. The inventive method includes the steps of receiving a complex return signal of an electromagnetic pulse having a real and an imaginary component;...
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6697009 |
Adaptive digital beamforming architecture for target detection and angle estimation in multiple mainlobe and sidelobe jamming
A system and method for detecting a radar target of interest in the presence of radar jamming interference include a sub-array beamformer, a sum and difference beamformer, a weight calculator, a...
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6661366 |
Adaptive digital sub-array beamforming and deterministic sum and difference beamforming, with jamming cancellation and monopulse ratio preservation
A radar system and technique provide the capability to detect a target of interest and maintain the detection in the presence of multiple mainlobe and sidelobe jamming interference. The system and...
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6608584 |
System and method for bistatic SAR image generation with phase compensation
A method and bistatic synthetic aperture radar (SAR) imaging system generate an image of a target area without knowledge of the position or velocity of the illuminator. The system includes an...
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6603421 |
Shipboard point defense system and elements therefor
A combined defense and navigational system on a naval vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational...
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6568629 |
Method and device for magnetic guidance, especially for tracking targets
A process and a device for electromagnetic guidance of a craft, applied in particular to the tracking of targets. Guidance is carried out with respect to the axis of the beam of a monopulse...
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6567034 |
Digital beamforming radar system and method with super-resolution multiple jammer location
In a radar system, sampled aperture data are received from an antenna array. The sampled aperture data include data that do not correspond to echo returns from a beam transmitted by the antenna. A...
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6538597 |
Radar system having spoofer, blanker and canceler
A radar system including a blanker and a sidelobe canceler is described including an open loop nulling circuit for introducing one or more nulls in the main beam and a blanker beam. With this...
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6498582 |
Radio frequency receiving circuit having a passive monopulse comparator
A passive MMIC monopulse comparator includes a plurality of lumped element hybrids having pi and T filter structures. In one embodiment, a first hybrid receives first and second downcoverted...
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6476760 |
Device for detecting angle of elevation error in a multiple beam radar sensor
A method and a radar sensor for determining an elevation angle error of a multibeam radar sensor are described. In order to detect an elevation angle of the multibeam radar system with respect to a...
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6456238 |
Dynamic signal routing in electronically scanned antenna systems
An antenna array system with dynamic signal routing to a set of receivers. A monopulse electronically scanned antenna (ESA) has a plurality of antenna elements divided into subarrays. ESA beam...
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6404379 |
Matrix monopulse ratio radar processor for two target azimuth and elevation angle determination
A method and system for identifying the locations of plural targets lying within a main beam of a monopulse antenna including four ports for generating sum, elevation difference, azimuth difference...
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6377212 |
Radar apparatus employing a sidelobe blanking system
A method and apparatus are provided for determining whether a signal received the main channel ( 2 ) of an antenna ( 1 ) was incident on the antenna ( 1 ) in a direction corresponding to a high...
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6369746 |
Simultaneous nulling in low sidelobe sum and difference antenna beam patterns
A radar system includes a null processor coupled to transmit receive modules. The null processor inserts nulls in the sum pattern at locations for suppressing a jamming source. The null processor...
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6356231 |
Monopulse radar processor for resolving two sources
A method and system for identifying the locations of plural targets lying within the main beam of a monopulse antenna including four ports for generating sum, elevation difference, azimuth...
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6337656 |
Monopulse radar apparatus
A radar apparatus is provided which is capable of discriminating between azimuth angles of two or more targets moving side by side close to each other. The radar apparatus provides antenna beams...
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6320541 |
Off-axis indicator algorithm for electrically large antennas
A technique is described which makes novel use of monopulse data to augment the normal CFAR detection processing by incorporating monopulse data in a computationally simple way into the detection...
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6297763 |
Method of optimizing the coverage area of a sensor
A method is provided of optimizing, within an area which itself contains a number of part areas, the coverage of a sensor which has an angle-dependent range in a least one plane, and which sensor...
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