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| Number | Title | Issue Date |
| 7843376 | Cross-eye jamming detection and mitigation The invention includes, in its various aspects and embodiments, a method and apparatus for detecting cross-eye jamming. In some embodiments, the invention includes mitigating cross-eye jamming once its presence is detected. ... | 11/30/2010 |
| 7379708 | Mobile receiver A mobile receiver apparatus is provided where its antenna directivity is controllably determined for improving the response to a desired signal as it moves and its surrounding geographical features and thus its environment for signal reception are varied. The mobile... | 05/27/2008 |
| 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 boresight error information to determine an angle of arrival for a domin... | 02/12/2008 |
| 7317427 | Adaptive array An adaptive antenna array has array elements arranged in element rows and element columns and subarrays arranged in subarray rows and subarray columns, for which the subarray phase centers have non-uniform spacing. The adaptive antenna array provides good detection ... | 01/08/2008 |
| 7315728 | Polarized wave measuring apparatus, and antenna characteristic measuring apparatus and radio wave measuring apparatus using the same A phase shift section phase-shifts the second band-restricted signal to a first phase-shifted signal and a second phase-shifted signal having a phase that is different from the phase of the first phase-shifted signal by 90 degrees. A first signal mixing section mixe... | 01/01/2008 |
| 7280627 | Constrained data-adaptive signal rejector A constrained data-adaptive signal rejector suppresses signals received through the side lobes of a sensor array while preserving signals received through the main lobes. A main beam is formed in a typical signal processing architecture. A subset of the original ind... | 10/09/2007 |
| 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 position output signal equal to the smaller in absolute magnitude of ... | 09/11/2007 |
| 7212158 | Method and apparatus for beamforming based on broadband antenna A beamforming method based on broadband antenna is provided, comprising: detecting the frequency of input signals of an antenna; determining the effective antenna aperture between elements of the antenna array according to the detected frequency; computing the weigh... | 05/01/2007 |
| 7212563 | Real-time locating system and method using timing signal A location system includes a plurality of signal readers for receiving signals from a wireless transmitter to be located. The signals include a wideband, spread spectrum signal and a timing marker appended a predetermined time in front of the wideband, spread spectr... | 05/01/2007 |
| 7190305 | Radar apparatus In a radar apparatus, a receiving antenna includes a plurality of antenna elements, each receiving, as a reception signal, radio waves emitted into space and reflected off a target object. An analog signal is obtained by downconverting and putting a bandwidth constr... | 03/13/2007 |
| 7155230 | Dynamic frequency selection and radar detection with a wireless LAN A receiver in a wireless communication system detects a possibly interfering radar signal, and uses dynamic frequency selection to switch to a non-interfering channel. The power level and the channel of the radar signal may be detected. When a radar signal that exce... | 12/26/2006 |
| 7151508 | Antenna system and RF signal interference abatement method Disclosed is an antenna system including a Luneberg Lens having a spherically shaped outer surface and a spherically shaped focal surface spaced from its outer surface with a plurality of patch antenna elements disposed along the focal surface of the Luneberg Lens; ... | 12/19/2006 |
| 7136012 | Approach radar with array antenna having rows and columns skewed relative to the horizontal A monopulse precision landing or other land-based radar system uses an array antenna and a beamformer to produce sum, azimuth difference and elevation difference beams relative to the array. The rows and columns of the array are skewed relative to the horizontal for... | 11/14/2006 |
| 7126526 | Phased null radar A method for reducing the interference between a source transmitting pulses and equipments having nominal bandwidths which are outside the nominal bandwidth of the transmitted pulses, but which respond to sideband energy of the pulses. Phase perturbations are applie... | 10/24/2006 |
| 7117018 | Array beamforming with wide nulls A method and implementation of wireless communication are disclosed in which wireless signals are exchanged between at least one remote client and a directional antenna array associated with a wireless network, wherein the directional antenna array includes a plural... | 10/03/2006 |
| 7068209 | System and method for detecting and jamming emitter signals A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. In one embodiment, the scan strategy may be computed to operate in a manner cognizant of on-board active jamme... | 06/27/2006 |
| 7009560 | Adaptive variable true time delay beam-forming system and method System and method for signal processing and beam forming. A system for processing signals includes a first phase shifter, a second phase shifter, a first variable time delay system, and a second variable time delay system. Additionally, the system includes a first s... | 03/07/2006 |
| 7009557 | Interference rejection GPS antenna system The present invention relates to a method and apparatus for selectively receiving radio frequency (RF) signals which utilizes an array of antenna elements including a center antenna for receiving the RF signal, a navigational controller using coordinate information ... | 03/07/2006 |
| 7006040 | Steerable antenna and receiver interface for terrestrial broadcast Antennas with steerable antenna patterns and techniques for using such antennas are described. In accordance with the invention, antenna patterns with one or more NULLs are used. Through the use of digital control signals the antenna pattern is steered so that a sou... | 02/28/2006 |
| 6968171 | Adaptive noise reduction system for a wireless receiver A receiver with reduced near field noise is described. The receiver has a far range receiving section configured to sense a desired signal that includes near field noise. The receiver further includes a near range receiving section configured to sense a near field n... | 11/22/2005 |
| 6930637 | Method and apparatus for high resolution tracking via mono-pulse beam-forming in a communication system Method and apparatus for high resolution tracking via mono-pulse beam-forming in a communication system in which the capacity and range of mobile or fixed wireless communication base stations are improved by implementing a single or multiple antenna beam per signal ... | 08/16/2005 |
| 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 multiple sidelobe canceller and a mainlobe canceller, and imposing a m... | 03/15/2005 |
| 6861977 | Agile PRT deconvolution method and systems, and its uses This invention relates to radar signal processing. In particular, this invention concerns signal processing of agile Pulse Repetition Time (PRT) sampled signal transmitted using spread spectrum technique. This invention solves, in particular, the incompatibility bet... | 03/01/2005 |
| 6839017 | Method and apparatus for using anti-jam technology to determine the location of an electromagnetic radiation source A system employs null angle measurements developed in response to the detection of radiation, such as jamming, along with the positions at which the null angles are measured, to determine the location of the radiation source through reverse triangulation. ... | 01/04/2005 |
| 6768444 | Method of interference suppression in a radar system The invention relates to a method of interference suppression in a radar system (10) and also to a system (10) operating according to the method. The system (10) incorporates a first antenna (40) and associated electronic circuits for emitting i... | 07/27/2004 |
| 6748351 | Modular covert remote electronic warfare simulator An apparatus for electronic warfare signal simulation which is used in an external test system to simultaneously test a plurality of “victim” communication systems for vulnerability to jamming. The test system includes a remote radiator of a signal free of jammi... | 06/08/2004 |
| 6731233 | Method of suppressing jammer signals In a method of suppressing jammer signals in the received signal of radar antennas of HPRF applications (such as pulse Doppler radar systems) by means of Fast Fourier Transformation and side lobe cancellation, the receiving radar antenna has a sum channel, a differe... | 05/04/2004 |
| 6717543 | Radar device for object self-protection In regard to radar guidance of a launch container (15) for fragmentation projectiles (16) for defending against an attacking missile (12), from the object (11) to be protected, the present invention affords a radar guidance system which c... | 04/06/2004 |
| 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 composite beamformer, and a monopulse ratio calculator. A pl... | 02/24/2004 |
| 6674390 | Shipboard point defense system and elements therefor A pulse Doppler radar receiver is disclosed wherein monopulse sum and difference signals are time-multiplexed and passed through a single gain-controlled amplifier channel for normalization, the sum signal being processed to provide both a D.C. gain contr... | 01/06/2004 |
| 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 technique utilize digital beamforming to form sub-arrays f... | 12/09/2003 |
| 6653973 | Adaptive digital beamforming radar method and system for maintaining multiple source angle super-resolution capability in jamming A method and system for are provided for detecting one or more radar targets of interest in the presence of jamming signals. A plurality of sub-arrays are formed from an antenna array. Sub-array beams are adaptively formed so as to point one or more nulls... | 11/25/2003 |
| 6653969 | Dispersive jammer cancellation Generating a secondary beam (11) slightly offset from the main data collection beam (9) and obtaining hot clutter reference to be used in a conventional side lobe jammer processing algorithm (31). Advantage is taken of the typical geometries of a standoff... | 11/25/2003 |
| 6650270 | Radar system The present invention describes a system for counteracting countermeasures against radar detection. Two known countermeasures are "phase front tilting" and "isotropic scattering." The invention accomplishes this counteraction by deliberately producing a t... | 11/18/2003 |
| 6650271 | Signal receiver having adaptive interfering signal cancellation A radar system receiver having an antenna system adapted to receive a jammer signal from both a direct path and from an indirect path. The direct and indirect paths have both differential Doppler frequency and differential time delay induced phase shifts.... | 11/18/2003 |
| 6580392 | Digital beamforming for passive detection of target using reflected jamming echoes A radar system and method for detecting and tracking a target of interest in the presence of interference, wherein the interference emits interfering signals, includes a receiver for receiving the interfering signals directly from the interference. The re... | 06/17/2003 |
| 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 arrangement, the blanker can be operated even in the presence o... | 03/25/2003 |
| 6518912 | Signal processing circuit A signal processing circuit is disclosed for providing fuze-on-jam capability in a target detecting device, while in the presence of continuous wave or continuous wave noise jammer signals. A target detection system will protect the target detecting devic... | 02/11/2003 |
| 6486824 | Tracking radar receiver A tracking radar receiver as described herein is relatively invulnerable to image frequency jamming. Partial image-rejection down-converters down-convert RF signals to IF signals in each of various sum and difference receiver channels. Image frequency com... | 11/26/2002 |
| 6480139 | Jammer counting using cholesky factor diagonal elements A method and system for using the main diagonal elements of the Cholesky factor of the spatial covariance matrix to estimate the number of jammers present, by evaluating the AIC (or other) test function using the Cholesky diagonal elements in place of cov... | 11/12/2002 |
