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Class Information
Number: 342/381
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Utilizing correlation techniques > Side lobe elimination > Difference of each antenna channel signal
Description: Subject matter wherein the receiving apparatus contain at least two antenna channels (main and auxiliary) which are connected to a subtraction circuit.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7876256 Antenna back-lobe rejection Jan. 25, 2011
7720472 Stratospheric-based communication system having interference cancellation May. 18, 2010
7231151 Cosite interference rejection system using an optical approach Jun. 12, 2007
7190746 Multiple lobe dot product detector for M-code GPS receivers Mar. 13, 2007
7183974 Methods and apparatus for increasing the effective resolving power of array antennas Feb. 27, 2007
7130663 Adaptive beam forming using a feedback signal Oct. 31, 2006
7127218 Scanning antenna diversity system for FM radio for vehicles Oct. 24, 2006
6653969 Dispersive jammer cancellation Nov. 25, 2003
6639551 Method of interference cancellation based on smart antenna Oct. 28, 2003
6473596 Close proximity transmitter interference limiting Oct. 29, 2002
6404821 Digital beamformer for receiving a first number of information signals using a second number of antenna array elements Jun. 11, 2002
6397083 Bootstrapped, piecewise-asymptotic directivity pattern control mechanism setting weighting coefficients of phased array antenna May. 28, 2002
6297772 Predicting coherent sidelobe canceller Oct. 2, 2001
6226531 High capacity broadband cellular/PCS base station using a phased array antenna May. 1, 2001
6188915 Bootstrapped, piecewise-asymptotic directivity pattern control mechanism setting weighting coefficients of phased array antenna Feb. 13, 2001
6166689 Adaptive beamformer with beam mainlobe maintenance Dec. 26, 2000
6061016 Method for the attenuation of the clutter coming from the reflection lobes of a radar antenna May. 9, 2000
5952965 Adaptive main beam nulling using array antenna auxiliary patterns Sep. 14, 1999
5694133 Adaptive direction finding system Dec. 2, 1997
5502448 Method and means for short pulse interference rejection Mar. 26, 1996
5493307 Maximal deversity combining interference cancellation using sub-array processors and respective delay elements Feb. 20, 1996
5442365 Technique for processing interference-contaminated radar energy Aug. 15, 1995
5371506 Simultaneous multibeam approach for cancelling multiple mainlobe jammers while preserving monopulse angle estimation accuracy on mainlobe targets Dec. 6, 1994
5369412 Sidelobe cancellation and diversity reception using a single array of auxiliary antennas Nov. 29, 1994
5363104 Jamming signal cancellation system Nov. 8, 1994
5361073 Determination of jammer range and azimuth by use of a coherent side lobe canceller system Nov. 1, 1994
5361074 Mainlobe canceller system Nov. 1, 1994
5351058 General purpose sidelobe canceller system Sep. 27, 1994
5343211 Phased array antenna with wide null Aug. 30, 1994
5296865 MTI compatible coherent sidelobe canceller Mar. 22, 1994
5291209 Coherent side lobe canceler Mar. 1, 1994
5226081 Multi-carrier communication system using ciphered carrier bit assignment information Jul. 6, 1993
4914442 Adaptive MTI target preservation Apr. 3, 1990
4893128 Troposcatter diversity sidelobe jamming suppressor Jan. 9, 1990
4893350 Interference cancellation system Jan. 9, 1990
4849764 Interference source noise cancelling beamformer Jul. 18, 1989
4689628 Adapive sidelobe canceller system Aug. 25, 1987
4688187 Constraint application processor for applying a constraint to a set of signals Aug. 18, 1987
4670885 Spread spectrum adaptive antenna interference canceller Jun. 2, 1987
4586045 Wide band multiple side-lobe canceller Apr. 29, 1986
4564935 Tropospheric scatter communication system having angle diversity Jan. 14, 1986
4555706 Simultaneous nulling in the sum and difference patterns of a monopulse radar antenna Nov. 26, 1985
4554548 Side-lobe suppressing unit for a pulse radar apparatus Nov. 19, 1985
4525716 Technique for cancelling antenna sidelobes Jun. 25, 1985
4489392 Orthogonalizer for inphase and quadrature digital data Dec. 18, 1984
4439770 Cascaded adaptive loops Mar. 27, 1984
4434424 Side lobe canceller for radar systems Feb. 28, 1984
4431999 Interference cancelling system using a notch and omnidirectional antenna Feb. 14, 1984
4316190 Secondary surveillance radar Feb. 16, 1982
4283729 Multiple beam antenna feed Aug. 11, 1981

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