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Class Information
Number: 342/384
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Utilizing correlation techniques > Difference of each antenna channel signal
Description: Subject matter wherein the receiving apparatus contains at least two antenna channels (main and auxiliary) which are connected to a subtraction circuit.

Patents under this class:

Patent Number Title Of Patent Date Issued
8599861 Active antenna array and method for relaying radio signals Dec. 3, 2013
8427371 RF feed network for modular active aperture electronically steered arrays Apr. 23, 2013
8217794 Active RFID system for port logistics using multi-hop communication and communication method in the system Jul. 10, 2012
8009095 Antenna array and a method for calibration thereof Aug. 30, 2011
7652623 Null-fill antenna, omni antenna, and radio communication equipment Jan. 26, 2010
7340281 Method and system for enhancing reception of wireless communication signals Mar. 4, 2008
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
7136012 Approach radar with array antenna having rows and columns skewed relative to the horizontal Nov. 14, 2006
7030813 Array antennas with independent sum and difference excitations levels Apr. 18, 2006
6788251 Method and apparatus for interference reduction in a positioning system Sep. 7, 2004
6720908 Sensor front-end for range and bearing measurement Apr. 13, 2004
6297772 Predicting coherent sidelobe canceller Oct. 2, 2001
6208296 Method and apparatus for training a receiver on a source Mar. 27, 2001
6127973 Signal processing apparatus and method for reducing the effects of interference and noise in wireless communication systems Oct. 3, 2000
6061016 Method for the attenuation of the clutter coming from the reflection lobes of a radar antenna May. 9, 2000
5694133 Adaptive direction finding system Dec. 2, 1997
5635939 Device and method of using an auxiliary antenna outfitted with an adaptive space filter for anti-jamming a major associated antenna Jun. 3, 1997
5578933 Distance measuring system Nov. 26, 1996
5579016 Phased array multiple area nulling antenna architecture Nov. 26, 1996
5510796 Apparatus for wind shear compensation in an MTI radar system Apr. 23, 1996
5502448 Method and means for short pulse interference rejection Mar. 26, 1996
5491487 Slaved Gram Schmidt adaptive noise cancellation method and apparatus Feb. 13, 1996
5363104 Jamming signal cancellation system Nov. 8, 1994
5361074 Mainlobe canceller system Nov. 1, 1994
5359329 Jammer reference target measurement system Oct. 25, 1994
5351058 General purpose sidelobe canceller system Sep. 27, 1994
5296865 MTI compatible coherent sidelobe canceller Mar. 22, 1994
5291209 Coherent side lobe canceler Mar. 1, 1994
5260707 Phase coherent interference signal suppression system and method Nov. 9, 1993
H1033 Anti-jamming system for tracking and surveillance radar Mar. 3, 1992
5049890 Sampled data processing Sep. 17, 1991
5027123 Adaptive interference canceller Jun. 25, 1991
H792 Mainlobe canceller with motion compensation for use with radar systems Jun. 5, 1990
H739 Auxiliary antenna interference canceller Feb. 6, 1990
H740 Antenna sidelobe interference canceller Feb. 6, 1990
4893128 Troposcatter diversity sidelobe jamming suppressor Jan. 9, 1990
4885590 Blind speed elimination for dual displaced phase center antenna radar processor mounted on a moving platform Dec. 5, 1989
4849764 Interference source noise cancelling beamformer Jul. 18, 1989
4713668 Adaptive antenna Dec. 15, 1987
4697188 Interference canceler with difference beam Sep. 29, 1987
4689628 Adapive sidelobe canceller system Aug. 25, 1987
4688187 Constraint application processor for applying a constraint to a set of signals Aug. 18, 1987
4638318 Small angular beamwidth antenna system Jan. 20, 1987
H190 Notch antenna for a radio communications system Jan. 6, 1987
4608569 Adaptive signal processor for interference cancellation Aug. 26, 1986
4516126 Adaptive array having an auxiliary channel notched pattern in the steered beam direction May. 7, 1985
4347514 Troposcatter system antenna alignment Aug. 31, 1982
4214244 Null pattern technique for reduction of an undesirable interfering signal Jul. 22, 1980
3935575 Circuitry for determining direction of impingement of a received signal Jan. 27, 1976

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