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Class Information
Number: 342/101
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Return signal controls radar system > Receiver > Frequency > Doppler frequency tracking > With filter control
Description: Subject matter wherein the returned signal is used to vary the center frequency or the bandwidth of a receiver filter circuit.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8170824 System and method for determining distance with precision in the presence of multipath interference May. 1, 2012
8116408 Gain control for reduced interframe spacing (RIFS) Feb. 14, 2012
8085186 Probabilistic classifier Dec. 27, 2011
7876262 Radar system Jan. 25, 2011
7843382 Mismatched filter Nov. 30, 2010
7841746 Light source device, lighting device, projector, and monitoring device Nov. 30, 2010
7741992 Moving target detector for radar systems Jun. 22, 2010
7646331 Radar detector and collision avoidance system interface Jan. 12, 2010
7535403 Method of determining the velocity field of an air mass by high resolution doppler analysis May. 19, 2009
7474262 Digital beamforming for an electronically scanned radar system Jan. 6, 2009
7411543 Maximum-likelihood rocket identifier Aug. 12, 2008
7336218 Radar system with peak frequency analysis and window functions Feb. 26, 2008
7327308 Programmable method and test device for generating target for FMCW radar Feb. 5, 2008
7053815 Radar tracking system May. 30, 2006
7026980 Missile identification and tracking system and method Apr. 11, 2006
6975264 Signal separating system Dec. 13, 2005
6967613 Broadband waveform reconstruction for radar Nov. 22, 2005
6536893 Waterfast and smearfast inks using ink jet delivered dye sublimation dyes Mar. 25, 2003
6411250 Electromagnetic sensor system Jun. 25, 2002
6389084 Apparatus and method for equalizing a signal independent of the impact of doppler frequency May. 14, 2002
6297764 Radar receiver having matched filter processing Oct. 2, 2001
6211815 Coherent radar detection using non-coherent architecture Apr. 3, 2001
6204802 Apparatus for detecting relative velocity Mar. 20, 2001
6052421 Method for separating a desired signal from an interfering signal Apr. 18, 2000
6049302 Pulsed doppler radar system with small intermediate frequency filters Apr. 11, 2000
6040796 Radar system installable in an automotive vehicle for detecting a target object Mar. 21, 2000
6018311 Noncoherent gain enhancement technique for improved detection-estimation performance Jan. 25, 2000
5926125 Synthetic aperture radar Jul. 20, 1999
5864313 Process for determining the intermediate frequency deviation in frequency pulsed radar systems Jan. 26, 1999
5852418 Notched-spectrum swept-frequency generator and method therefor Dec. 22, 1998
5796364 Method of determining the velocity of a radar target Aug. 18, 1998
5790068 AFC control switching circuit Aug. 4, 1998
5661487 Digital center line filter Aug. 26, 1997
5657026 Beacon signal receiving system Aug. 12, 1997
5644315 Doppler ratio detection radar with range CFAR Jul. 1, 1997
5481270 Radar with adaptive range sidelobe suppression Jan. 2, 1996
5473332 RFI suppression circuit and method Dec. 5, 1995
5467091 Radar and other communication systems having large bandwidth and large dynamic range Nov. 14, 1995
5376940 Helicopter recognition radar processor Dec. 27, 1994
5345470 Methods of minimizing the interference between many multiple FMCW radars Sep. 6, 1994
5325098 Interacting multiple bias model filter system for tracking maneuvering targets Jun. 28, 1994
5313212 Track filter bias estimation May. 17, 1994
5214433 Two-stage target tracking system and method May. 25, 1993
5191337 Ranging, detection and resolving in a multislope frequency modulated waveform radar system Mar. 2, 1993
5189426 Doppler frequency spectrum de-emphasis for automotive collision avoidance radar system Feb. 23, 1993
5181038 Target persistence filter for multi-frequency automotive radar system Jan. 19, 1993
5177487 Sea velocity evaluator Jan. 5, 1993
5173706 Radar processor with range sidelobe reduction following doppler filtering Dec. 22, 1992
5047778 FMCW radar range tracker and method Sep. 10, 1991
5012253 Radar receiver Apr. 30, 1991

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