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Class Information
Number: 342/445
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > Direction-finding receiver only > Having more than two antennas
Description: Subject matter wherein the direction finding receiver is coupled to more than two antennas.

Sub-classes under this class:

Class Number Class Name Patents
342/446 Unequal distance between at least three antennas 19

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8665153 Array signal processing device Mar. 4, 2014
8587432 Electronic article surveillance systems, apparatus, and methods Nov. 19, 2013
8532581 Wireless communication apparatus and method for selecting quality-reporting sub-carrier bands based on sub-carrier band quantity information from base station Sep. 10, 2013
8450997 Electromagnetic position and orientation sensing system May. 28, 2013
8401488 Transient RF detector and recorder Mar. 19, 2013
8373596 Detecting and locating RF emissions using subspace techniques to mitigate interference Feb. 12, 2013
8179319 Adaptive optimization of estimation of the angle of arrival of a signal received by an array of antenna elements May. 15, 2012
8035562 Digital beam-forming apparatus and technique for a multi-beam global positioning system (GPS) receiver Oct. 11, 2011
8022874 Method and system for detecting signal sources in a surveillance space Sep. 20, 2011
8022873 Methods and system for determining angles of sight between two devices Sep. 20, 2011
7982672 Reception device Jul. 19, 2011
7756471 Systems and methods for multi-element antenna arrays with aperture control shutters Jul. 13, 2010
7705781 Histogram for ambiguity visualization and evaluation (HAVE) Apr. 27, 2010
7692586 Sparse interferometric array for radio frequency azimuth direction finding Apr. 6, 2010
7683757 Multi-antenna system and method for remotely controlling a function Mar. 23, 2010
7450922 Data unit detection including antenna diversity Nov. 11, 2008
7440758 Cell planning methods and apparatus, and networks configured based on same Oct. 21, 2008
7436358 Signal arrival direction deducing device, signal arrival direction deducing method, and signal direction deducing program Oct. 14, 2008
7409227 Radio apparatus Aug. 5, 2008
7382275 Mobile enforcement reader Jun. 3, 2008
7380455 System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals Jun. 3, 2008
7213442 Methods of arranging transducers and transducer arrays having reduced phase ambiguity for determining direction of arrival of received signals May. 8, 2007
7201054 System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals Apr. 10, 2007
7092673 Angle of arrival estimation in a wireless telecommunications network Aug. 15, 2006
7081847 Radar system with switchable angular resolution Jul. 25, 2006
7010304 Cell planning methods and apparatus, and networks configured based on same Mar. 7, 2006
7002461 Passive RFID transponder/machine-mounted antenna and reader system and method for hidden obstacle detection and avoidance Feb. 21, 2006
6972663 Method for detecting portable objects and system for carrying out said method Dec. 6, 2005
6950064 System and method for ascertaining angle of arrival of an electromagnetic signal Sep. 27, 2005
6914559 Direction finding method and system using digital directional correlators Jul. 5, 2005
6907270 Method and apparatus for reduced rank channel estimation in a communications system Jun. 14, 2005
6897807 Radio-wave arrival-direction estimating apparatus and directional variable transceiver May. 24, 2005
6834251 Methods and devices for identifying, sensing and tracking objects over a surface Dec. 21, 2004
H2109 Passive microwave direction finding with monobit fourier transformation receiver and matrix coupled antenna Sep. 7, 2004
6774845 Single receiver wireless tracking system Aug. 10, 2004
6765532 Wideband signal detection and tracking system Jul. 20, 2004
6700536 System and method for determining a direction of incident electromagnetic signals Mar. 2, 2004
6664921 Apparatus for receiving ranging signals Dec. 16, 2003
6621417 Passive RFID transponder/reader system and method for hidden obstacle detection and avoidance Sep. 16, 2003
6407702 Method and system for obtaining direction of an electromagnetic wave Jun. 18, 2002
6392598 Cable phase calibration in a TCAS May. 21, 2002
6388604 Circuit for LPI signal detection and suppression of conventional pulsed signals May. 14, 2002
6377214 Pipelined processing algorithm for interferometer angle of arrival estimation Apr. 23, 2002
6351238 Direction of arrival estimation apparatus and variable directional signal receiving and transmitting apparatus using the same Feb. 26, 2002
6313794 Method of detection and determining an angular location of frequency agile emitters Nov. 6, 2001
6278406 Direction finder and device for processing measurement results for the same Aug. 21, 2001
6255991 Low cost angle of arrival measurement system Jul. 3, 2001
6239747 Antenna system and method for direction finding May. 29, 2001
6225949 Method and apparatus for a ring interferometer May. 1, 2001
6195043 AOA estimation and polarization induced phase correction using a conformal array of titled antenna elements Feb. 27, 2001

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