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Class Information
Number: 342/406
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > With transmisson of bearing or position determinative signals > Tacan > Vor > Doppler > With circular array of antennas
Description: Subject matter wherein the antennas are arrayed in a ring shaped pattern.

Patents under this class:

Patent Number Title Of Patent Date Issued
8704712 System and method of generating a radio frequency signal Apr. 22, 2014
8031118 Phase correction apparatus, DVOR apparatus, and phase correction method Oct. 4, 2011
7428450 Method and system for using a database and GPS position data to generate bearing data Sep. 23, 2008
6329945 System for improved GPS accuracy using a sky map Dec. 11, 2001
6094166 Conical omni-directional coverage multibeam antenna with parasitic elements Jul. 25, 2000
4954835 Radiodirection finding method and apparatus using doppler effect frequency modulation Sep. 4, 1990
4434423 Doppler VOR Feb. 28, 1984
4382259 Device for supplying a radionavigation system of the Doppler VOR type and a Doppler VOR system comprising said device May. 3, 1983
4005427 Facility for monitoring the carrier-frequency and sideband signals radiated by a DVOR ground station Jan. 25, 1977
3999187 Doppler VOR beacons Dec. 21, 1976
3972044 Antenna system for Doppler VOR ground stations Jul. 27, 1976

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