Patent ID: 7786924
Filing Date: 2010-08-31
Classification: G01S

Abstract:
1. A Doppler VHF omidirectional radio range (DVOR) apparatus comprising: a main device comprising at least one RF sideband transmitter connected to at least one directional coupler, within the main device, which has an output connected to a signal generation circuit, within the main device, whose output is connected to a modulation signal generation and antenna monitor circuit, within the main device; a distributor connected by cable to the at least one directional coupler and which receives a progressive RF sideband signal from the at least one directional coupler and returns reflected RF sideband signal to the at least one directional coupler, the distributor being connected to, and receiving a switching signal from, the modulation signal generation and antenna monitor circuit, the switching signal driving the distributor; and a plurality of sideband antennas connected to, and receiving respective progressive RF sideband signals distributed spatially and temporally from, the distributor, the signal generation circuit providing comparison output signals representative of the power level differences between each progressive RF sideband signal and each progressive RF sideband signal's corresponding reflected RF sideband signal caused by reflections from one of the plurality of sideband antennas, as well as providing switching signals indicative of an identity of each sideband antenna from which each reflection is obtained, and the modulation signal generation and antenna monitor circuit processing the comparison output signals and the switching signals to provide an output identifying any faulty sideband antenna.