Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1974-06-17
1976-09-14
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83R, 343113R, G01R 2500
Patent
active
039809480
ABSTRACT:
A vehicle location system is provided for determining the coordinate location of a vehicle through radio transmission radiation from the vehicle and the system includes a plurality of receiver sites at known coordinate locations each having antenna-coupler means providing first and second signals whose phase difference is approximately linearly related to the azimuth angle of the receiver signal from the radiation source. The first and second signals are processed at each receiver site to translate the frequency of the signals to a lower frequency and to remove the common frequency variations therefrom. Thereafter, the signals are passed through a phase detector which provides a binary output expression which is linearly related to the phase difference between the first and second signals. The binary expressions from each of the respective receiver sites are then processed through an electronic data processing means which is programed to determine the coordinates of the radiation source from the plurality of the binary expressions.
REFERENCES:
patent: 3469196 (1969-09-01), Cowin et al.
patent: 3600690 (1971-08-01), White
patent: 3622879 (1971-11-01), Girouy
patent: 3764903 (1973-10-01), Griswold
patent: 3820022 (1974-06-01), Watt
patent: 3863258 (1975-01-01), Clark
Duffield Charles F.
Rolinec R. V.
Tokar Michael J.
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