Homodyne communication system

Details Homodyne communication system Homodyne communication system

1975-05-12

1976-10-05

Tubbesing, T.H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 6A, 343 68LC, G01S 956

Patent

active

039848353

ABSTRACT:
A homodyne communication system comprising an interrogating unit and a plurality of responsive remote units wherein a continuous wave RF signal is transmitted from the interrogating unit to illuminate a remote unit. The remote unit causes a return (reply) signal to be transmitted or reflected back to the interrogating unit. A sample of the transmitted (interrogation) signal is mixed with the return signal. Amplitude nulls in the mixer output signal at given relative phase relationships between interrogation and reply signals, are substantially eliminated by selectively shifting the relative phase of the signals. Also disclosed are a homodyne communication system utilizing phase modulation to impress FSK signaling on the reply signal and an automatic vehicle location system utilizing the present invention.

REFERENCES:
patent: 3798641 (1974-03-01), Preti
A. R. Koelle et al.; Short-Range Radio Telemetry for Electronic Identification Using Modulated RF Backscatter; Proceedings of the IEEE; Aug. 1975.

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