Transponder for a moving vehicle tracking system

Details Transponder for a moving vehicle tracking system Transponder for a moving vehicle tracking system

1977-07-25

1979-05-29

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 4, 325305, 343100ST, G01S 956

Patent

active

041568737

ABSTRACT:
In a Doppler (frequency shift) spacecraft tracking system, a transponder mounted on the spacecraft including, two or more, receivers connected to spaced-apart antennas for receiving an RF tracking signal transmitted from a ground based station regardless of the attitude, or position, of the spacecraft. The intermediate frequency (IF) signals from the receivers are combined to provide a continuous third IF signal at the proper frequency and at a phase dependent upon the signals received, which third signal is utilized to control a transmitter for retransmitting coherent reply carrier frequency signals to the ground based station.

REFERENCES:
patent: 3242430 (1966-03-01), Ghose
patent: 3432853 (1966-03-01), Wise
patent: 3566274 (1971-02-01), DiToro
patent: 3986124 (1976-10-01), Mitchell, Jr.

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