Circuit for reversing doppler signal modifying a carrier

Details Circuit for reversing doppler signal modifying a carrier Circuit for reversing doppler signal modifying a carrier

1975-09-24

1976-11-09

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 4, 325 17, 325421, 343179, H04B 112, HO4B 360

Patent

active

039913724

ABSTRACT:
A doppler signal modifying a carrier wave has its sign reversed by a circ which includes a pair of signal sources whose frequencies are above and below that of the carrier by equal amounts. The original signal and one of these sources control a first flip-flop, while the other source and a voltage controlled oscillator, whose frequency is normally set to that of the carrier, control a second flip-flop. The square waves thus produced, which have frequencies corresponding to the difference in frequency between the control signals, are applied in particular combinations to a pair of exclusive OR gates, whose outputs are integrated and then combined in opposition to develop an error signal which controls the voltage controlled oscillator. The output of this oscillator, when this error signal is minimized, is the desired signal.

REFERENCES:
patent: 3450842 (1969-06-01), Lipke
patent: 3766481 (1973-10-01), Rodgers
patent: 3800231 (1974-03-01), Pratt
patent: 3864634 (1975-02-01), Dragonetti

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