Dopplerizing a signal of varying frequency

Details Dopplerizing a signal of varying frequency Dopplerizing a signal of varying frequency

1966-12-28

1976-02-17

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

35 104, 340 5D, G01S 966, G09B 900

Patent

active

039394620

ABSTRACT:
The closed feedback loop of an oscillator contains a network (i.e. a resot circuit or filter) which has a distinct phase-frequency characteristic so as to cause an overall in-phase condition. In the subject feedback loop, shifting the phase of the feedback wave in the filter, the frequency of the oscillator will shift due to its double heterodyning circuit to reestablish a net zero phase shift around the loop. This oscillator is particularly adapted to shift a sonar signal frequency to simulate true doppler shift where this shift is a fixed percentage of the frequency.

REFERENCES:
patent: 2743362 (1956-04-01), Leed
patent: 3076151 (1963-01-01), Swanson
patent: 3164659 (1965-01-01), Abrams

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