Doppler signal processing circuitry

Details Doppler signal processing circuitry Doppler signal processing circuitry

1986-06-09

1987-03-03

Tubbesing, T. H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

342 99, 342194, 331 25, 331 12, H03L 710

Patent

active

046478744

ABSTRACT:
Circuitry is disclosed for processing Doppler-shifted radar signals or ot noisy signals which fluctuate widely in frequency. The circuitry includes a dual channel discriminator including a voltage controlled oscillator as part of a feedback loop for frequency tracking of said signals. The discriminator further includes a frequency pass circuit in one channel thereof and a frequency stop circuit in the other channel thereof, with the outputs of these circuits applied to a multiplier. The multiplier output controls the frequency of the voltage controlled oscillator. The voltage controlled oscillator output is heterodyned with the input signals to obtain the heterodyned signals for application to the aforementioned two channels of the discriminator.

REFERENCES:
patent: 3710386 (1973-01-01), Darboven et al.
patent: 4135191 (1979-01-01), Sawicki
patent: 4188589 (1980-02-01), Brown et al.

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