Adaptive carrier tracking circuit

Details Adaptive carrier tracking circuit Adaptive carrier tracking circuit

1986-03-17

1987-09-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

329 50, 329122, 329124, 331 17, 331 25, 375 83, 375120, H03L 710

Patent

active

046911766

ABSTRACT:
An adaptive carrier tracking circuit for receiving pulse code modulated communications which have passed through a scintillation environment is disclosed. The rate and magnitude of phase or frequency fluctuations of the input signal are detected and the bandwidth of a circuit filter is adjusted in response to an estimated decorrelation time to optimize the signal tracking and bit error rate for the circuit. The adaptive carrier tracking circuit may be applied to communication systems tracking circuits utilizing phase-locked loops or modified Costas loops for phase tracking, or automatic frequency control loops for frequency tracking.

REFERENCES:
patent: 4072905 (1978-02-01), Keelty
patent: 4096360 (1978-06-01), Takahashi et al.
patent: 4135164 (1979-01-01), Kurata
patent: 4336616 (1982-06-01), Carson et al.
patent: 4479091 (1984-10-01), Yoshisato

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