Adaptive carrier tracking circuit

摘要

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.