Adaptive variable-gain phase and frequency locked loop for rapid

Details Adaptive variable-gain phase and frequency locked loop for rapid Adaptive variable-gain phase and frequency locked loop for rapid

1992-09-30

1995-09-12

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375345, 375376, 4552341, 455260, 4551822, 4551922, 331 11, 331 34, 331 1A, H04L 2706

Patent

active

054504473

ABSTRACT:
An apparatus and method for improving the performance of a satellite communications modem is disclosed. The invention is particularly applicable to mobile satellite receivers, and includes a variable-gain automatic frequency controlled (AFC) loop, the gain of which is controlled adaptively, based on the AFC lock status and the lock status of the modem's inner loop, in addition to other parameters determined by the invention.

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A. Mileant and S. Hinedi, Analysis of Lock Detection in Costas Loops, Technical Support Package for NASA Tech brief, vol. 15, No. 7, Item No. 86, Jul. 1991, JPL Invention Report, NPO-18102/7612.
Charles R. Cahn, Improving Frequency Acquisition of a Costas Loop Dec. 1977, pp. 1453-1459.

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