Sample data phase locked loop for adaptive doppler tracker

Details Sample data phase locked loop for adaptive doppler tracker Sample data phase locked loop for adaptive doppler tracker

1981-12-03

1985-04-23

Griffin, Robert L.

Pulse or digital communications

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Direct sequence

343 7PL, 375 77, H03D 1300

Patent

active

045134294

ABSTRACT:
Precise phase acquisition and tracking of a data modulated pulse signal in order to recover the data in a low signal to noise ratio environment is achieved by a sample data phase locked loop that is adaptive, second order, and uses baseband polar coordinate processing. The circuit utilizes an adaptive second order loop where the loop bandwidth can be adjusted by a coherence measurement. This provides wide bandwidths during initial acquisition, medium bandwidths during acquisition/track transition and narrow bandwidth during tracking.

REFERENCES:
patent: 3986123 (1976-10-01), Tirro et al.
patent: 4079329 (1978-03-01), England et al.
patent: 4243941 (1981-01-01), Zdunek

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