Compact Digital Communications System. Part 3. Generalising the Phase Locked Loop

摘要

A generalization of the phase locked loop principle which eliminates the problem of carrier recovery when applied to phase shift signals is described. The system is tolerant of signal fading and shows orders of magnitude improvements in pull-in range and tracking performance over systems used in satcoms. Pull-in range exceeds 150 Hz in an absolute signal to noise ratio of worse than -10 dB. The loop tracks a 50 Baud PSK modulated carrier shifting at greater than 300 Hz/sec.