Phase comparison systems employing improved phaselock loop appar

Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled

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H03B 304

Patent

active

040706346

ABSTRACT:
A high-accuracy phase comparison system for noise-contaminated fixed-frequency input signals, such as Omega radionavigation signals, employs a pair of phaselock loops in which output pulses from a high-frequency oscillator are deleted at the frequency of a variable-frequency oscillator which is responsive to the detected phase difference between the associated input signal and an associated reference signal, thereby to provide a high-frequency intermediate signal which is frequency-divided to produce the reference signal continuously and free of noise. The relative phase of the input signals may be determined by phase-comparing the reference signals of the two phaselock loops or, to provide even higher precision, by phase-comparing the variable-frequency signals of the two loops.

REFERENCES:
patent: 3111671 (1963-11-01), Thompson
patent: 3319178 (1967-05-01), Broadhead, Jr.
patent: 3370251 (1968-02-01), Overstreet, Jr.
patent: 3805181 (1974-04-01), Charbonnier
patent: 3848199 (1974-11-01), Weber
patent: 3895311 (1975-07-01), Basse et al.

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