Phase comparison systems employing improved phaselock loop appar

Details Phase comparison systems employing improved phaselock loop appar Phase comparison systems employing improved phaselock loop appar

1974-06-17

1976-01-06

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328134, 331 16, 331 25, H03B 304

Patent

active

039315851

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: 3319178 (1967-05-01), Broadhead, Jr.
patent: 3611175 (1971-10-01), Boelke
patent: 3706039 (1972-12-01), Bott

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