Frequency time standard failure monitor

Details Frequency time standard failure monitor Frequency time standard failure monitor

1984-11-13

1986-04-15

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 14, 331 17, 331 49, 331DIG2, H03L 700, H03B 2800

Patent

active

045830541

ABSTRACT:
A frequency time standard monitoring system includes three highly accurate standards of substantially identical frequency. These three standards are compared in pairs by three monitoring apparatus. Each such apparatus includes a fine window detector for determining the phase relationship between the two applied frequency standard clock signals, and a phase shifter responsive to the fine window detector for shifting the phase of one of the signals until the signals are phase aligned. When this occurs, the fine window detector is disabled and a coarse window detector monitors the two clock signals to ensure that the clocks do not drift beyond tolerable limits. The output signal of the coarse window detector is applied, along with the corresponding signals from the other two monitoring apparatus, to a select logic which determines which standard should be on-line in the event of a fault detection.

REFERENCES:
patent: 4330854 (1982-05-01), Zeitraeg
patent: 4521745 (1985-06-01), Falconer

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