Method for synchronization of a signal frequency to interference

Details Method for synchronization of a signal frequency to interference Method for synchronization of a signal frequency to interference

1989-05-26

1990-04-03

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, H03L 700

Patent

active

049144049

ABSTRACT:
Process for synchronization of a frequency to an interference-prone reference frequency. Loss of the steady-state phase relationship between frequency and reference frequency which is maintained during the control process because of either phase shifts or necessary switching to another reference frequency causes a permanent phase deviation (random walk) in some cases because of the interference-prone reference frequencies until the steady-state phase relationship is restored. In order to prevent random walk or to avoid having to terminate the phase relationship, initially an offset value is generated by the microprocessor upon occurrence of a phase shift which exceeds a predetermined threshold and prevents the effect of the phase shift on the control process, and secondly, each reference frequency is assigned its own phase discriminator by means of which the trend in the phase relationship of the frequency in comparison with each reference frequency is known by the microprocessor, so that the microprocessor can take suitable control measures in the event it is necessary to switch to a different reference frequency.

REFERENCES:
patent: 4511859 (1985-04-01), Dombrowski

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