Reference timing signal apparatus and method

Details Reference timing signal apparatus and method Reference timing signal apparatus and method

2004-08-19

2008-09-09

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Receivers

Interrupted carrier wave

Reexamination Certificate

active

07424069

ABSTRACT:
A reference timing signal apparatus with a phase-locked loop has a computer algorithm which adaptively models the multiple frequencies of an oscillator following a training period. The oscillation frequency of the oscillator is controlled in response to a phase detector output. The computer algorithm processes the control signal applied to the oscillator. The computer algorithm updates the characteristics of the model relating to the aging and temperature of the oscillator, using for example, a Kalman filter as an adaptive filter. By the algorithm, the subsequent model predicts the future frequency state of the oscillator on which it was trained. The predicted frequency of the model functions as a reference to correct the frequency of the oscillator in the event that no input reference timing signal is available. In a case of using pre-processing infinite impulse response filters (IIRFs) before the adaptive processor, the time delay caused by the filters are compensated after the adaptive processor. Without pre-processing IIRFs, aging and temperature update rates are adaptively controlled by dynamically changing the rates depending upon the loop condition to achieve a wider tracking bandwidth. With the model updating algorithm, oscillators of low stability performance may be used as cellular base station reference oscillator.

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Penrod, “Adaptive Temperature Compensation of GPS Disciplined Quartz and Rubidium Oscillations”,IEEE International Frequency Control Symposium, 1996, pp. 980-987.

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