The Limit of Frequency Estimation

Wei Guo

Abstract:	In phase and frequency. measurements, the measured phase and frequency are not the true phase and frequency but the ones which are disturbed by noises, due to the effects of the noise processes. In this paper, we discussed the effects of three noise processes, i.e., White PM, White FM and Random Walk FM, on the estimations of phase and frequency. It is indicated that the properties of these two estimations are very different. In phase estimation, the error can be reduced by properly selecting suitable smoothing length NT and smaple ,interval T. But in frequency estimation, the error cannot be reduced arbitarily by means of improving estimator or measurement equipment. The precison of frequency is limited by the intrinsic noises in the clock.
Published in:	Proceedings of the 24th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1992 Ritz-Carlton Hotel McLean, Virginia
Pages:	439 - 444
Cite this article:	Guo, Wei, "The Limit of Frequency Estimation," Proceedings of the 24th Annual Precise Time and Time Interval Systems and Applications Meeting, McLean, Virginia, December 1992, pp. 439-444.
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