Phase and frequency matching based phase difference estimation method for non-integer periods&nbsp; sampling signals

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (6) : 7-10.

Phase and frequency matching based phase difference estimation method for non-integer periods sampling signals

TU Yaqing1,SHEN Yanlin1,2,SHEN Ting’ao1,CHEN Baoxin1

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Abstract

To improve the precision and anti-interference performance of phase difference estimation for non-integer periods sampling signals,a phase and frequency matching based phase difference estimation method was proposed.The phase difference estimation was obtained by means of the segmented Hilbert transform to suppress the effect of non-integer periods sampling sinusoidal signals on the Hilbert transform.The simulation results demonstrate that compared with the methods of cross-correlation,Hilbert transform and data extension-based correlation, the proposed method has better phase difference estimation performance for non-integer periods sampling signals in terms of its estimation precision and anti-interference performance.Its phase difference estimation errors are closer to Cramer-Rao lower bound (CRLB).The measurement experiments on the flow rates of Coriolis mass flowmeter validate the effectiveness of the proposed method.

Key words

phase difference estimation / phase and frequency matching / non-integer periods / sampling / segmented Hilbert transform

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TU Yaqing1,SHEN Yanlin1,2,SHEN Ting’ao1,CHEN Baoxin1 . Phase and frequency matching based phase difference estimation method for non-integer periods sampling signals[J]. Journal of Vibration and Shock, 2017, 36(6): 7-10

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