Iterative frequency estimation algorithm for harmonic real signals based on spectrum shifting

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 128-133.

MOU Zelong1, TU Yaqing1, CHEN Peng2, LIU Yan1

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Abstract

In order to suppress the influence of spectrum leakage of harmonic real signals, an iterative frequency estimation algorithm for harmonic real signals based on spectrum shifting was proposed.When estimating the frequency of a certain harmonic component, all other components with negative frequencies and positive ones were interference components to produce spectrum leakage.According to each interference component’s frequency, the spectrum shifting was done to suppress the interference component until a signal with a single component was obtained, its frequency was estimated with the parabolic interpolation algorithm.After frequencies of all harmonic components were obtained, suppressing interference components was performed again to update a single component signal for the purpose of estimating a more accurate frequency value.Simulation test results showed that the proposed algorithm can suppress interference components, and improve the frequency estimation accuracy of harmonic real signals; the mean square error of frequency estimation is closer to Cramer-Rao low bound (CRLB).

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frequency estimation / spectrum leakage / harmonic real signal / spectrum shifting

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MOU Zelong1, TU Yaqing1, CHEN Peng2, LIU Yan1. Iterative frequency estimation algorithm for harmonic real signals based on spectrum shifting[J]. Journal of Vibration and Shock, 2021, 40(11): 128-133

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