Interpolation iterative frequency estimator based on all-phase spectral analysis for multi-frequency signals

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (1) : 89-95.

HUANG Xiangdong 1 LI Mingshi 1 LUO Peng 2 MA Xin 1

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Abstract

To accurately estimate the frequency components of a multiple-frequency signal, an all-phase spectral analysis-based interpolation iterative frequency estimator was proposed.Firstly, the all-phase spectral analysis was used to replace the FFT spectral analysis in this new estimator to reduce inter-spectral component interferences.Secondly, the frequency offset estimation mechanism was explored near the peak position of all-phase discrete time Fourier transformation (apDTFT) spectra.Thirdly, based on this mechanism, the corresponding interpolation and interative measures were designed to improve the accuracy of the proposed estimator.Both simulation results and actual data analysis showed that with the same number of multi-frequency signal observation samples, the proposed estimator has a higher estimation accuracy compared to Tsui estimator, so it is more valuable in application.

Key words

multiple-component signal / inter-component interference / apDTFT / interpolation iterative estimator

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HUANG Xiangdong 1 LI Mingshi 1 LUO Peng 2 MA Xin 1. Interpolation iterative frequency estimator based on all-phase spectral analysis for multi-frequency signals[J]. Journal of Vibration and Shock, 2019, 38(1): 89-95

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