Harmonic Parameter Estimation Based on Classical Cosine Window Three Spectral Line Interpolation FFT

doi:10.13438/j.cnki.jdzk.2022.03.006

Abstract

Abstract: Aiming at the problems of spectrum leakage and fence effect in signal processing by fast Fourier transform（FFT）,based on the analysis of the characteristics of main-lobe and side-lobe of several classical cosine windows,a harmonic analysis method based on cosine window three spectral line interpolation FFT is proposed by using the spectral lines with the largest amplitude near the real frequency point and the spectral lines on both sides. Combined with the least square and polynomial fitting methods,the correction formula of harmonic parameters is derived.The simulation results show that,compared with the traditional FFT method,the proposed method can better suppress the influence of spectrum leakage and fence effect,and the detection accuracy of harmonic parameters has been further improved.

Key words: fast Fourier transform, cosine window, harmonic analysis, three spectral line interpolation

LI Minghao, WANG Xuming, ZHANG Zhiwei, TAN Yuhao, LEI Kejun. Harmonic Parameter Estimation Based on Classical Cosine Window Three Spectral Line Interpolation FFT[J]. Journal of Jishou University(Natural Sciences Edition), 2022, 43(3): 38-43.

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