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The method of frequency determination of impulse response components based on cross-correlation vs. fast Fourier transform

作     者:Kotowski, Adam 

作者机构:Faculty of Mechanical Engineering Department of Automatic Control and Robotics Bialystok University of Technology ul. Wiejska 45C Bialystok15-351 Poland 

出 版 物:《Diagnostyka》 (Diagnostyka)

年 卷 期:2016年第17卷第1期

页      面:59-64页

核心收录:

基  金:This work has been supported by Bialystok University of Technology under work No. S/WM/1/2016 

主  题:Impulse response 

摘      要:The paper presents results of impulse response spectral analysis that has been obtained using a method based on cross-correlation. The impulse response spectrum is achieved by correlating the impulse response and reference single-harmonic signals and using Hilbert transform to obtain an envelope of cross-correlation. Then, surface area under the envelope is calculating and its plot in frequency domain is making. The spectrum obtained this way has its advantage over the fast Fourier transform (FFT) that its spectral resolution does not depend on length of impulse response. At the same time, the spectral resolution can be much greater than spectral resolution resultant from FFT. Obtained results show that presented method gives possibilities to determine frequencies of impulse response components more accurate in comparison to FFT particularly for short-time impulse responses.

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