A modified frequency spectrum correction method based on the phase difference correction method

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (1) : 162-166.

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A modified frequency spectrum correction method based on the phase difference correction method

HU Wen-biao; XIA Li; XIANG Dong-yang; WU Zheng-guo

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Abstract

Amplitude correction can not void dependence of the spectrum functions of window functions, when the phase difference correction method is employed to correct frequency spectrums. However certain window functions are very complex actually and the analytic expression of their spectrum function can’t be obtained. This paper proposed a novel amplitude correction method. After frequency correcting value is calculated based on the phase difference correction method, a new numerical sequence can be obtained by multiply the primary sequence and a plural sequence which is produced by the frequency correcting value. Then signal frequency of the new plural sequence aims at a certain spectral line, and frequency spectral analysis doesn’t produce the leak of the frequency spectrum. So the amplitude correction doesn’t depend on the spectral functions of window functions. Computer simulation results and the application example demonstrate that we can achieve the ideal correction precision even if in the dense distribution frequency spectrum by using the method which this paper proposed and choosing the appropriate window function.

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spectrum analysis / correction / phase difference / window function

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HU Wen-biao;XIA Li;XIANG Dong-yang;WU Zheng-guo. A modified frequency spectrum correction method based on the phase difference correction method[J]. Journal of Vibration and Shock, 2012, 31(1): 162-166