Suppression method for cross term interference in time-frequency spectrum of tunnel blasting vibration signal

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 59-65.

FU Xiaoqiang1,2,3, YU Jin2, DAI Liangyu3, QIN Shuangshuang1

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Abstract

Here, aiming at the difficulty problem of cross term interference existing in time-frequency spectrum of blasting vibration signal, the combination algorithm of matching pursuit (MP) and smooth pseudo-Wigner-Ville distribution (SPWVD) was adopted to suppress cross term in time-frequency spectrum and extract features of tunnel blasting vibration signal. According to the theory of signal sparse representation and matching pursuit, an overcomplete sparse atom library was constructed to match signal features. The atomic reconstruction of sub-signals was realized through matching pursuit decomposition, and the reconstructed sub-signals’ SPWVD distributions were calculated and superposed to obtain a more accurate time-frequency representation of blasting signal. The results showed that MP-SPWVD combination method can be used to weaken and suppress cross term interference in time-frequency spectrum of blasting vibration signal, improve the signal time-frequency recognition degree and its time-frequency feature analysis ability, and verify the accuracy and effectiveness of MP-SPWVD combination method in signal time-frequency analysis; MP-SPWVD combined algorithm is suitable for the time-frequency feature extraction of blasting vibration signal.

Key words

blasting vibration signal / time-frequency analysis / matching pursuit (MP) / smooth pseudo-Wigner-Ville distribution (SPWVD) / cross term suppression

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FU Xiaoqiang, YU Jin, DAI Liangyu, QIN Shuangshuang. Suppression method for cross term interference in time-frequency spectrum of tunnel blasting vibration signal[J]. Journal of Vibration and Shock, 2021, 40(19): 59-65

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