Noise Suppression Method of Microseismic Signal Based on Complementary Ensemble Empirical Mode Decomposition and Wavelet Packet Threshold
| Autor: | Xiao-Ying Liu, Ling-Qun Zuo, Qi-Chao Mao, Rui-Sheng Jia, Hong-Mei Sun |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
General Computer Science
Computer science Noise (signal processing) wavelet packet threshold General Engineering Wavelet transform 020206 networking & telecommunications 02 engineering and technology White noise Signal Hilbert–Huang transform self-correlation Wavelet packet decomposition Wavelet Complementary ensemble empirical mode decomposition 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing General Materials Science noise suppression lcsh:Electrical engineering. Electronics. Nuclear engineering Algorithm lcsh:TK1-9971 Energy (signal processing) |
| Zdroj: | IEEE Access, Vol 7, Pp 176504-176513 (2019) |
| ISSN: | 2169-3536 |
| Popis: | Aiming at the situation that complementary ensemble empirical mode decomposition (CEEMD) noise suppression method may produce redundant noise and wavelet transform easily loses high-frequency detail information, considering wavelet packet transform can be used to perform better time-frequency localization analysis on signals containing a large amount of medium and high frequency information, according to the noise and useful signal components of both the characteristic of self-correlation function is different, the CEEMD and wavelet packet threshold jointed method is proposed. The method uses the energy concentration ratio to find noise and useful signal component demarcation point to denoise the microseismic signals. Firstly, we utilize adaptively decompose the signal from high frequency to low frequency by the CEEMD; Secondly, using the self-correlation method to select the intrinsic mode function (IMF) that needs noise suppression, the wavelet suppression method is used to suppress the noise of several high-frequency components whose self-correlation coefficient is below the critical value K; Finally, the IMF component after the wavelet packet threshold noise suppression is reconstructed with the noise-free IMF component. In order to verify the effectiveness of the proposed method on the noise suppression of microseismic signal, we added a Gaussian white noise to the Ricker wavelet signal similar to the microseismic signal. The experimental results show that the signal-to-noise ratio (SNR) of the signal is raised more than 10dB. The energy percentage is higher than 92%. In practical engineering, our proposal achieves an effective noise suppression effect on the microseismic signal. |
| Databáze: | OpenAIRE |
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