文献类型：期刊文献

英文题名：TSP wavefield separation and noise suppression based on the LC-KL-DSW method

作者：Yue, Yonggao[1];Han, Chun[2];Cui, Yinghao[1];Liu, Jialin[1];Chen, Yongqian[1];Zhang, Kai[1];Deng, Lijuan[1];Li, Zhengfeng[1];Xu, Hang[1];Niu, Jigao[1]

第一作者：Yue, Yonggao

通讯作者：Yue, YG[1]

机构：[1]Zhongyuan Univ Technol, Sch Mech & Elect Engn, Zhengzhou 450007, Henan, Peoples R China;[2]Xinxiang Univ, Coll Civil Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Zhongyuan Univ Technol, Sch Mech & Elect Engn, Zhengzhou 450007, Henan, Peoples R China

通讯机构：[1]corresponding author), Zhongyuan Univ Technol, Sch Mech & Elect Engn, Zhengzhou 450007, Henan, Peoples R China.

年份：2022

卷号：197

外文期刊名：JOURNAL OF APPLIED GEOPHYSICS

收录：;EI(收录号：20220511567336);Scopus(收录号：2-s2.0-85123720985);WOS:【SCI-EXPANDED(收录号:WOS:000788103400003)】；

基金：Acknowledgements The work was supported by the Scientific and technological project in Henan Province (212102310382, 202102210068) , and the Key sci-entific research projects of colleges and universities in Henan Province (22A410005, 21A460036) . We thank Professor Tao Jiang for her helpful comments to improve this work.

语种：英文

外文关键词：Local correlation (LC); Directional seismic waves (DSW); Karhunen-Loeve (KL) transform; Wavefield separation; Noise suppression

摘要：A complex seismic wavefield and strong random noise are the main factors that affect the detection distance and precision of tunnel seismic prediction (TSP). Considering that the Karhunen-Loeve (KL) and directional seismic wave (DSW) methods have the ability to extract the target signals and suppress random noise, we attempt to apply these methods to solve the problem of weak effective signals being difficult to separate in a complex wavefield. The local correlation (LC) algorithm can not only improve the accuracy of delay time estimation but also reduce the intensity of coherent interference. In this study, a KL-DSW method based on LC (LC-KL-DSW) is proposed for wavefield separation and noise suppression. First, the time window of the target signal is selected, and the cross-correlation method is used to estimate the time delay parameters of the target signal. Then, the event of the target signal is levelled by the time delay correction, and the signal is stacked in phase by an N-element array. Finally, the KL transform is used to extract the target signal, which can be obtained by anti-delay correction. Numerical simulations show that the complex seismic wavefields are separated well and that the signal-to-noise ratio (SNR) of the target signal is increased by approximately k (20 < k < 100) times via the N-element LC-KL-DSW technique. Under ideal conditions, only spherical diffusion attenuation is considered, and the detection distance increases by approximately root k-fold. Hence, the LC-KL-DSW technique has great significance for high accuracy and long-distance advanced tunnel detection.