摘要
针对矿山微震信号降噪,提出了一种基于EEMD_Hankel_SVD(集合经验模态分解_Hankel矩阵_奇异值分解)的微震信号降噪方法。首先采用EEMD获得多层模态分量,计算各模态分量与原始信号的相关系数,剔除第一个相关系数差值局部最大值前的模态分量。对剩余各模态分量分别构建Hankel矩阵,再计算各Hankel矩阵的奇异值矩阵。根据奇异值曲线划分信号空间和噪声空间,实现剩余各模态分量的降噪,进而对降噪后的模态分量相加得到降噪信号。仿真试验表明该方法能有效保留信号的局部特征,提高了信噪比;矿山微震信号应用表明该方法有效地提高了STA/LTA,PAI-K和AIC法P波初至拾取效果;仿真试验和矿山微震信号P波拾取均表明该方法降噪效果优于小波重构、EMD重构和Hankel_SVD降噪,且该方法与AIC法结合拾取效果最佳。
To denoise microseismic noises, an EEMD_Hankel_SVD （ensemble empirical mode decomposition_Hankel matrix_signular value decomposition） combined method is proposed. Firstly,the EEMD is used to obtain mode func- tions, then the correlation coefficient between each mode function and original signal is calculated, and the mode func- tions before the first local maximum correlation coefficient difference are deleted. The rest mode functions are used to construct Hankel matrixes, and the SVD is applied to decompose the Hankel matrixes. The microseismic signal and noises are divided by the curve of singular values and this is used to denoise mode functions,then the denoised mode functions are combined to obtain denoised microseismic signal. The simulated tests show that the proposed method can retain local features well and increase signal to noise ratio （SNR）. The application to mine microseismic signals shows that the proposed method can effectively improve the P-phase picking results of the STA/LTA picker, PAI-K （ phase arrival identification-kurtosis） picker and AIC （Akaike information criterion） picker. In addition, both the simulated tests and mine microseismic signal picking results show that the denoising performance of this method is better than that of wavelet reconstruction, empirical mode decomposition （EMD） reconstruction, and Hankel_SVD denoising. Fur-thermore,the combination with the AIC picker obtains a best picking result.
作者
李伟
江晓林
陈海波
金珠鹏
刘志军
李兴伟
林井祥
LI Wei;JIANG Xiaolin;CHEN Haibo;JIN Zhupeng;LIU Zhijun;LI Xingwei;LIN Jmgxlang(College of Mining Engineering,Heilong]iang University of Science ＆ Technology,Harbin 150022,China;Key Laboratory of Mining Engineering of Hei long]iang Province Higher Education,Heilongjiang University of Science ＆ Technology,Harbin 150022,China;College of Electronics and lnfi~rmation En gineering,Heilong/iang University of Science ＆ Technology,Harbin 150022,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2018年第7期1910-1917,共8页
Journal of China Coal Society
基金
黑龙江省自然科学基金面上资助项目(E2016061
F2015019)
黑龙江省普通高等学校采矿工程重点实验室开放课题资助项目(2014KF04)
关键词
微震信号降噪
集合经验模态分解
HANKEL矩阵
奇异值分解
P波初至拾取
microseismic signal denoising
ensemble empirical mode decomposition （EEMD）
Hankel matrix
singularvalue decomposition （SVD）
P-phase arrival picking
