Power-line interference suppression of MT data based on frequency domain sparse decomposition

作     者：TANG Jing-tian LI Guang ZHOU Cong LI Jin LIU Xiao-qiong ZHU Hui-jie 汤井田;李广;周聪;李晋;刘晓琼;朱会杰

作者机构：School of Geosciences and Info-PhysicsCentral South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment MonitoringMinistry of Education(Central South University)Changsha 410083China College of Information Science and EngineeringHunan Normal UniversityChangsha 410081China The First Engineering Scientific Research Institute of General Armaments DepartmentWuxi 214035China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2018年第25卷第9期

页      面：2150-2163页

核心收录：

学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：Project(2014AA06A602)supported by the National High-Tech Research and Development Program of China Projects(41404111,41304098)supported by the National Natural Science Foundation of China Project(2015JJ3088)supported by the Natural Science Foundation of Hunan Province,China 

主　　题：sparse representation magnetotelluric signal processing power-line noise improved orthogonal matching pursuit redundant dictionary 

摘      要：Power-line interference is one of the most common noises in magnetotelluric(MT)*** usually causes distortion at the fundamental frequency and its odd harmonics,and may also affect other frequency *** trap circuits are designed to suppress such noise in most of the modern acquisition devices,strong interferences are still found in MT data,and the power-line interference will fluctuate with the changing of load *** fixed trap circuits often fail to deal with *** paper proposes an alternative scheme for power-line interference removal based on frequency-domain sparse ***,the fast Fourier transform of the acquired MT signal is ***,a redundant dictionary is designed to match with the power-line interference which is insensitive to the useful ***-line interference is separated by using the dictionary and a signal reconstruction algorithm of compressive sensing called improved orthogonal matching pursuit(IOMP).Finally,the frequency domain data are switched back to the time domain by the inverse fast Fourier *** experiments and real data examples from Lu-Zong ore district illustrate that this scheme can effectively suppress the power-line interference and significantly improve data *** with time domain sparse decomposition,this scheme takes less time consumption and acquires better results.