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

Journal of Central South University 2018年第9期25卷 2150-2163页

作者： TANG Jing-tian LI Guang ZHOU Cong LI Jin LIU Xiao-qiong ZHU Hui-jie School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education(Central South University)Changsha 410083China College of Information Science and Engineering Hunan Normal UniversityChangsha 410081China The First Engineering Scientific Research Institute of General Armaments Department Wuxi 214035China

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.

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

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