Geosystem Engineering

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Power line interference noise elimination method based on independent component analysis in wavelet domain for magnetotelluric signal

  • Cao, Xiaoling (Key Laboratory of Exploration Technologies for Oil and Gas Resources in Ministry of Education, Yangtze University) ;
  • Yan, Liangjun (Key Laboratory of Exploration Technologies for Oil and Gas Resources in Ministry of Education, Yangtze University)
  • Received : 2017.04.27
  • Accepted : 2017.10.15
  • Published : 2018.11.30
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Abstract

With the urbanization in recent years, the power line interference noise in electromagnetic signal is increasing day by day, and has gradually become an unavoidable component of noises in magnetotelluric signal detection. Therefore, a kind of power line interference noise elimination method based on independent component analysis in wavelet domain for magnetotelluric signal is put forward in this paper. The method first uses wavelet decomposition to change single-channel signal into multi-channel signal, and then takes advantage of blind source separation principle of independent component analysis to eliminate power line interference noise. There is no need to choose the layer number of wavelet decomposition and the wavelet base of wavelet decomposition according to the observed signal. On the treatment effect, it is better than the previous power line interference removal method based on independent component analysis. Through the de-noising processing to actual magnetotelluric measuring data, it is shown that this method makes both the apparent resistivity curve near 50 Hz and the phase curve near 50 Hz become smoother and steadier than before processing, i.e., it effectively eliminates the power line interference noise.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Yangtze University

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