基于Hilbert-Huang 变换的大地电磁去噪研究

doi:10.11720/wtyht.2021.0047

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Abstract

Near-field effects are liable to rise in magnetotelluric signals due to noise, which seriously affects the quality of the collected signals. The widely used remote reference method-Robust-still has some shortcomings in suppressing near-field interference. In this paper, after being verified using numerical simulation in terms of denoising effects, the Hilbert-Huang transform (HHT) was applied to a magnetotelluric signal with serious near-field interference, achieving remarkable effects. Meanwhile, the polarization distribution of the electric and magnetic fields was calculated using the distribution function of polarization directions. It was found that the distribution function was closer to a Gaussian distribution function, also verifying the effectiveness of the HHT in suppressing near-field interference.

Key words： HHT magnetotelluric cultural noise near-field interference error distribution function

Received: 26 January 2021 Published: 21 December 2021

ZTFLH:

P631

Corresponding Authors: YAN Liang-Jun E-mail: 201972168@yangtzeu.edu.cn;yljemlab@163.com

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	Jun CHEN
	Liang-Jun YAN
	Lei ZHOU

Cite this article:

Jun CHEN,Liang-Jun YAN,Lei ZHOU. Denoising of magnetotelluric data based on Hilbert-Huang transform[J]. Geophysical and Geochemical Exploration, 2021, 45(6): 1462-1468.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0047 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I6/1462

EMD process

Analog empirical mode decomposition

In the process of EMD decomposition with noise
a—the signal witn triangle wave; b~f—IMF1~IMF5; g—the residual signal

Compare the separated noise (b) with the actual noise (a)

Dead band apparent resistivity and phase curves corresponding to non denoised time series

Polarization direction response function without denoising

Hilbert time spectrum of IMF with more noise frequency content

Recalculated apparent resistivity and phase after denoising

Polarization direction response function after denoising

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