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A method for suppressing magnetotelluric noise based on inter-station transfer function

A transfer function, noise suppression technology, applied in the direction of electric/magnetic exploration, geophysical measurement, re-radiation of sound waves, etc.

Inactive Publication Date: 2019-02-05
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects of existing magnetotelluric denoising methods, the present invention provides a magnetotelluric noise suppression method based on inter-station impedance, which avoids the influence of local point-related noise on impedance estimation, suppresses flying spots, reduces errors, and improves magnetotelluric noise data quality

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  • A method for suppressing magnetotelluric noise based on inter-station transfer function
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  • A method for suppressing magnetotelluric noise based on inter-station transfer function

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0032] figure 1 It is a flow chart of a method for suppressing magnetotelluric noise based on inter-station impedance of the present invention, specifically processed according to the following steps:

[0033] 1) Synchronize the magnetotelluric time series data of multiple measuring points;

[0034] 2) Estimate the inter-station transfer function of the time series data after synchronization, including the transfer function of the horizontal electric field of the local measuring point and the horizontal magnetic field of the reference measuring point, and the transfer function of the horizontal magnetic field of the local measuring point and the magnetic field of the reference horizontal measuring point. Robust can be used to estimate the station If there is only one reference po...

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Abstract

The invention provides a magnetotelluric noise suppressing method based on an intersite transfer function. The method is used for removing noise by estimating the transfer function of electromagnetic fields among synchronous measuring points and synthesizing a time series signal of a local measuring point. The method comprises the following steps: (1) synchronizing multiple magnetotelluric measuring point time series data; (2) estimating the transfer function of intersite electromagnetic fields; (3) synthesizing the time series signal of the local measuring point via data of referred measuring points and the intersite transfer function; (4) identifying the position of noise at the local measuring point; and (5) replacing the noise with a synthesized signal, thereby obtaining new data after denoising. With the steps, the method can be used for effectively suppressing strong correlated noise, suppressing flying spots and reducing estimation errors.

Description

technical field [0001] The invention belongs to the field of data processing of magnetotelluric sounding methods, and relates to a method for suppressing magnetotelluric noise based on an inter-station transfer function. The method utilizes a plurality of synchronous magnetotelluric measuring points to process the transfer function relationship of electromagnetic fields between measuring points, The purpose of suppressing the noise of the magnetotelluric sounding data is achieved. Background technique [0002] Magnetotelluric sounding is a geophysical exploration method with natural field sources. It has the advantages of convenient field construction, large detection depth, and no high-resistivity layer shielding. In order to study scientific issues such as deep fluid distribution, plate tectonics, and continental dynamics, Provides important geophysical evidence. Natural electromagnetic field signals are weak in amplitude and wide in frequency, and are extremely susceptib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 王辉
Owner CHINA UNIV OF MINING & TECH (BEIJING)