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Audio magnetotelluric data noise interference filtering method and system

An audio magnetotelluric and noise interference technology, applied in the field of geophysical exploration, can solve the problem of data that cannot be filtered out of multiple types of noise interference at the same time

Active Publication Date: 2020-04-10
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

[0003] The purpose of the present invention is to provide a filtering method and system for audio frequency magnetotelluric data noise interference, which solves the problem that current filtering methods cannot simultaneously filter out data containing multiple types of noise interference

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  • Audio magnetotelluric data noise interference filtering method and system
  • Audio magnetotelluric data noise interference filtering method and system
  • Audio magnetotelluric data noise interference filtering method and system

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specific Embodiment approach

[0144] Adopt audio magnetotelluric denoising software (hereinafter referred to as "software") to open each signal track of the original time series signal of the file with TS4 as the suffix with a sampling rate of 150Hz, and the signal track includes the circuit signal and the magnetic track signal. Each signal track includes a track X direction (Ex), a track Y direction (Ey), a track X direction (Hx) and a track Y direction (Hy). After opening the file, the software has converted the binary data of the original time series signal into decimal data, and draws each signal channel in the decimal data on the software interface in the form of a curve.

[0145] Analyze the power spectrum curve of each open signal channel to judge whether there is low-frequency noise interference, and if there is no low-frequency noise interference, judge whether there is spike noise interference.

[0146] If there is low-frequency noise interference, the generalized morphological filtering method i...

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Abstract

The invention discloses an audio magnetotelluric data noise interference filtering method and an audio magnetotelluric data noise interference filtering system, which relate to the technical field ofgeophysical exploration. According to the audio magnetotelluric data noise interference filtering method, a generalized morphological filtering method is adopted to filter data with low-frequency noise interference, the data with peak pulse noise interference is filtered by adopting a wavelet transform method, low-frequency noise interference can be filtered out, peak pulse noise interference canbe filtered out, and various noise interferences can be filtered out at the same time, thus high-quality original data are obtained, the working efficiency is improved, the field workload is reduced,and geological prospecting work can be better served.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a filtering method and system for noise interference of audio frequency magnetotelluric data. Background technique [0002] When the audio magnetotelluric sounding method is working in the field, the electric field signal and the magnetic field signal on the measuring point are collected at the same time, and the frequency range of the collection is roughly 1 Hz to 10000 Hz. The signal frequency band collected by the audio magnetotelluric sounding method is very susceptible to strong interference conditions such as high-voltage power lines, ground free currents, mining areas, factories, and human activities. Moreover, with the advancement of science and technology, the expansion of human activities and the scope of geophysical exploration, the interference of this method has become more and more serious. In areas with strong interference, the quality of data meas...

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Application Information

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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 乔宝强程纪星刘祜张濡亮
Owner BEIJING RES INST OF URANIUM GEOLOGY
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