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A method, device and terminal equipment for suppressing geomagnetic near-field noise interference

A technology of noise interference and geomagnetism, applied in measurement devices, electric/magnetic exploration, and re-radiation of sound waves, etc., can solve the problems of affecting the accuracy of electromagnetic exploration and the difficulty of signal extraction such as geomagnetic pulsation, etc. Effect

Active Publication Date: 2020-07-31
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiments of the present invention provide a method, device and terminal equipment for suppressing geomagnetic near-field noise interference, so as to solve the difficulty in extracting signals such as geomagnetic pulsation due to the existence of near-field noise interference, and the indirect influence The accuracy of the corresponding electromagnetic prospecting

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  • A method, device and terminal equipment for suppressing geomagnetic near-field noise interference
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  • A method, device and terminal equipment for suppressing geomagnetic near-field noise interference

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Embodiment 1

[0053] Please refer to figure 1 , figure 1 The implementation flow of a method for suppressing geomagnetic near-field noise interference provided by an embodiment of the present invention is shown, and the details are as follows:

[0054] In step S101, from the geomagnetic observation signals recorded by k geomagnetic observation stations, k sets of geomagnetic observation signals of the same period are intercepted, and the k geomagnetic observation stations include a geomagnetic observation station as a reference station , the k is a positive integer greater than 1.

[0055] In the embodiment of the present invention, the k geomagnetic observation stations in step S101 are specifically geomagnetic observation stations distributed in different geographical locations, and one and only one of them is a geomagnetic observation station as a reference station, which serves as a reference The geomagnetic observation station of the station is a geomagnetic observation station that ...

Embodiment 2

[0109] This embodiment is a simulation experiment of the method of the present invention carried out on the MATLAB platform.

[0110] Step 1: According to actual observations, geomagnetic field data usually contain two types of field sources: the first is the far-field space signal, which originates from the ionosphere and magnetosphere, and the signal has good consistency in a large spatial range; the second One is near-field human interference, that is, near-field noise interference, the most common of which is interference from trams, high-speed rail, and subways, which is a localized signal. Here, constructed as Figure 4 Two simulated source signals are shown, where Figure 4 (a) represents the amplitude modulated sine wave signal with a period of 20 seconds; 4(b) represents the simulated geomagnetic continuity pulsation Pc3, which represents the simulated noise-free geomagnetic observation signal and the square wave signal with a period of 19 seconds, simulating the tra...

Embodiment 3

[0120]In this embodiment, the geomagnetic observation signals of three geomagnetic observatories (FDG, KYS, UCU) and an international reference station (KAK) laid out in the Chiba area of ​​Japan are used as the processing object (sampling rate 1s) of the present invention, and the above four geomagnetic The relative geographical location of the stations is as Figure 10 As shown in , the black and white lines near the geomagnetic stations are tram tracks. The method for suppressing geomagnetic near-field noise interference provided in Embodiment 1 includes the following steps:

[0121] Step 1: Choose to intercept the geomagnetic observation data recorded by the three-component fluxgate magnetometer at the same period recorded by four geomagnetic stations including FDG, KYS, UCU geomagnetic station and the international reference station KAK ( seconds value, X component), such as Figure 11 As shown, among them, Figure 11 (a) to Figure 11 (d) represent the observation si...

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Abstract

The invention is applicable to the technical field of geomagnetic interference, and provides a method, device and terminal equipment for inhibiting geomagnetic near-field noise interference, comprising: intercepting k groups of geomagnetic observation signals in the same time interval from geomagnetic observation signals recorded by k geomagnetic observation stations (one of which is a geomagneticreference station); separating k groups of preprocessed geomagnetic observation signals based on an independent component analysis algorithm of blind source separation to obtain k separation signalsand a separation matrix, and identifying near-field noise interference signals in the k separation signals and setting the near-field noise interference signals to be zero; and reconstructing geomagnetic observation signals according to the obtained separation matrix and the k separation signals subjected to zero setting to obtain k groups of geomagnetic observation signals after the near-field noise interference is suppressed. Because the reference station data provides prior information in the blind source separation process and provides effective reference in the noise identification process, the near-field noise interference in the geomagnetic observation signals can be suppressed, and the geomagnetic exploration accuracy is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of geomagnetic interference, and in particular relates to a method, device and terminal equipment for suppressing geomagnetic near-field noise interference. Background technique [0002] The earth's magnetic field is the inherent magnetic field of the earth, which is generally divided into exogenous magnetic field, endogenous magnetic field and local induced magnetic field. At present, the geomagnetic observation stations established around the world can observe the changing magnetic field accounting for about 1% of the total geomagnetic field. Although only a small part of the earth's magnetic field can be observed, these basic observation data contain a wealth of geophysical information, such as the earth's magnetosphere, ionosphere, and stratigraphic structure, and may even contain precursor information about earthquake breeding and occurrence. Based on this, the observed geomagnetic signals can be direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08
CPCG01V3/081
Inventor 韩鹏周媛媛何展翔
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA