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Environment magnetic compensation method for distributed magnetic anomaly detection system

A detection system and distributed technology, which is applied in the field of magnetic field signal compensation, can solve the problems of complex changing rules of magnetic interference and the influence of distributed magnetic detection measurement results, and achieve the effects of improving detection ability, compensating for environmental magnetic field interference, and reducing the impact

Active Publication Date: 2018-05-25
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

The change law of environmental magnetic interference is complex, and the frequency band covers the frequency band of submarine magnetic anomaly signals, which has a great impact on the measurement results of distributed magnetic detection

Method used

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  • Environment magnetic compensation method for distributed magnetic anomaly detection system
  • Environment magnetic compensation method for distributed magnetic anomaly detection system
  • Environment magnetic compensation method for distributed magnetic anomaly detection system

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Embodiment Construction

[0040] The present invention will be further described below by means of the accompanying drawings and specific embodiments.

[0041] Such as figure 1 As shown, the principle of the present invention is to first preprocess the magnetic field data, including main magnetic field and crustal magnetic field compensation, linear trend compensation and low-pass filter processing.

[0042] figure 2 is the magnetic field change curve after preprocessing; then the correlation analysis is carried out on the two sets of preprocessing magnetic field data, image 3 is the correlation function curve; use the cross-correlation spectrum and autocorrelation spectrum to calculate the transfer function between the two sets of magnetic field data; calculate the environmental disturbance magnetic field by Fourier inverse transform and eliminate it from the original data, Figure 4 Comparing the schematic diagrams for the compensation results, it can be seen from the figure that compared with th...

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Abstract

The invention belongs to a geomagnetic field signal compensation technology, and specifically discloses an environment magnetic compensation method for a distributed magnetic anomaly detection system.The environment magnetic compensation method comprises the steps of performing preprocessing on magnetic field data, wherein the preprocessing comprises main magnetic field compensation, crust magnetic field compensation, linear trend compensation and low-pass filtering processing, then performing correlation analysis, calculating a transfer function between two groups of magnetic field data by using a cross-correlation spectrum and an autocorrelation spectrum, calculating the environment interference magnetic field intensity through Fourier transform, and performing effective compensation onthe obtained environment interference magnetic field intensity to acquire a submarine magnetic anomaly signal. According to the invention, real-time analysis, processing and compensation for environment magnetic interference signals are realized, influences imposed on submarine detection and recognition by the environment interference magnetic field are reduced, and the detection ability of the distributed magnetic detection system is improved.

Description

technical field [0001] The invention belongs to the field of geomagnetic field signal compensation technology, and in particular relates to a processing method for magnetic field detection signals in a distributed magnetic anomaly detection system. Background technique [0002] The geomagnetic field generally changes slowly and regularly with time and space. When there is a magnetic substance, the magnetic field of the substance itself and the magnetic field induced by the geomagnetic field will be superimposed on the geomagnetic field, so that the geomagnetic field in a certain area An exception occurred within. There are a large number of metal minerals in the land and ocean of the earth. Underwater military equipment such as submarines and mines are mainly composed of metal materials, and the magnetic materials in them will cause abnormalities in the surrounding geomagnetic field. The magnetic anomaly detection system realizes the detection and positioning of magnetic su...

Claims

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Application Information

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IPC IPC(8): G01V3/38G01V3/40
CPCG01V3/38G01V3/40
Inventor 秦杰王同雷王春娥魏晓虹韩文法尚克军
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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