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Practical magnetic gradient tensor high-precision single-point positioning method

A magnetic gradient tensor, single-point positioning technology, applied in the field of magnetic detection, can solve the problems of limited application range, poor positioning accuracy, poor practicability, etc., to achieve a wide range of applications, improve practicability, and suppress the influence of geomagnetic fields Effect

Pending Publication Date: 2021-02-12
THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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Problems solved by technology

[0022] The purpose of the present invention is to provide a practical magnetic gradient tensor high-precision single-point positioning method, which can solve the problem that the existing magnetic gradient tensor single-point positioning algorithm is greatly affected by the geomagnetic background field, poor positioning accuracy, poor practicability and limited application range. limit problem

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[0048] A practical magnetic gradient tensor high-precision single-point positioning method of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the following examples can only be used to explain the technical solutions of the present invention and cannot be construed as limiting the present invention.

[0049] Such as figure 2 As shown, a practical magnetic gradient tensor high-precision single-point positioning method of the present invention adopts eight three-component magnetometers to form a cube array to obtain the magnetic field vector value, and the labels of the eight three-component magnetometers are respectively 1 to 8, The labels of the upper four three-component magnetometers are 1-4, the labels of the lower four three-component magnetometers are 5-8, and the side length of the cube is d. The three-component magnetometer may be one of vector magnetic sensors such as a fluxgate sensor, a GM...

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Abstract

The invention relates to a practical magnetic gradient tensor high-precision single-point positioning method, wherein the method comprises the following steps: S100, measuring magnetic field vector values at eight vertexes of a cube through a cube array composed of eight three-component magnetometers; S200, obtaining magnetic gradient tensor matrixes G<m> on six surfaces of the cube through calculation, wherein m is equal to +x, -x, +y, -y, +z and -z; S300, calculating to obtain invariants m=+x, -x, +y, -y, +z and -z on each surface; S400, calculating to obtain the values of a, b and c, wherein a=abs(I1<+x> / I1<-x>), b=abs(I1<+y> / I1<-y>), and c=abs(I1<+z> / I1<-z>); and S500, judging the values of a, b and c, if any one of the values exceeds upper and lower limit thresholds, considering thatthe magnetic anomaly exists, and at the moment, adopting 12 positioning equations in the formula (12) to realize magnetic anomaly positioning through an optimization algorithm. According to the practical magnetic gradient tensor high-precision single-point positioning method, the invariants at the center points of the six faces of the cubic array serve as the basis for judging whether magnetic anomaly exists or not, and the practicability of the magnetic gradient tensor single-point positioning method is greatly improved.

Description

technical field [0001] The invention belongs to the field of magnetic detection, in particular to a practical magnetic gradient tensor high-precision single-point positioning method. Background technique [0002] As a new geophysical observation method, magnetic gradient tensor detection has gradually become a research hotspot in magnetic survey technology. It has many advantages that traditional magnetic total field and magnetic vector detection methods do not have. The amount of magnetic target body information is extremely rich, which can describe the characteristics of geological bodies more accurately. It has been applied to the identification and positioning of magnetic target bodies, such as in hidden geological body exploration, UXO detection, anti-submarine, etc., in military, environmental, Resource exploration and other aspects have broad application prospects (2008. Wu Zhaocai, Liu Tianyou. Magnetic gradient tensor measurement and application). The conventional ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/08G01V3/40
CPCG01C21/08G01V3/40
Inventor 李光钟华森修春晓周瑜
Owner THE THIRD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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