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A Detection Method Based on Magnetic Gradient Tensor

A magnetic gradient tensor and detection method technology, applied in the field of magnetic detection, can solve the problems of limited detection accuracy, limited detection accuracy, unusability, etc., and achieve the effect of improving the magnetic detection accuracy

Active Publication Date: 2022-02-15
HARBIN INST OF TECH
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Problems solved by technology

[0011] The purpose of the present invention is to propose a detection method based on the magnetic gradient tensor, to solve the problem that SSM only compensates the direction error of the STAR method, and cannot be used in actual magnetic detection; LSM compensates both direction error and distance error, but The improved detection accuracy is very limited; WSM only compensates the direction error of the STAR method, which limits the further improvement of detection accuracy

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  • A Detection Method Based on Magnetic Gradient Tensor
  • A Detection Method Based on Magnetic Gradient Tensor
  • A Detection Method Based on Magnetic Gradient Tensor

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specific Embodiment

[0118] Let the magnetic target be on a circular trajectory T parallel to the x-y plane 1 exercise, such as image 3 shown. on track T 1 Among them, height h=0.25m, radius R=0.433m. The magnitude of the geomagnetic field is 55000nT, the geomagnetic declination is -10°, and the geomagnetic inclination is 60°. Detection distance r, magnetic moment vector The values ​​of baseline distance D, sensor resolution S, and standard deviation σ of Gaussian white noise are shown in Table 1. In this working condition, the calibration error of the tensor gradiometer is not considered first.

[0119]

[0120] Table 1 Simulation conditions

[0121] Because the magnetic moment vector is calculated from the position vector, the detection error is measured by the positioning error δ.

[0122]

[0123] where x t 、y t ,z t are the real values ​​of the coordinates of the magnetic target in the x, y, and z directions, and x c 、y c ,z c are the calculated values ​​of the coordinate...

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Abstract

The present invention proposes a detection method based on the magnetic gradient tensor, and the detection method includes the following steps: step 1, first calculate the initial value of the position vector and the magnetic moment vector by using the STAR method; step 2, then calculate the new magnetic gradient contraction Gradient, and calculate the new position vector and magnetic moment vector; step 3, repeat step 2 until the difference between the two position vectors meets the convergence condition or the number of iterations reaches the limit. The invention reveals the mechanism of aspheric surface error generation, proposes magnetic gradient shrinkage without aspheric surface coefficient, and uses iterative method to propose ISM to eliminate aspheric surface error; ISM reduces the average positioning error of STAR method, LSM, and WSM respectively 94.6%, 40.4%, 38.0%, further improving the magnetic detection accuracy of the three magnetic detection methods.

Description

technical field [0001] The invention relates to a detection method based on magnetic gradient tensor, which belongs to the technical field of magnetic detection. Background technique [0002] Magnetic detection can detect non-cooperative magnetic targets in real time, and is a research hotspot in many fields. In the field of military engineering, it can be used to detect underwater submarines, unexploded ordnance (UXO), magnetic obstacles, etc. In the field of medical research, it can be used for wireless capsule tracking, detection of targeted cancer cells, tongue tracking, etc. In the field of geophysics, it can be used for mineral exploration, cave mapping, geomagnetic field evolution, etc. [0003] Magnetic detection method is the core research content of magnetic detection, and the improvement of magnetic detection method is an important means to improve the accuracy of magnetic detection. Because the magnetic gradient tensor contains rich magnetic field information,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08G01R33/022
CPCG01V3/08G01R33/022
Inventor 潘东华林生鑫靳崇渝金银锡葛宇航李立毅
Owner HARBIN INST OF TECH