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Target positioning and recognition method

An identification method and target positioning technology, which are applied in the application fields of magnetic anomaly target positioning and identification, vector sensor positioning and magnetic anomaly object detection, and can solve the problem that the convergence speed and convergence are yet to be verified, and the signal-to-noise ratio is difficult to reach 46dB. and other problems, to achieve the effect of reducing detection requirements, high precision, and small amount of calculation.

Inactive Publication Date: 2018-06-29
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

In practical applications, even with a well-calibrated magnetometer array, the actual SNR is difficult to reach 46dB due to the existence of residual errors
Therefore, for the actual magnetic anomaly signal, the convergence speed and convergence of the algorithm need to be verified

Method used

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  • Target positioning and recognition method

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Embodiment Construction

[0057] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0058] The basic idea of ​​the present invention is: firstly, analyze the main source of the error of the angle and distance measurement algorithm, find the analytical expression of the error, and find the relevant algorithm to correct the error.

[0059] The technical solution of the embodiment of the present invention is:

[0060] First, the basic principle of the angle and distance measurement algorithm is given. In order to estimate the position information and magnetic moment information of the target, a cubic magnetometer array is designed. See figure 2 As shown, the magnetometer is placed at the 8 vertices of the cube structure. The magnetic anomaly signal generated by the magnetic target is as follows:

[0061]

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Abstract

The invention provides a target positioning and recognition method. The positioning and recognition method includes the following steps that: magnetic anomaly signals are acquired, the distance and unit position vector of a target are calculated through using a magnetic gradient tensor angle and distance measurement algorithm, and a position vector is calculated; the distance and unit position vector are substituted into the magnetic gradient tensor matrix of the target, and a magnetic moment vector is calculated; a correction coefficient g and included angle cosine cosphi are calculated according to the position vector and the magnetic moment vector, and a coefficient Q1 and a coefficient Q2 are calculated; and a new unit position vector is outputted under a convergence condition. The method provided by the invention has the advantages of high positioning accuracy, accurate magnetic moment estimation and long detection distance.

Description

Technical field [0001] The invention relates to the technical field of magnetic anomaly measurement, in particular to a method for positioning and identifying a magnetic anomaly target, and also relates to the application of the positioning method in vector sensor positioning and magnetic anomaly target detection. Background technique [0002] Ferromagnetic objects will produce magnetic anomaly signals under the action of the geomagnetic field. The magnetic anomaly target is generally equivalent to a magnetic dipole. Using the generated magnetic anomaly signals to retrieve the target's position, magnetic moment and other information has a wide range of applications, such as underwater magnetic target tracking, unexploded object detection, archaeology, etc. Under normal circumstances, the strength of the earth's magnetic field is much greater than the magnetic anomaly signal, so the magnetic anomaly signal cannot be directly measured with a magnetometer. The magnetic gradiometer...

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Application Information

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IPC IPC(8): G01V3/08
CPCG01V3/081
Inventor 张晓娟王辰
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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