Magnetic target positioning method based on magnetic gradient tensor invariant

Abstract

The invention belongs to the technical field of magnetic detection, and relates to a novel magnetic target positioning algorithm. The algorithm can can solve a magnetic target of a unique position ina geomagnetic environment by deducing a perpendicular relationship obtained by using a magnetic gradient tensor invariant, and has the characteristic of being not affected by posture change. Firstly,the gradient tensors of three known positions are solved in a magnetic target magnetic field. Then, feature vectors corresponding to feature values with the minimal gradient tensor matrix absolute values of the three points are separately solved. At last, equations are separately built at the three measurement points by using the perpendicular relationship between the position vectors between themeasurement points and the magnetic target and feature vector vertical relations corresponding to the feature values with the minimal absolute values. By using vector operation, all the position vectors of the three points and the magnetic target can be expressed as the position vector of an original point and the magnetic target. The position of the magnetic target is acquired through solving. According to the method provided by the invention, only the magnetic gradient tensors of three positions need to be measured, so that the method is simple in solving process, fast in solving speed and convenient to implement.

Description

technical field [0001] The invention belongs to the technical field of magnetic detection and relates to a novel magnetic target positioning algorithm. The algorithm uses the magnetic gradient tensor invariant to deduce that it can uniquely solve the position of the magnetic target in the geomagnetic environment, and has the characteristic that it is not changed by the attitude change. Background technique [0002] Due to the existence of the geomagnetic field, objects containing ferromagnetic materials are magnetized, thereby showing magnetic characteristics and generating a magnetic field. Such a magnetic field superimposed on the geomagnetic field will cause geomagnetic field distortion. This phenomenon is called magnetic anomaly. Magnetic detection technology uses this phenomenon to locate and identify magnetic targets by observing and analyzing abnormal magnetic fields. Magnetic detection technology has extremely high military significance and civilian value due to its...

AI Technical Summary

Problems solved by technology

The magnetic gradient tensor positioning method can achieve precise positioning of the target, but it has high requirements for the movement of the carrying platform, and the maneuvering of the platform will greatly interfere with the positioning results

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