A multi-magnetic target location detection method based on database feature matching
A magnetic target and feature matching technology, which is applied in database query, magnetic field measurement using the principle of magnetic flux control, magnetic gradient measurement, etc., can solve the problems of high noise sensitivity and strong dependence on the distribution of measuring points, and achieve a simple principle Effect
Active Publication Date: 2022-07-29
TIANJIN UNIV
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[0005] The purpose of the present invention is to provide a multi-magnetic target position detection method based on database feature matching for the problem of multi-magnetic target detection with known magnetic moments and unknown quantities. This method is simple in principle, efficient and accurate, and can make up for traditional magnetic beacons. Positioning inversion technology only needs to know the number of magnetic sources, and has the disadvantages of strong dependence on the distribution of measuring points and high noise sensitivity
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[0036] In order to further understand the content of the invention, features and effects of the present invention, the following examples are exemplified, and are described in detail as follows in conjunction with the accompanying drawings:
[0037] The present invention is a method for determining the position of multiple magnetic dipoles by establishing a database and performing multi-dimensional feature matching in the database by using the magnetic field eigenvalues at the measuring points. This method is mainly used to determine the number and position of multiple magnetic targets when their magnetic moment parameters are known and the same.
[0038] as attached figure 1 As shown, a multi-magnetic target position detection method based on database feature matching includes the following steps:
[0039] Step 1, establish a database: define the database establishment area according to the trajectory of the aircraft, and arrange the measuring points, and use the magnetic ...
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The invention discloses a multi-magnetic target position detection method based on database feature matching: (1) calculating the magnetic field vector and gradient tensor generated by random combination of all magnetic beacons at each measuring point position; (2) Construct the magnetic field vector index table and magnetic field gradient tensor index table; (3) The carrier measures the magnetic field vector and gradient tensor data on the track in real time; (4) Calculates the measured magnetic field vector matrix L according to the measured magnetic field vector and gradient tensor data 2 Norm values and measured magnetic field gradient tensor matrix L 2 Norm value; use the bisection method to directly perform matching, positioning and confirmation optimization in the magnetic field vector index table and the magnetic field gradient tensor index table to obtain the final magnetic beacon combination situation, and determine the magnetic beacon corresponding to the magnetic beacon combination situation. data and beacon location information. The invention can make up for the shortcomings of the traditional magnetic beacon positioning and inversion technology that only requires a known number of magnetic sources, has strong dependence on the distribution of measuring points, and is highly sensitive to noise.
Description
technical field [0001] The invention relates to magnetic target detection technology, in particular to a multi-magnetic target position detection method based on database feature matching. Background technique [0002] Magnetic target detection technology plays an important role in the fields of resource exploration, target detection and tracking, navigation and positioning, and medical engineering. However, there is a strong nonlinear relationship between the magnetic field characteristics generated by these targets and their own positions, which makes the position calculation based on the magnetic field characteristics high complexity. When there are multiple magnetic targets in the relevant area, their magnetic fields will be aliased together, and the problem is more complicated when the number of these magnetic targets is unknown. [0003] When the distance between the measuring point and the magnetic source is more than 2.5 times the maximum dimension of the magnetic s...
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IPC IPC(8): G06F16/24G01R33/022G01R33/02
CPCG06F16/24G01R33/022G01R33/02
Inventor 林叶常帅付晓梅
Owner TIANJIN UNIV