Method for positioning underwater magnetic target in high-precision and long-distance mode through total geomagnetic field

A technology of geomagnetic total field and positioning method, which is applied in the fields of re-radiation, electric/magnetic exploration, water resource assessment, etc., and can solve problems such as difficult vector measurement and complicated installation and use

Inactive Publication Date: 2014-07-16
HARBIN ENG UNIV
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Problems solved by technology

[0005] The geomagnetic field is a vector field. The implementation of vector measurement can describe and grasp the geomagnetic elements and geomagnetic information more comprehensively. However, it is difficult to realize vector measurement. First, a vector magnetic sensor must be used. At this stage, a three-axis fluxgate sensor is generally u

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  • Method for positioning underwater magnetic target in high-precision and long-distance mode through total geomagnetic field
  • Method for positioning underwater magnetic target in high-precision and long-distance mode through total geomagnetic field
  • Method for positioning underwater magnetic target in high-precision and long-distance mode through total geomagnetic field

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Specifically, the present invention uses a 2×2 magnetic positioning array to measure the total geomagnetic field data, and obtains the position coordinates of the target through strict physical concept deduction and algorithm design according to the far-field theory of the target magnetic dipole, so as to realize precise positioning. method, since the coordinates of the target position are calculated by using the magnetic difference value, the influence of the spatial distribution of the geomagnetic field and the influence of the change with time can be eliminated. It has important applications in underwater energy and mineral exploration, various underwater pipeline maintenance monitoring, geological disaster monitoring, underwater archaeology, shipwreck survey, mine clearance and anti-submarine and other fields.

[0024] The specific contents of the present in...

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Abstract

The invention relates to a method for positioning an underwater magnetic target in a high-precision and long-distance mode through a total geomagnetic field. The method includes the steps that a plane square array is formed by arraying four magnetic sensors on the water surface or under the water surface; a first sensor measurement value, a second sensor measurement value, a third sensor measurement value, a fourth sensor measurement value and the distance between each sensor and the target are collected; the orientation coordinates and target magnetic moment of the target are worked out; all time parameters are output, and target motion tracks are described. According to the method, target positioning is achieved by detecting the single scalar of the total geomagnetic field. Because the total geomagnetic field is measured, gesture and orientation correction is not needed for convenient installing and use of a magnetometer. Due to the adoption of a magnetic field difference algorithm, the influence of time variant of the total geomagnetic field and the influence of spatial environment magnetic field distribution on magnetic positioning can be excluded; by means of the positioning method, the positioning precision is high, and the measured distance is long.

Description

technical field [0001] The invention relates to a high-precision and long-distance positioning method for an underwater magnetic target by using the total geomagnetic field. Background technique [0002] Geomagnetism is an ancient subject. The study of the geomagnetic field can promote basic research in related fields such as the evolution of the universe, the evolution of the earth, the evolution of geological structures, and seismic activity. The results of geomagnetic research have extensive and important applications in the fields of navigation, aviation, aerospace, energy exploration and military affairs. [0003] Take minesweeping as an example. The sunken mines left over from World War II are attached to the seabed at a depth of 100 meters. The acoustic characteristics are similar to those of stones. It is difficult for sonar to effectively separate them from the environment. For sonar, it is almost like finding a needle in a haystack. The acoustic characteristics of...

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Application Information

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IPC IPC(8): G01V3/08
CPCY02A90/30
Inventor 康崇樊黎明万胜伟
Owner HARBIN ENG UNIV
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