Submarine locating method based on spatial gradient of magnetic field at two detection locations

Abstract

The invention proposes a submarine locating method based on the spatial gradient of a magnetic field at two detection locations, and belongs to the fields of long-range submarine detection and magnetic dipole locating. The method includes the steps of first, forming a magnetic anomaly detection array using a plurality of single-axis vector magnetometers; measuring, by using the magnetic anomaly detection array, the magnetic field respectively at an initial detection location and a second detection location reached through a preset path, and obtaining a gradient tensor matrix and all the independent components thereof of a submarine additional magnetic field at each of the two detection locations; and according to an expression of the gradient tensor of the submarine additional magnetic field, substituting all the independent components of the gradient tensor matrix of the submarine additional magnetic field at each of the two detection locations to obtain and solve a locating equation, finally obtaining location information of the submarine and completing locating. The method can locate the submarine remotely in the background of a changing geomagnetic field, avoids the influence of diurnal variation in the geomagnetic field, and has high locating accuracy.

Description

technical field [0001] The invention relates to the fields of long-distance submarine detection and magnetic dipole positioning, in particular to a submarine positioning method based on magnetic field space gradients at two detection positions. Background technique [0002] As one of the most advantageous offensive combat weapon systems in the world today, submarines have great military value. Because of its concealment, submarines can carry out military operations such as reconnaissance, intelligence gathering, mine placement, strike or long-term strategic deterrence in a large underwater area for a long time. Therefore, it is particularly important to study the technology of detecting and locating the position of the submarine underwater. [0003] In the existing submarine detection technology, the principle of magnetic anomaly detection technology is that the steel structure of the submarine shell is magnetized by the geomagnetic field to generate an additional magnetic ...

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Problems solved by technology

However, the geomagnetic field will have a diurnal variation of up to 100pT due to the activities of the sun and the earth, so the amplitude of the geomagnetic field cannot be obtained in advance, and it is impossible to accurately obtain the additional magnetic field value of the submarine at the detection site under the background of the geomagnetic field

Therefore, the above magnetic dipole positioning method can only be applied to the situation where there is no background magnetic field or the background magnetic field is constant, and cannot be directly applied to the actual submarine positioning

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