Method for measuring magnetic field noise coefficients of underwater vehicle based on small signal method

Abstract

The invention belongs to the field of engineering magnetic field modeling, and provides a method for measuring the magnetic field noise coefficients of an underwater vehicle based on a small signal method, and the method comprises: an UUV (Unmanned Underwater Vehicle) background magnetic field model is built; a magnetic field vector of UUV measuring environment is measured in advance; the placement direction of an UUV is changed, and corresponding Hx1, Hx2, Hx3 and Hx4 are measured through the changes of large-angle attitudes; the other conditions are not changed, a vertical direction magneticfield is applied to the UUV, and the rolling angle and the pitching angle are kept to be zero, the pointing orientation of the UUV is changed horizontally, and Hx5, Hx6, Hx7 and Hx8 are respectivelymeasured through the changes of the large-angle attitudes; a constant magnetic field, an induction magnetic field coefficient and a geomagnetic field are calculated, the above steps are repeated, andother parameters of the UUV magnetic field are calculated. According to the method, the correlation between the noise coefficients of the magnetic field and the multicollinearity of the model are effectively reduced, the influence on the energy spectrum of useful signals in the magnetic field is avoided, and the subsequent detection and identification of weak useful signals are facilitated.

Description

technical field [0001] The invention belongs to the field of engineering magnetic field modeling, and relates to a method for measuring the magnetic field noise coefficient of an underwater vehicle based on a small signal method, which is applied to the calculation of the magnetic field noise model of the underwater vehicle and the magnetic field noise compensation processing of the magnetic field sensor mounted on the underwater vehicle . Background technique [0002] The background magnetic field generated by unmanned underwater vehicle (UUV) is divided into constant magnetic field, induced magnetic field and eddy current magnetic field. The constant magnetic field is the magnetic field generated by the UUV's own ferromagnetic material; the UUV is in the geomagnetic field, and the UUV generates an induced magnetic field under the induction of the geomagnetic field; while the UUV moves in the geomagnetic field, cutting the magnetic field lines will generate an eddy current ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems and deficiencies in the magnetic field noise coefficient of the UUV magnetic field model by the traditional small signal method, and propose a method for measuring the magnetic field noise coefficient of an underwater vehicle based on the small signal method, which is easy to implement, simple to operate, and effectively reduces The correlation between the noise coefficients of the magnetic field and the multicollinearity of the model make the model coefficients obtained more accurate; it will not affect the energy spectrum of the useful signal in the magnetic field, which is conducive to the subsequent detection and identification of weak useful signals

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