基于磁矩分解的运动舰船磁场模型研究

Research on Magnetic Field Model of Moving Ship Based on Magnetic Moment Decomposition

摘要:

当前的舰船磁场模型大都是通过其静态特性而构建的，现实适用性较差。围绕运动舰船磁场不同航向、不同航区的适应性模型展开研究。首先分析了舰船磁场建模的等效源方法，接着研究了运动舰船磁场磁矩分解的原理与方法。主要思路是先测量舰船在东、西、南、北 4 个航向上的舰船下方 1 个平面的磁场三分量数据，将这 4 组数据分别作为同一舰船在不同磁化状态下的边界条件，求解出舰船在东、西、南、北 4 种不同磁化状态下的磁矩参数，最后联合求解磁源的固定磁矩和感磁磁矩参数。通过以上过程便可计算出舰船在任意航向、任意航行地点的磁矩，利用磁矩解算磁场得到运动舰船磁场模型。

关键词:等效源;感应磁场;4 航向;多航区

Abstract:

Most of the current ship magnetic field model is constructed through its static characteristics，and the practical applicability is poor. This paper focuses on different headings and navigation areas’ adaptive model of moving ship’s magnetic field. Firstly，the equivalent source method of ship magnetic field modeling is analyzed. Then the principle and method of magnetic field’s magnetic moment decomposition of moving ship are studied. The main idea is to measure the three-component data of a magnetic field in a plane under the ship in the east， west，south and north headings，the 4 sets of data are separately used as the boundary condition of the same ship under different magnetization states to solve the magnetic moments of the ship in 4 different magnetization states. Finally the fixed magnetic moment and inducted magnetic moment parameters of the magnetic source are jointly solved. Through the above process，the magnetic moment of the ship in any heading and any sailing position can be calculated，and the magnetic moment is used to solve the magnetic field to obtain the magnetic field model of moving ship.

Key words:equivalent source;induced magnetic field;4-heading;multi-navigation area