从潜艇磁测数据中分离地磁场的研究

Study on Abstracting Geomagnetic Field from Magnetic Field of Submarine

传感器实测数据中提取出真实的地磁场成分是水下地磁导航研究的一个难点。采用有限元计算软件ANSYS进行了仿真研究。分别研究了X、Y、Z磁场激励下,潜艇磁化磁场特性;绘出了潜艇某截面上的磁场分布,给出沿某曲线的磁场分布;发现激励磁场与潜艇磁场之间满足线性关系并给出线性转换系数沿某直线的分布状况;还研究了任意方向磁场激励下,得到激励磁场与潜艇磁场之间的线性转换矩阵,初步解决了从测量数据中提取地磁场的问题。

To abstract accurate geomagnetic field from data measured by magnetic sensors is one of the most difficult issue in automatic navigation for underwater vehicles. In the paper, finite element method is applied with ANSYS software and magnetic field of submarine is discussed under the promptings of outside magnetic field in X,Y and Z direction separately. The magnetic field distribution of submarine＇s section and curve are painted. The relationship between environmental field and magnetic field of submarine is linear. Then the linear conversion coefficient in some curves is discussed and given. At last the paper gives the computing formula for magnetic field of submarine under the promptings of arbitrary magnetic field. The problem of abstracting geomagnetic field is initially solved in this paper.