摘要
为了实现高精度的地磁辅助导航,必须从磁场传感器的测量数据中补偿潜艇干扰磁场,分离出准确的地磁场。分析了潜艇干扰磁场的来源,针对最主要的磁化磁场进行研究。建立了潜艇磁化磁场的方程和边界条件,采用有限元软件ANSYS进行仿真计算和分析。仿真结果表明,在地磁场作用下,潜艇下方距轴线1.25倍艇身半径处,磁化磁场强度为104nT;距轴线20倍艇身半径处,磁化磁场已减弱至50nT左右。重点分析了潜艇下方距轴线1.5倍艇身半径处,磁化磁场的分布特性。分析表明,潜艇磁化场与地磁场之间存在线性转换关系;建立了线性转换矩阵,其中转换矩阵各元素只与空间点坐标、潜艇几何结构、材料特性有关。
The disturbed magnetic field must be compensated from measured data of magnetic sensors, and accurate geomagnetic field must be obtained in order to achieve geomagnetic navigation with high precision. Firstly, the disturbed magnetic fields are divided into four classes according to magnetic origins, and the stress is laid on magnetization field. Then, the Equations and boundary conditions are given, and the simulation is made with the software ANSYS. The simulations show that the magnetization field is approximately several 104 nT in the line which lies under submarine axes with the distance of 1.25 times of submarine-body radius, and decreases to 50 nT at the distance of 20 times the radius. Further analysis indicates that linear conversion relationship exists between magnetization field of submarine and geomagnetic field. In the end, the linear conversion matrix is founded whose elements are only determined by the coordination, the geometry and material properties of submarine.
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2009年第3期293-296,共4页
Journal of Chinese Inertial Technology
基金
国家863计划(2006AA12Z319)
关键词
地磁场
磁化磁场
有限元
线性转换
geomagnetic field
magnetization
finite element method
linear conversion
