磁线圈对地磁场的物理模拟及对地磁导航研究的意义

利用磁线圈对地球基本磁场开展动态模拟,将地磁场随空间的变化转化为在实验室中随时间的变化,能够为地磁导航系统的匹配试验提供物理仿真的地磁场环境。本项研究依照虚拟仪器技术思路,对磁线圈、恒流电源、磁通门磁力仪(或Overhauser磁力仪)和工控机进行数字化连接,并采用LabVIEW编程进行驱动控制,通过自动调节线圈绕组中的电流大小来实现对磁场的物理模拟并进行实时监测,尝试组建了地磁场动态模拟系统,并分别开展了对地磁场总强度和三分量信号的动态模拟实验。模拟系统可以实现天然地磁场和人工编制两种动态信号的输出模拟,且拟合效果良好。地磁场动态模拟系统的初步建立为今后地磁匹配试验等研究提供了仿真磁场环境。

Physical simulation of geomagnetic field by use of magnetic coils and its significance to the research of geomagnetic navigation

The active simulation of the Earthls main magnetic field can transform the spatial variation of geomagnetic field into the temporal variation of magnetic field in the laboratory, which will provide a physical simulation of geomagnetic field for the geomagnetic matching test in the study of geomagnetic navigation. We have made a measurement system, named the active simulation system of geomagnetic field, by digitally connecting IPC （Industrial Personal Computer） with the constant current power supply, magnetic coils and fluxgate magnetome- ter（or Overhauser magnetometer）, according to the virtual instrument approach, in the re- search. Programs compiled by LabVIEW drive and control the whole simulation system, au- tomatically adjust the current in coil windings to completion the physical simulation of mag- netic field and do real-time monitoring. The total intensity and tricomponent signals were ac- tively simulated respectively by the simulation system, which can output and simulate two kinds of active signals： coming from natural geomagnetic field or man-made. The simulation results are well. The tentative foundation of the active simulation system of geomagnetic field will provide an emulational magnetic environment for research work such as geomagnet- ic matching test in the future.