受空间天气影响的地磁导航装置磁场干扰噪声研究

Study of Magnetic Field Interference Noise in Geomagnetic Navigation Devices Affected by Space Weather

地磁导航设备运行时会受到地磁波动的影响,导致精度下降、定位失准和轨迹偏离等问题。空间天气是引起地磁波动的主要原因。为了解决这一问题,通过分析近年来地磁风暴、地磁亚暴和地磁脉动的数据特征,构建了地磁干扰磁场数据库。并在磁屏蔽室内搭建干扰磁场发生装置,进而为地磁导航装置提供测试环境。测试结果表明:选用的sym4小波能够对磁暴等级在强烈(Dst>-250 nT)以下的复合磁场噪声起到明显的滤除效果;且干扰磁场发生装置能够很好地模拟出磁场噪声数据库中的干扰磁场信号特征,模拟偏差优于3%。

The operation of geomagnetic navigation equipment can be affected by geomagnetic fluctuations,resulting in reduced accuracy,inaccurate positioning and deviations in trajectory.Space weather is the main cause of geomagnetic fluctuations.In order to solve this problem,a geomagnetic disturbance field database was constructed by analyzing the data characteristics of geomagnetic storms,geomagnetic substorms and geomagnetic pulsations in recent years.The interfering magnetic field generation device is built in a magnetically shielded room to provide a test environment for geomagnetic navigation devices.The test results show that the selected sym4 wavelet can significantly filter out the composite magnetic field noise with the magnetic storm level below strong(Dst>-250 nT);and the interference magnetic field generation device can simulate the interference magnetic field signal characteristics in the magnetic field noise database well,with the simulation deviation better than 3%.