一种利用剩磁标定的星光/磁测备份自主导航方法

针对空间机动平台GNSS导航系统易受干扰的缺陷,提出一种基于剩磁标定的磁测/星光备份的自主导航方案。当GNSS信号完好时，利用GNSS高精度测量信息和磁强计/星敏带剩磁干扰的联合测量信息不仅可实时估计出机动平台导航参数，同时准确标定出运行环境的剩余磁场强度；当GNSS信号受干扰中断时，在剩磁准确标定的基础上启用磁场/星光备份自主导航方案完成机动平台的导航参数实时估计。由仿真结果可知，当GNSS信号正常时该导航方案具备较高的剩磁标定精度，三轴标定误差为0.026nT，0.293nT，0.107nT；而当GNSS信号受干扰时，备份导航方案三轴位置估计误差为87.3m，172.5m，65.2m，三轴速度估计误差为0.78m/s，0.86m/s， 1.04m/s。 仿真结果表明该方案具备较强的可行性。

One Backup Navigation Scheme Based on Magnetic/Starlight Measurement with Remanence Calibration

One backup autonomous navigation based on magnetic/starlight measurement with remanence calibration is put forward in the light of defect of GNSS navigation system used in space mobile carrier.High accuracy GNSS and joint measurement information of gaussmeter/star sensor can be used to real- time estimate navigation parameters of space mobile carriers when GNSS signal is available. Simultaneously, geomagnetic remanence of operating enviroment is calibrated accurately. With accurate remanence calibration, the backup navigation scheme based on geomagnetic/starlight measurement is used to complete navigation without GNSS signal. Simulation results show that the scheme has high three-axis remanence calibration accuracy of 0.026nT, 0.293nT, 0.107nT, when GNSS signal is available. Errors of three-axis position and velocity of the backup navigation scheme are 87.3m, 172.5m, 65.2m, and 0.78m/s, 0.86m/s, 1.04m/s, when GNSS system is disturbed. The proposed scheme is feasible as well as efficient.