基于磁强计/太阳敏感器的自主导航方法

摘要

The magnetic field vector is a function of the satellite's position. Autonomous low earth orbit satellite navigation can be achieved based on the measurement data of the onboard three axis magnetometer and international geomagnetic reference field. Because the earth's magnetic field is indefinable and long term varia-bility, the navigation precision is limited by only using single magnetometer. A new information fusion method-based autonomous navigation method and filter algorithm is presented by using measuring information of the magnetometer and sun sensor in sun shining area form and sun shadow area form. The integrated navigation method and algorithm are designed and simulated. The computer simulation results show that the proposed sys-tem can improve the navigation precision and robustness.%地磁场矢量是关于卫星位置的函数,利用星载三轴磁强计测量地磁场矢量,并且引入国际地磁场参考模型标准值,即可确定卫星的位置和速度.由于地磁场模型存在不确定性和长期变化性,所以单一使用磁强计自主导航精度有限.提出一种基于三轴磁强计与太阳敏感器相结合的自主导航方法,将太阳敏感器输出的高精度矢量信息与地磁场信息相结合,设计在太阳光照区和太阳阴影区两种情况下基于信息融合的组合导航原理及滤波算法并进行数值仿真,通过对仿真结果进行分析和比较,论证所设计方法既提高了系统的导航精度和鲁棒性,又有利于工程实际应用.