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为了降低对地面测控站的依赖,提升导航卫星自身的自主运行能力具有重要意义。导航卫星在轨道控制期间,自主定轨误差将会产生重大偏差,为了能够快速恢复星历,提升导航系统的应用效率,针对导航卫星轨控期间的自主轨道确定技术进行了研究。首先,在传统的天文导航的基础上引入了加速度信息,然后根据加速度计测量以及估计误差判断,选择合适的时机在轨控期间对估计误差方差阵进行重置。仿真结果表明,基于加速度信息的自适应导航滤波算法,能够有效降低导航误差收敛时间,同时降低估计误差峰值。
In order to reduce the dependence on the ground control station, it is of great significance to upgrade the autonomous operation capability of the navigation satellite. During the orbit control of navigation satellite, the discretion of autonomous orbit determination will be greatly deviated. In order to be able to quickly recover the ephemeris and improve the application efficiency of the navigation system, the autonomous orbit determination technology during navigation satellite orbit control is studied. First of all, based on traditional astronomical navigation, the accelerometer information is introduced. Then, according to the accelerometer measurement and estimation error judgment, we select the appropriate timing to reset the estimation error variance matrix during the orbit control. The simulation results show that the adaptive navigation filter algorithm based on acceleration information can effectively reduce the navigation error convergence time and reduce the estimation error peak.