北斗卫星整网集中式自主定轨算法研究

Research on Centralized Autonomous Orbit Determination Algorithm for Beidou Satellites

由于分布式定轨算法只能得到局部次优解,为进一步提升北斗卫星自主导航算法精度,对北斗卫星整网集中式定轨算法在轨实现方法进行研究。设计了基于推广卡尔曼滤波算法的整网集中式定轨算法及其在轨实现流程,并利用北斗卫星上的龙芯1E300处理器对算法精度及工程可行性进行了评估。仿真结果表明,整网集中式算法精度优于分布式导航算法。且通过在龙芯1E300处理器上仿真验证可知,集中式导航算法已具备星上使用条件。

Due to the limitation of on-board processing capacity,Beidou satellite uses the distributed algorithm to realize inter-satellite link autonomous orbit determination.Since the distributed orbit determination algorithm can only acquire sub-optimal solution,to improve the accuracy of Beidou satellite autonomous navigation algorithm,the realization method of the centralized orbit determination algorithm for Beidou satellitesis studied.A centralized orbit determination algorithm based on extended Kalman filter algorithm is proposed and the on-orbit realization process of the algorithm is designed.Finally,the algorithm accuracy and engineering feasibility are evaluated by using the LONGXIN 1E300 processor on Beidou satellites.The simulation results show that the accuracy of the whole network centralized algorithm is better than that of the distributed navigation algorithm.The simulation on the LONGXIN 1E300 processor shows that the centralized navigation algorithm has met the requirements for satellite application.