伪随机脉冲参数对BDS卫星定轨精度的影响分析

摘要

采用附加伪随机脉冲参数的动力学定轨方法对BDS卫星进行定轨,分别给出不同时间间隔的伪随机脉冲参数估计方案对BDS卫星常规状态、姿态转换状态以及进入地影状态时定轨精度的影响.结果表明,常规状态下,伪随机脉冲参数对GEO卫星定轨精度改善显著,相对较优的伪随机脉冲参数估计间隔与各类卫星运行周期吻合;对于姿态转换状态以及进入地影状态,6h的伪随机脉冲参数估计间隔有助于提高相应卫星的定轨精度.%The BDS satellites have yaw attitude maneuver periods and may run in the shadow.These states reduce the orbit determination precision of the dynamic model.In view of the above problem,we use the dynamic orbit determination method,in which pseudo-stochastic pulse parameters are estimated together,to calculate BDS satellite orbits.We analyze the impacts of the pseudo-stochastic pulse parameters estimation schemes on the different estimation intervals of parameters on the orbit determination precisions of BDS satellites' different statuses,including normal status,yaw attitude maneuver status,and shadow running status.The results show that under the normal status,the precision of GEO satellite orbit determination is improved significantly by the pseudo-stochastic pulse parameters.The estimated interval of the pseudo-stochastic pulse parameters is in good agreement with all kinds of satellite operation periods.For the yaw attitude maneuver status and the shadow running status,the pseudo-stochastic pulse parameters,estimated every 6 hours,are helpful to improve the orbit determination precision of the corresponding satellites.