星地测量数据部分丢失对卫星钟差预报精度的影响

Effect on satellite clock offset prediction of satellite-ground observations loss

本文研究了不同的测量数据丢失概率对卫星钟差预报精度的影响,给出了卫星钟差的3阶白噪声状态方程和基于星地无线电双向时间比对的测量方程,得到了类似于Kalman滤波器的递归形式和修正Riccati方程;随着时间的推进,修正Riccati方程的预测误差逐渐减小,直至达到稳态;并根据修正Riccati方程,采用数值分析方法得到了典型参数情况下卫星钟差预报精度与测量数据有效率的关系曲线。

In the paper, the state equation and the measurement equation of satellite clock offset were presented, and the analogous Kalman filter in recursive form and modified Riecati equation were given, fi- nally numerical calculation was done according to the modified Riceati equation in the ease of typical param- eters and the relation between satellite clock offset prediction precision and observation data availability rate in curves were obtained.