利用SLR和伪距资料确定导航卫星钟差

Determination of Navigation Satellite Clock Bias Using SLR and Pseudorange Data

提出了综合利用SLR和GPS伪距资料测定导航卫星钟差的方法,采用2002年10月的SLR和伪距实测数据计算了GPS35卫星的钟差,并对GPS35卫星的钟差进行了预报,为了验证计算结果的精度,将本文计算的卫星钟差与IGS精密钟差进行了比较。通过比较分析发现:综合利用SLR和伪距资料测定的导航卫星钟差精度优于3ns,测定的导航卫星钟差与实际卫星钟差不存在系统差;导航卫星钟差的预报精度与计算卫星钟速的时间跨度有关;可以分离卫星坐标和卫星钟差之间的相互影响,便于对卫星钟差的研究。

A new method for determining navigation satellite clock bias is presented by using SLR data and pseudoranges data. The bias of GPS 35 satellite clock is computed and predicted by using the data observed on October 2002. The results are compared with the GPS 35 clock bias of IGS. By comparison and analysis, the following facts can be drawn. 1. The precision of navigation satellite clock bias is better than 3 nanosecond, when the clock bias is calculated by using SLR data and pseudoranges data. There is no systematic error between our results and IGS's clock bias. 2. The precision of predicted clock bias has relations with the time span of computing the rate of satellite clock bias. The longer the time span, the lower the precision of satellite clock bias. 3. The new method can separate satellite orbit and clock bias, it is beneficial to researching satellite clock bias.