单颗导航卫星区域定轨钟差影响精度分析

ACCURACY ANALYSIS OF INFLUENCE OF CLOCK ERROR ON SINGLE NAVIGATION SATELLITE ORBIT DETERMINATION BASED ON REGIONAL DATA

讨论在区域单颗导航卫星的精密轨道确定中,钟差对单颗导航卫星定轨的影响及理想状态下基于区域测轨数据所能达到的精度。根据单颗导航卫星定轨中钟差的不同处理策略,比较分析了钟差对其轨道的影响;通过分析消除钟差影响后的理想条件下的轨道精度,讨论基于区域数据单颗导航卫星定轨达到的最佳精度。试验结果表明,基于中国境内的区域数据,受到跟踪站分布结构的制约,轨道求解的精度容易受到钟差与测量噪声的影响。当钟差消除后,在仅受观测噪声影响的理想条件下,轨道的径向和位置精度分别优于2m和10m。

The effect of clock error on the orbit determination of single navigation satellite and the accuracy in the ideal situation based on regional data are discused. Three different strategies for dealing with clock error are compared to analyse this effect on orbit. After removing the clock error, the optimal accuracy based on regional data can be reached under such ideal circumstances. GPS single navigation satellite orbit determination can be imple- mented based on the field data from 5 GPS tracking stations in China. The results show that the orbit of single navigation satellite is more likely to be affected by clock error and noise of observations because of geometric distribution limitation of tracking stations. After removing the clock error from observations the orbit accuracy is better than 2 meters and 10 meters in radial direction and position respectively under such ideal circumstances, as the measurement noise becomes the predominant error source that affects the orbit.