Galileo IOV卫星广播星历精度评估

Accuracy assessment of galileo IOV satellites broadcast ephemeris

介绍广播星历精度评估的基本原理与方法,在此基础上利用长达两年的广播星历数据分析比较Galileo现有IOV卫星的广播轨道精度、钟差精度以及整体精度SISRE的长期和短期变化趋势,结果表明,目前Galileo IOV卫星径向轨道精度优于0.5m,切向精度优于1.8m,法向精度优于1.5m,略优于切向,钟差精度优于5ns,SISRE优于1.3m。从星历精度的长期变化趋势来看,Galileo广播星历精度随系统发展有一定的改善。

The basic accuracy assessment theory and method of broadcast ephemeris are introduced firstly.Then this paper analyzes and compares the short-term and long-term trends of the broadcast ephemeris accuracy,clock bias accuracy and SISRE accuracy of Galileo existing IOV satellites with two-year-long broadcast ephemeris data based on the method.The results show that,now the accuracy of radial orbit of Galileo IOV satellites is better than 0.5m,the tangential one is better than 1.8mand the normal one is better than 1.5m which is better than tangential-direction slightly.Meanwhile,the RMS of clock bias is less than 5ns,and the accuracy of SISRE value is better than 1.3m.In addition,the long-term trend of Galileo broadcast ephemeris accuracy indicates that the accuracy of Galileo satellites broadcast ephemeris has been improved with the development of Galileo system.