Galileo IOV卫星广播星历精度评估

摘要

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0.5 m,切向精度优于1.8 m,法向精度优于1.5 m,略优于切向,钟差精度优于5 ns,SISRE优于1.3 m.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 1.8 m and the normal one is better than 1.5 m which is better than tangential-direction slightly.Meanwhile,the RMS of clock bias is less than 5 ns,and the accuracy of SISRE value is better than 1.3 m.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.