【作者】 张卫星； 李征航； 刘万科；

【Author】 ZHANG Weixing~1,LI Zhenghang~2,LIU Wanke~3 1.School of Geodesy and Geomatics,Wuhan University,WuhanHubei,China,430079 2.School of Geodesy and Geomatics,Wuhan University,WuhanHubei,China,430079 3.School of Geodesy and Geomatics,Wuhan University,WuhanHubei,China,430079

【机构】 武汉大学测绘学院；

【摘要】 卫星导航系统在定轨当中,需要使用地面站上传的地球定向参数(EOP:Earth Orientation Parameters)预报值来实现地心地固坐标系与地心惯性坐标系之间的相互转换。但是当卫星导航系统进入自主定轨模式时,地面站不能按时上传最新的EOP,导航系统只能使用长期预报的EOP,然而由于地球自转本身存在不均匀变化的特性,导致了EOP的预报存在一定的误差,由此引起自主定轨解算生成的星历误差,最终影响使用该星历用户的定位精度。本文就此对EOP的预报误差和EOP预报误差对长期自主定轨生成的广播星历影响及由此给定位产生的影响进行分析和讨论。更多还原

【Abstract】 During the autonomous orbit determination,we need EOP uploaded by ground station to achieve translation of Conventional Terrestrial System and Geocentric Celestial Reference System.However,when the satellite navigation system gets into autonomous navigation mode,the ground station can’t upload the latest EOP,the system can only use long-term prediction of EOP.Since the earth rotation is not equable, there must be some errors in the prediction of EOP.These errors affect the ephemeris offered by the autonomous navigation system,and ultimately affect positioning accuracy of users.This paper has discussed and analyzed EOP prediction errors,the influence of EOP prediction errors to autonomous navigation system orbit ephemeris and positioning accuracy of users.更多还原