EOP预报误差对自主定轨结果影响分析

ANALYSIS OF INFLUENCE OF EOP PREDICTION ERROR ON AUTONOMOUS ORBIT DETERMINATION

对地球定向参数的预报误差变化趋势和地球定向参数预报误差对自主定轨生成星历影响及由此给定位产生的影响的分析结果表明:地球定向参数预报误差对长期(110天)自主定轨轨道的径向误差和卫星钟差几乎没有影响,主要影响水平方向(切向和法向)误差,并且这种影响呈现一定的周期性,由此给定位带来的误差影响主要在东西方向和南北方向。

In 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 not upload the latest EOP,the system can only use long-term prediction of EOP.EOP prediction error will affect the ephemeris offered by the autonomous navigation system,and ultimately affect positioning accuracy of users.EOP prediction errors,the influence of EOP prediction errors to autonomous navigation system orbit ephemeris and positioning accuracy of users are discussed and analyzed.The results show that the prediction error of EOP almost has no influence on the radial error of satellite orbit and satellite clock error in long-term（110 days） autonomous orbit determination.It mainly influences the Plane Error（Along Error and Cross Error） and URE（User Range Error） and these errors show a certain periodicity.Moreover,these errors mainly influences North-South direction error and East-West direction error in pseudorange positioning.