Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System

作     者：HE Feng ZHOU ShanShi HU XiaoGong ZHOU JianHua LIU Li GUO Rui LI XiaoJie WU Shan 

作者机构：Shanghai Astronomical ObservatoryChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Beijing Satellite Navigation Center 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2014年第57卷第7期

页      面：1395-1403页

核心收录：

学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11103064) the Basic Research Foundation Program of Education Ministry Key Laboratory for Earth Space Environment and Geodetic survey,China(Grant No.11-01-06) 

主　　题：satellite navigation orbital mechanics time synchronization ephemeris fitting 

摘      要：Satellite-station two-way time comparison is a typical design in Beidou System(BDS)which is significantly different from other satellite navigation *** a type of two-way time comparison method,BDS time synchronization is hardly influenced by satellite orbit error,atmosphere delay,tracking station coordinate error and measurement model ***,single-way time comparison can be realized through the method of Multi-satellite Precision Orbit Determination(MPOD)with pseudo-range and carrier phase of monitor *** is proved in the constellation of 3GEO/2IGSO that the radial orbit error can be reflected in the difference between two-way time comparison and single-way time comparison,and that may lead to a substitute for orbit evaluation by *** this article,the relation between orbit error and difference of two-way and single-way time comparison is illustrated based on the whole constellation of *** the all-weather and real-time operation mode of two-way time comparison,the orbit error could be quantifiably monitored in a real-time mode through comparing two-way and single-way time *** addition,the orbit error can be predicted and corrected in a short time based on its periodic *** is described in the experiments of GEO and IGSO that the prediction accuracy of space signal can be obviously improved when the prediction orbit error is sent to the users through navigation message,and then the UERE including terminal error can be reduced from 0.1 m to 0.4 m while the average accuracy can be improved more than 27%.Though it is still hard to make accuracy improvement for Precision Orbit Determination(POD)and orbit prediction because of the confined tracking net and the difficulties in dynamic model optimization,in this paper,a practical method for orbit accuracy improvement is proposed based on two-way time comparison which can result in the reflection of orbit error.