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

	Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System
	He Feng 1,2,3; Zhou ShanShi1 ; Hu XiaoGong1 ; Zhou JianHua 3; Liu Li3 ; Guo Rui 3; Li XiaoJie 3; Wu Shan 3
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2014-07-01
卷号	57 期号:7 页码:1395-1403
关键词	satellite navigation orbital mechanics time synchronization ephemeris fitting
英文摘要	Satellite-station two-way time comparison is a typical design in Beidou System (BDS) which is significantly different from other satellite navigation systems. As 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 error. Meanwhile, 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 receiver. It 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 SLR. In 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 BDS. Considering 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 synchronization. In addition, the orbit error can be predicted and corrected in a short time based on its periodic characteristic. It 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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
收录类别	SCI
语种	英语
WOS记录号	WOS:000336748200025
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/16351]
专题	上海天文台_天文技术研究室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China
推荐引用方式 GB/T 7714	He Feng,Zhou ShanShi,Hu XiaoGong,et al. Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2014,57(7):1395-1403.
APA	He Feng.,Zhou ShanShi.,Hu XiaoGong.,Zhou JianHua.,Liu Li.,...&Wu Shan.(2014).Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,57(7),1395-1403.
MLA	He Feng,et al."Satellite-station time synchronization information based real-time orbit error monitoring and correction of navigation satellite in Beidou System".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 57.7(2014):1395-1403.