Impact of ambiguity resolution with sequential constraints on real-time precise GPS satellite orbit determination

doi:10.1007/s10291-019-0878-3

	Impact of ambiguity resolution with sequential constraints on real-time precise GPS satellite orbit determination
	Li, Zongnan ; Li, Min 1; Shi, Chuang 1,2; Fan, Lei 2; Liu, Yang 1,3; Song, Weiwei 1; Tang, Weiming 1; Zou, Xuan 1
刊名	GPS SOLUTIONS
	2019-07
卷号	23 期号:3
关键词	Ambiguity resolution Precise orbit determination Real-time SRIF Fixing rate Accuracy evaluation
ISSN号	1080-5370
DOI	10.1007/s10291-019-0878-3
英文摘要	The real-time precise orbit is an essential prerequisite for a real-time precise point positioning service. Focusing on the impact of ambiguity resolution on real-time orbital precision, we propose an efficient approach for real-time ambiguity resolution, which consists of two modules. The first module resolves the double-differenced ambiguities according to their proximity to the nearest integer. The second module sequentially adds the resolved integer ambiguity constraints to the square-root information filter process, after confirming that the same constraints have not been imposed before the current epoch. To validate our method, GPS data collected from 100 globally distributed stations are used to simulate a real-time precise orbit determination. The convergence performance is analyzed, and the accuracy of the orbit is evaluated. The results show that: (1) Almost 90% of the double-differenced ambiguities are fixed correctly in real time for baselines shorter than 1000km. (2) After application of the proposed approach, the root-mean-square errors of all the satellite orbits are reduced from (5.9, 3.4, 2.3)cm to (4.7, 2.6, 2.2)cm for the along-track, cross-track and radial directions, respectively, with improvements of about 22% for the along-track and cross-track directions, and 6% for the radial direction. (3) Simulated real-time orbits determined with this method can obtain almost the same accuracy as some ultra-rapid products and, particularly, better accuracy can be achieved for eclipsing satellites.
电子版国际标准刊号	15211886
资助项目	Shanxi Key Laboratory of Integrated and Intelligent Navigation[SKLIIN-20180202]
WOS研究方向	Remote Sensing
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000472182100002
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27631]
专题	自然资源部第一海洋研究所
通讯作者	Li, Min; Shi, Chuang
作者单位	1.Wuhan Univ, GNSS Res Ctr, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China 2.Beihang Univ, Sch Elect Engn, 37 Acad Rd, Beijing 100083, Peoples R China 3.Minist Nat Resources, Inst Oceanog 1, 6 Xianxialing Rd, Qingdao 266061, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Li, Zongnan,Li, Min,Shi, Chuang,et al. Impact of ambiguity resolution with sequential constraints on real-time precise GPS satellite orbit determination[J]. GPS SOLUTIONS,2019,23(3).
APA	Li, Zongnan.,Li, Min.,Shi, Chuang.,Fan, Lei.,Liu, Yang.,...&Zou, Xuan.(2019).Impact of ambiguity resolution with sequential constraints on real-time precise GPS satellite orbit determination.GPS SOLUTIONS,23(3).
MLA	Li, Zongnan,et al."Impact of ambiguity resolution with sequential constraints on real-time precise GPS satellite orbit determination".GPS SOLUTIONS 23.3(2019).