Multipath error detection and correction for GEO/IGSO satellites

	Multipath error detection and correction for GEO/IGSO satellites
	Wu XiaoLi 1,2; Zhou JianHua 1; Wang Gang 1; Hu XiaoGong2 ; Cao YueLing2
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2012-07-01
卷号	55 期号:7 页码:1297-1306
关键词	multipath error carrier smoothing pseudorange GEO satellite position error
英文摘要	Constellations of regional satellite navigation systems are usually constituted of geostationary satellites (GEO) and inclined geostationary satellites (IGSO) for better service availability. Analysis of real data shows that the pseudorange measurements of these two types of satellites contain significant multipath errors and code noise, and the multipath for GEO is extremely serious, which is harmful to system services. In contrast, multipath error of carrier phase measurements is less than 3 cm, which is smaller than the multipath of pseudorange measurements by two orders of magnitude. Using a particular combination of pseudorange and dual-frequency carrier phase measurements, the pseudorange multipath errors are detected, and their time varying features are analyzed. A real-time multipath correction algorithm is proposed in this paper, which is called CNMC (Code Noise and Multipath Correction). The algorithm decreases the influence of the multipath error and therefore ensures the performance of the system. Data processing experiments show that the multipath error level may be reduced from 0. 5 m to 0. 15 m by using this algorithm, and 60% of GEO multipath errors and 42% of IGSO multipath errors are successfully corrected with CNMC. Positioning experiments are performed with a constellation of 3 GEO plus 3 IGSO satellites. For dual-frequency users the East-West position accuracy is improved from 1.31 m to 0.94 m by using the CNMC algorithm, the South-North position accuracy is improved from 2.62 m to 2.29 m, and the vertical position accuracy is improved from 4.25 m to 3.05 m. After correcting multipath errors, the three-dimensional position accuracy is improved from 5.16 m to 3.94 m.
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:000305419500026
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18092]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Beijing Global Informat Applicat & Dev Ctr, Beijing 100094, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Wu XiaoLi,Zhou JianHua,Wang Gang,et al. Multipath error detection and correction for GEO/IGSO satellites[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2012,55(7):1297-1306.
APA	Wu XiaoLi,Zhou JianHua,Wang Gang,Hu XiaoGong,&Cao YueLing.(2012).Multipath error detection and correction for GEO/IGSO satellites.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,55(7),1297-1306.
MLA	Wu XiaoLi,et al."Multipath error detection and correction for GEO/IGSO satellites".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 55.7(2012):1297-1306.