Uncertainties and effects on geocenter motion estimates from global GPS observations

	Uncertainties and effects on geocenter motion estimates from global GPS observations
	Zhang, Xinggang 1,2; Jin, Shuanggen1
刊名	ADVANCES IN SPACE RESEARCH
	2014-07-01
卷号	54 期号:1 页码:59-71
关键词	Geocenter motion Surface loading GPS GRACE SLR
英文摘要	Global positioning system (GPS) observations can be used to estimate the geocenter motion, but are subjected to large uncertainties and effects due to uneven distribution of GPS stations and high-degree aliasing errors. In this paper, uncertainties and effects on geocenter motion estimates from global GPS observations are investigated and assessed with different truncated degrees and selected GPS network distributions based on different plate motion models, including NUVEL-1A, MORVEL56 and ITRF08. Results show that the selected GPS stations have no big effects on geocenter motion estimates based on different plate motion models, while large uncertainties are found at annual and semi-annual components when using different truncated degrees. Correlations of geocenter motion estimates from selected GPS networks with GRACE and SLR are better with truncated degree 3, and higher truncated degrees will degrade geocenter estimates. Smaller RMS also shows better results with the truncated degree 3 and the NUVEL1A has the worse results because more GPS sites are eliminated. For annual signal with truncated degree 3, four GPS strategies can reduce annual amplitudes by about 29.2% in X, 5.6% in Y, and 27.9% in Z with respect to truncated degree 1. Annual phases of all GPS solutions from MORVEL56 and ITRF08 are almost close to the GRACE solution with truncated degrees from 3 to 10, while the semi-annual signals are relatively weaker for all cases. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
研究领域[WOS]	Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
关键词[WOS]	CURRENT PLATE MOTIONS ; EARTH ; DEFORMATION ; GRAVITY ; GRACE
收录类别	SCI
语种	英语
WOS记录号	WOS:000337996000006
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/16213]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xinggang,Jin, Shuanggen. Uncertainties and effects on geocenter motion estimates from global GPS observations[J]. ADVANCES IN SPACE RESEARCH,2014,54(1):59-71.
APA	Zhang, Xinggang,&Jin, Shuanggen.(2014).Uncertainties and effects on geocenter motion estimates from global GPS observations.ADVANCES IN SPACE RESEARCH,54(1),59-71.
MLA	Zhang, Xinggang,et al."Uncertainties and effects on geocenter motion estimates from global GPS observations".ADVANCES IN SPACE RESEARCH 54.1(2014):59-71.