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题名: Assessment of conservative force models from GRACE accelerometers and precise orbit determination
作者: Calabia, Andres1, 2; Jin, Shuanggen1, 3
刊名: AEROSPACE SCIENCE AND TECHNOLOGY
出版日期: 2016-02-01
卷号: 49, 页码:80-87
关键词: Accelerometers ; Conservative forces ; Principal Component Analysis (PCA) ; Precise Orbit Determination (POD) ; GRACE
DOI: 10.1016/j.ast.2015.11.034
文章类型: Article
英文摘要: The accuracy of the conservative force-models is not clear and the new space accelerometers provide a unique opportunity for their validation. In this paper, the conservative-force model deficiencies are investigated via Principal Component Analysis (PCA) using 4 years of GRACE measurements (2006-2009). The deficiencies are assessed by comparing the accelerometer readouts with the differences between the conservative force-model and the precise orbit accelerations. Within this scheme, the spatiotemporal data analysis is synthesized in a time-series of grids whose latitudinal and longitudinal variations are respectively influenced by the half orbital period and the equatorial orbit shift. With maximum amplitude of 50 nm/s(2), the mean map shows a positive overestimation in Canada and Brazil and negative in Greenland. Explaining the 74% of the variability, the two first pairs of PCA modes show un-modeled patterns with amplitudes maxima of 80 nm/s(2) and 50 nm/s(2). Their periodic behavior and wave-length of degree-6 and degree-11s spherical harmonics strongly suggest an additional modeling and improvement. As for the long-term variations, our results show a latitudinal variation of 15 nm/s(2) maximum amplitude correlated with the day-night periods. Performing a combined analysis of ascending and descending orbits, a trend of 3 nm/s(2)yr in the Indian Ocean is also observed. Our new approach for orbital force models validation can be considered crucial for the current state-of-the-art of precise orbit determination (POD) and Time-Varying Gravity (TVG) modeling. (C) 2015 Elsevier Masson SAS. All rights reserved.
WOS标题词: Science & Technology ; Technology
类目[WOS]: Engineering, Aerospace
研究领域[WOS]: Engineering
关键词[WOS]: GRAVITY ; STABILITY ; ALTIMETRY ; PLATES ; ERROR ; TIDE
收录类别: SCI
项目资助者: National Keystone Basic Research Program (MOST 973)(2012CB72000) ; National Natural Science Foundation of China (NSFC)(11173050 ; Shanghai Science and Technology Commission(12DZ2273300) ; 11373059)
语种: 英语
WOS记录号: WOS:000369198300009
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16120
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Bulent Ecevit Univ, Dept Geomat Engn, TR-67100 Zonguldak, Turkey
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