標題: Low-degree gravity change from GPS data of COSMIC and GRACE satellite missions
作者: Lin, Tingjung
Hwang, Cheinway
Tseng, Tzu-Pang
Chao, B. F.
土木工程學系
Department of Civil Engineering
關鍵字: FORMOSAT-3/COSMIC;GPS;GRACE;Geoid change;Zonal coefficient
公開日期: 1-一月-2012
摘要: This paper demonstrates estimation of time-varying gravity harmonic coefficients from GPS data of COSMIC and GRACE satellite missions. The kinematic orbits of COSMIC and GRACE are determined to the cm-level accuracy. The NASA Goddard's GEODYN 11 software is used to model the orbit dynamics of COSMIC and GRACE, including the effect of a static gravity field. The surface forces are estimated per one orbital period. Residual orbits generated from kinematic and reference orbits serve as observables to determine the harmonic coefficients in the weighted-constraint least-squares. The monthly COSMIC and GRACE GPS data from September 2006 to December 2007 (16 months) are processed to estimate harmonic coefficients to degree 5. The geoid variations from the GPS and CSR RL04 (GRACE) solutions show consistent patterns over space and time, especially in regions of active hydrological changes. The monthly GPS-derived second zonal coefficient closely resembles the SLR-derived and CSR RL04 values, and third and fourth zonal coefficients resemble the CSR RL04 values. (C) 2011 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jog.2011.08.004
http://hdl.handle.net/11536/15710
ISSN: 0264-3707
DOI: 10.1016/j.jog.2011.08.004
期刊: JOURNAL OF GEODYNAMICS
Volume: 53
Issue: 
起始頁: 34
結束頁: 42
顯示於類別:期刊論文


文件中的檔案:

  1. 000300461900005.pdf