標題: Precise orbit determination for the FORMOSAT-3/COSMIC satellite mission using GPS
作者: Hwang, Cheinway
Tseng, Tzu-Pang
Lin, Tingjung
Svehla, Drazen
Schreiner, Bill
土木工程學系
Department of Civil Engineering
關鍵字: Attitude;FORMOSAT-3/COSMIC;GPS;Kinematic orbit;Reduced dynamic orbit
公開日期: 1-五月-2009
摘要: The joint Taiwan-US mission FORMOSAT-3/ COSMIC (COSMIC) was launched on April 17, 2006. Each of the six satellites is equipped with two POD antennas. The orbits of the six satellites are determined from GPS data using zero-difference carrier-phase measurements by the reduced dynamic and kinematic methods. The effects of satellite center of mass (COM) variation, satellite attitude, GPS antenna phase center variation (PCV), and cable delay difference on the COSMIC orbit determination are studied. Nominal attitudes estimated from satellite state vectors deliver a better orbit accuracy when compared to observed attitude. Numerical tests show that the COSMIC COM must be precisely calibrated in order not to corrupt orbit determination. Based on the analyses of the 5 and 6-h orbit overlaps of two 30-h arcs, orbit accuracies from the reduced dynamic and kinematic solutions are nearly identical and are at the 2-3 cm level. The mean RMS difference between the orbits from this paper and those from UCAR (near real-time) and WHU (post-processed) is about 10 cm, which is largely due to different uses of GPS ephemerides, high-rate GPS clocks and force models. The kinematic orbits of COSMIC are expected to be used for recovery of temporal variations in the gravity field.
URI: http://dx.doi.org/10.1007/s00190-008-0256-3
http://hdl.handle.net/11536/7253
ISSN: 0949-7714
DOI: 10.1007/s00190-008-0256-3
期刊: JOURNAL OF GEODESY
Volume: 83
Issue: 5
起始頁: 477
結束頁: 489
顯示於類別:期刊論文


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