OBSERVATIONS OF GEOGRAPHICALLY CORRELATED ORBIT ERRORS FOR TOPEX POSEIDON USING THE GLOBAL POSITIONING SYSTEM

Citation
Ej. Christensen et al., OBSERVATIONS OF GEOGRAPHICALLY CORRELATED ORBIT ERRORS FOR TOPEX POSEIDON USING THE GLOBAL POSITIONING SYSTEM, Geophysical research letters, 21(19), 1994, pp. 2175-2178
Citations number
8
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
00948276
Volume
21
Issue
19
Year of publication
1994
Pages
2175 - 2178
Database
ISI
SICI code
0094-8276(1994)21:19<2175:OOGCOE>2.0.ZU;2-S
Abstract
We have compared Global Positioning System (GPS)-based dynamic and red uced-dynamic TOPEX/Poseidon orbits over three 10-day repeat cycles of the ground-track. The results suggest that the prelaunch joint gravity model (JGM-1) introduces geographically correlated errors (GCEs) whic h have a strong meridional dependence. The global distribution and mag nitude of these GCEs are consistent with a prelaunch covariance analys is, with estimated and predicted global rms error statistics of 2.3 an d 2.4 cm rms, respectively. Repeating the analysis with the post-launc h joint gravity model (JGM-2) suggests that a portion of the meridiona l dependence observed in JGM-1 still remains, with a global rms error of 1.2 cm.