NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An Evaluation of Recent Gravity Models wrt. Altimeter Satellite MissionsWith the launch of CHAMP and GRACE, we have entered a new phase in the history of satellite geodesy. For the first time, geopotential models are now available based almost exclusively on satellite-satellite tracking either with GPS in the case of the CHAMP-based geopotential models, or co-orbital intersatellite ultra-precise ranging in the case of GRACE. Different groups have analyzed these data, and produced a series of geopotential models (e.g., EIGENlS, EIGEN2, GGM0lS, GGMOlC) that incorporate the new data. We will compare the performance of these "newer" geopotential models with the standard models now used for computations, (e.g., JGM-3, BGM-96, PGS7727, and GRIMS-C1) for TOPEX, JASON, Geosat-Follow-On (GFO), and Envisat using standard metrics such as SLR RMS of fit, altimeter crossovers, and orbit overlaps. Where covariances are available we can evaluate the predicted geographically correlated orbit error. These predicted results can be compared with the Earth-fixed differences between dynamic and reduced-dynamic orbits to test the predictive accuracy of the covariances, as well as to calibrate the error of the solutions.
Document ID
20040040119
Document Type
Conference Paper
Authors
Lemoine, Frank G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zelensky, N. P. (Raytheon Information Technology and Scientific Services Upper Marlboro, MD, United States)
Luthcke, S. B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Beckley, B. D. (Raytheon Information Technology and Scientific Services Upper Marlboro, MD, United States)
Chinn, D. S. (Raytheon Information Technology and Scientific Services Upper Marlboro, MD, United States)
Rowlands, D. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Earth Resources and Remote Sensing
Meeting Information
TOPEX JASON Science Working Team Meeting(Arles)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.