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Published in:
2010 | OriginalPaper | Chapter
Orbit Predictions for CHAMP and GRACE
Authors : Krzysztof Snopek, Daniel König, Rolf König
Published in: System Earth via Geodetic-Geophysical Space Techniques
Publisher: Springer Berlin Heidelberg
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Abstract
The orbit prediction system of GFZ is an indispensable tool for Satellite Laser Ranging (SLR) stations tracking the satellites CHAMP, GRACE-A/B, and TerraSAR-X, for providing orbit information for initial processing of mission data, and for the purpose of mission operations. The system is presented regarding its structure and quality performance. Outside the proper orbit determination the pre- and post-processing parts of the system have steadily been developed to become more robust for automated processing. Various changes in modelling the orbit forces have led to improved quality of the predicted orbits which is monitored regularly. A quality analysis shows an increasing accuracy in terms of along-track errors or time bias of predicted orbits. The improvement is related to both the decreasing solar activity and to the usage of better models and parameterizations in orbit determination.