Reference : Numerical Velocity determination and Calibration Methods for CHAMP Using the Energy B...
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Numerical Velocity determination and Calibration Methods for CHAMP Using the Energy Balance Approach
Weigelt, Matthias mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Sneeuw, N. [> >]
Gravity, Geoid and Space Missions
Jekeli, Christopher
Bastos, Luisa
Fernandes, Joana
International Association of Geodesy Symposia
Gravity, Geoid and Space Missions – GGSM2004
from 30-08-2004 to 03-09-2004
International Association of Geodesy
[en] Taylor differentiator ; champ ; crossover calibration ; energy balance ; fft ; high-pass filter
[en] More than two years of data of the champ satellite mission is available and the usage of the energy balance approach for global gravity field recovery has been successfully implemented by several groups around the world. This paper addresses two important aspects of the data processing. First, high-quality gravity recovery requires numerical differentiation of kinematic positions. Two methods are investigated using simulated and real dynamic data. It is shown that a third order Taylor differentiator is sufficient to reach good results. Second drift due to the accelerometer bias has to be corrected. Two possible approaches are discussed: cross-over calibration on the one hand calibration w.r.t. a reference model on the other hand. Currently the crossover calibration fails due to the insufficient accuracy of the crossover determination whereas the calibration w.r.t. a reference model gives good results.
Series Number 129

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