Details
| Original language | English |
|---|---|
| Pages (from-to) | 54-59 |
| Number of pages | 6 |
| Journal | International Association of Geodesy Symposia |
| Volume | 129 |
| Publication status | Published - Sept 2005 |
| Externally published | Yes |
Abstract
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.
Keywords
- CHAMP, Crossover calibration, Energy balance, FFT, High-pass filter, Taylor differentiator
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Computers in Earth Sciences
- Earth and Planetary Sciences(all)
- Geophysics
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In: International Association of Geodesy Symposia, Vol. 129, 09.2005, p. 54-59.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Numerical velocity determination and calibration methods for champ using the energy balance approach
AU - Weigelt, M.
AU - Sneeuw, N.
PY - 2005/9
Y1 - 2005/9
N2 - 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.
AB - 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.
KW - CHAMP
KW - Crossover calibration
KW - Energy balance
KW - FFT
KW - High-pass filter
KW - Taylor differentiator
UR - http://www.scopus.com/inward/record.url?scp=84897046917&partnerID=8YFLogxK
U2 - 10.1007/3-540-26932-0_10
DO - 10.1007/3-540-26932-0_10
M3 - Article
AN - SCOPUS:84897046917
VL - 129
SP - 54
EP - 59
JO - International Association of Geodesy Symposia
JF - International Association of Geodesy Symposia
SN - 0939-9585
ER -