Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | Observation of the Earth System from Space |
| Seiten | 271-285 |
| Seitenumfang | 15 |
| Publikationsstatus | Veröffentlicht - 2006 |
Abstract
To meet the accuracy requirements of the GOCE mission, the gradiometer has to be calibrated and validated internally as well as externally. An internal quality assessment of the observed GOCE data is possible by comparisons of observations at the same satellite position, i.e. at satellite track cross-overs. Due to the orbit characteristics of the mission, satellite ground track cross-overs have to be used instead of identical repeat positions. Therefore, an appropriate reduction concept has to be applied to consider the differences caused by different satellite altitudes and orientations. It is shown here, that present global gravity field models meet the accuracy and resolution requirements for the reduction concept, and hence for the relative validation of GOCE gradients. For an external calibration or validation based on regional data sets, terrestrial gravity anomalies are upward continued to gravitational gradients at GOCE altitude. The computations are done with synthetic data in a closed-loop simulation. Two upward continuation methods are considered, namely least-squares collocation and integral formulas based on the spectral combination technique. Both methods are described and the results are compared numerically with the ground-truth data. Finally, the results of a regional calibration experiment with simulated noisy GOCE gradients are described.
ASJC Scopus Sachgebiete
- Umweltwissenschaften (insg.)
- Allgemeine Umweltwissenschaft
- Erdkunde und Planetologie (insg.)
- Allgemeine Erdkunde und Planetologie
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Observation of the Earth System from Space. 2006. S. 271-285.
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Beitrag in Buch/Sammelwerk › Forschung › Peer-Review
}
TY - CHAP
T1 - Quality Assessment of GOCE Gradients
AU - Jarecki, Focke
AU - Wolf, Karen Insa
AU - Denker, Heiner
AU - Müller, Jürgen
N1 - Thanks go to K.-H. Ilk and IAG-SC7 for making the GOCE test data available and to C.C. Tscherning for providing his covariance computation routines. This is publication no. GEOTECH-158 of the programme GEOTECHNO- LOGIEN of BMBF and DFG, Grant 03F0329D
PY - 2006
Y1 - 2006
N2 - To meet the accuracy requirements of the GOCE mission, the gradiometer has to be calibrated and validated internally as well as externally. An internal quality assessment of the observed GOCE data is possible by comparisons of observations at the same satellite position, i.e. at satellite track cross-overs. Due to the orbit characteristics of the mission, satellite ground track cross-overs have to be used instead of identical repeat positions. Therefore, an appropriate reduction concept has to be applied to consider the differences caused by different satellite altitudes and orientations. It is shown here, that present global gravity field models meet the accuracy and resolution requirements for the reduction concept, and hence for the relative validation of GOCE gradients. For an external calibration or validation based on regional data sets, terrestrial gravity anomalies are upward continued to gravitational gradients at GOCE altitude. The computations are done with synthetic data in a closed-loop simulation. Two upward continuation methods are considered, namely least-squares collocation and integral formulas based on the spectral combination technique. Both methods are described and the results are compared numerically with the ground-truth data. Finally, the results of a regional calibration experiment with simulated noisy GOCE gradients are described.
AB - To meet the accuracy requirements of the GOCE mission, the gradiometer has to be calibrated and validated internally as well as externally. An internal quality assessment of the observed GOCE data is possible by comparisons of observations at the same satellite position, i.e. at satellite track cross-overs. Due to the orbit characteristics of the mission, satellite ground track cross-overs have to be used instead of identical repeat positions. Therefore, an appropriate reduction concept has to be applied to consider the differences caused by different satellite altitudes and orientations. It is shown here, that present global gravity field models meet the accuracy and resolution requirements for the reduction concept, and hence for the relative validation of GOCE gradients. For an external calibration or validation based on regional data sets, terrestrial gravity anomalies are upward continued to gravitational gradients at GOCE altitude. The computations are done with synthetic data in a closed-loop simulation. Two upward continuation methods are considered, namely least-squares collocation and integral formulas based on the spectral combination technique. Both methods are described and the results are compared numerically with the ground-truth data. Finally, the results of a regional calibration experiment with simulated noisy GOCE gradients are described.
KW - calibration
KW - cross-overs
KW - upward continuation
KW - validation
UR - http://www.scopus.com/inward/record.url?scp=67649739070&partnerID=8YFLogxK
UR - https://gfzpublic.gfz-potsdam.de/rest/items/item_23135_3/component/file_23134/content
U2 - 10.1007/3-540-29522-4_19
DO - 10.1007/3-540-29522-4_19
M3 - Contribution to book/anthology
AN - SCOPUS:67649739070
SN - 3540295208
SN - 9783540295204
SP - 271
EP - 285
BT - Observation of the Earth System from Space
ER -