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| Titel |
Assessment of two methods for gravity field recovery from GOCE GPS-SST orbit solutions |
| VerfasserIn |
K. Arsov, R. Pail |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: G1. The new gravity field mission (CHAMP, GRACE, GOCE): from measurements to geophysical interpretation ; Nr. 1 (2003-07-11), S.121-126 |
| Datensatznummer |
250000046
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-121-2003.pdf |
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| Zusammenfassung |
In the course of the GOCE satellite mission, the
high-low Satellite to Satellite Tracking (SST) observations
have to be processed for the determination of the long wavelength
part of the Earth’s gravity field. This paper deals with
the formulation of the high-low SST observation equations,
as well as the methods for gravity field recovery from orbit
information. For this purpose, two approaches, i.e. the
numerical integration of orbit perturbations, and the evaluation
of the energy equation based on the Jacobi integral, are
presented and discussed. Special concern is given to the numerical
properties of the corresponding normal equations. In
a closed-loop simulation, which is based on a realistic orbit
GOCE configuration, these methods are compared and assessed.
However, here we process a simplified case assuming
that non-conservative forces can be perfectly modelled. Assuming
presently achievable accuracies of the Precise Orbit
Determination (POD), it turns out that the numerical integration
approach is still superior, but the energy integral approach
may be an interesting alternative processing strategy
in the near future.
Key words. High-low SST – gravity field – GOCE – variational
equations – least squares adjustment |
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