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| Titel |
Local gravity field continuation for the purpose of in-orbit calibration of GOCE SGG observations |
| VerfasserIn |
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 (2003-06-17), S.11-18 |
| Datensatznummer |
250000030
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-11-2003.pdf |
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| Zusammenfassung |
The use of ground gravity data in wellsurveyed
areas, continued upward to satellite altitude, is
one of the most promising external absolute in-orbit calibration/
validation methods for GOCE satellite gravity gradient
(SGG) observations. Based on a synthetic gravity test environment
– providing in addition to statistical error information
also absolute error estimates – several upward continuation
methods, e.g. least squares collocation, equivalent
source techniques using point masses or area density distributions
defined on a spherical surface section, are described,
assessed and compared. It turns out that all these strictly
local approaches fail to work sufficiently accurate. Consequently,
a combined adjustment strategy is proposed, supporting
the high-quality gravity field information within the
well-surveyed test area with a low-accuracy, but globally defined
Earth model. Under quite realistic assumptions the upward
continuation is performed with rms errors in the order
of 1 mE. The most crucial limiting factor of this method is
spectral leakage in the course of an adequate representation
of the initial gravity information, which can be overcome by
an enlargement of the parameter model in combination with
a priori filtering of the initial gravity data.
Key words. Satellite gravity gradiometry – GOCE – calibration
– least squares adjustment |
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