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| Titel |
A first analysis of the mean motion of CHAMP |
| VerfasserIn |
F. Deleflie, P. Exertier, P. Berio, G. Metris, O. Laurain, J.-M. Lemoine, S. Loyer |
| 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 (2003-06-30), S.95-101 |
| Datensatznummer |
250000041
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| Publikation (Nr.) |
 copernicus.org/adgeo-1-95-2003.pdf |
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| Zusammenfassung |
The present study consists in studying the mean
orbital motion of the CHAMP satellite, through a single long
arc on a period of time of 200 days in 2001. We actually
investigate the sensibility of its mean motion to its accelerometric
data, as measures of the surface forces, over that period.
In order to accurately determine the mean motion of
CHAMP, we use “observed" mean orbital elements computed,
by filtering, from 1-day GPS orbits. On the other
hand, we use a semi-analytical model to compute the arc.
It consists in numerically integrating the effects of the mean
potentials (due to the Earth and the Moon and Sun), and the
effects of mean surfaces forces acting on the satellite. These
later are, in case of CHAMP, provided by an averaging of the
Gauss system of equations.
Results of the fit of the long arc give a relative sensibility
of about 10-3, although our gravitational mean model is not
well suited to describe very low altitude orbits. This technique,
which is purely dynamical, enables us to control the
decreasing of the trajectory altitude, as a possibility to validate
accelerometric data on a long term basis.
Key words. Mean orbital motion, accelerometric data |
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