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A first analysis of the mean motion of CHAMP
1Observatoire de la Côte d’Azur – CERGA/GRGS, Av. N. Copernic F-06130 Grasse, France
2Observatoire Midi-Pyrénées OMP/GRGS, Av. E. Belin, F-31400 Toulouse, France
Abstract. 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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Citation: Deleflie, F., Exertier, P., Berio, P., Metris, G., Laurain, O., Lemoine, J.-M., and Loyer, S.: A first analysis of the mean motion of CHAMP, Adv. Geosci., 1, 95-101, 2003. Bibtex EndNote Reference Manager
