M
G
Last name: METRIS
First name: G.
International audience
International audience
International audience
International audience
International audience
International audience
International audience
In the last decades the important increase of the number of positioning satellite constellations (GNSS, Global Navigation Satellite System), such as GPS, GLONASS, BeiDou and Galileo, has motivated a growing interest in the dynamics of the Medium Earth Orbits (MEOs). Numerical experiments show that resonances can affect the stability of MEOs;...
International audience
International audience
International audience
International audience
International audience
International audience
International audience
Nonlinearity, 18, pp. 45-54, http://dx.doi.org./10.1088/0951-7715/18/1/003
This paper describes the application of an evolutionary optimization method to design satellite constellation for continuous regional coverage without intersatellite links. This configuration, called mutual coverage, is related to some technical limitations that exist on small satellite technology. The coverage of the north Algerian...
International audience
The existence of a light or massive scalar field with a coupling to matter weaker than gravitational strength is a possible source of violation of the weak equivalence principle. We use the first results on the Eötvös parameter by the MICROSCOPE experiment to set new constraints on such scalar fields. For a massive scalar field of mass smaller...
This paper reports the results of an analysis of the Doppler tracking data of Pioneer probes which did show an anomalous behaviour. A software has been developed for the sake of performing a data analysis as independent as possible from that of J. Anderson et al. \citep{anderson}, using the same data set. A first output of this new analysis is...
Recent studies show a change, starting in 1998, in the behavior of the variation of the dynamical flattening of the Earth (J2), supposed to be constant (secular), and mainly due to the post glacial rebound effect. In this paper, we study to what extent this behavior can be correlated or not with the 18.6 year tide: with more than twenty years...
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...