Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1034l&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1034
Physics
Scientific paper
This paper shows numerical simulations to assess the precision that can be obtained on the determination of the Mars Rotation and orientation Parameters (MOP) by using radio link of ExoMars rover. The primary objective of such a radio-science experiment is a precise measurement of these quantities, which can be theoretically calculated for different states and sizes of the core, for different internal compositions, and for different interior temperature profiles. Precession and length-of-day variations have already been detected from spacecraft data. Precession is presently known at the 0.3% level [1] and length-of-day variations are known at about the 10% level [1]. We already know that a sufficient precision can be reached using Doppler measurements from a lander to improve our knowledge on the MOP and to provide some constraints on its physical parameters [2]. The goal of this paper is to evaluate the impact of different Exo- Mars mission parameters (frequency band, precision in rover positioning at surface, nature of the radio link (Direct-To-Earth (DTE) or with an orbiter)) in the determination of the MOP. The ExoMars nominal mission duration is very long, 700 days, providing a real opportunity to offset the negative impact of the displacement of the rover at the surface of the planet in this determination.
Dehant Véronique
Le Maistre Sébastien
Marty Jean-Charles
Rosenblatt Pascal
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