Computer Science – Performance
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2535k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2535
Computer Science
Performance
Scientific paper
The CONSERT is the experiment on board of the ROSETTA mission that will provide information about the deep interior of the comet. The primary goal of CONSERT is to measure average dielectric and attenuation properties of the comet, provide estimates for the degree of homogeneity of the comet and to image its interior (Kofman et al, 1998). In this experiment, an electromagnetic signal is transmitted between the lander, located on the comet surface, and the orbiter. The transmitted signal will be measured as a function of time and as a function of the relative position of the orbiter and the lander for a number of orbits. An electromagnetic wavefront will propagate through the cometary nucleus at a smaller velocity than in free space and loses energy in the process. Both the change in velocity and the energy loss depend on the complex permittivity of the cometary materials. Thus, any signal that has propagated through the medium contains information concerning this medium. If a sufficient number of orbits were available, one would be able to obtain many cuts of the interior of the comet and therefore to build up a tomographic image of the interior. The time transponder technique was adopted to build CONSERT (Kofman et al, 1998, Barbin et al, 1999). In this presentation we describe the final realization of electronics and of antennas on the lander and on the orbiter. We show their performances and discuss theme from the point of view of the science objectives of the experiment. The results of field experiments on the spare models are shown. Finally we address the simulations of the propagation and inversion techniques.
Consert Team
Goutail J.-P.
Herique Alain
Kofman Wlodek
Nielsen Edward
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