Computer Science – Sound
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2549h&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2549
Computer Science
Sound
Scientific paper
Oral presentation The ROSETTA/ESA probe will rendezvous Comet Wirtanen in 2011 and launch a Lander at the nucleus surface. The CONSERT instrument will perform the sounding of the comet nucleus by measuring a 90 MHz electromagnetic wave propagation from the Lander to the orbiter throughout the nucleus. The goal of this sounding is to determine the internal structures of the comet nucleus at different scales and to deduce information on its composition (density, type and abundance of the refractor). The probe has been launch in January and both Lander and Orbiter parts of the instrument have been ground and in-fly calibrated. The CONSERT instrument is an original concept of spaceborne transmission radar based on the propagation throughout the nucleus while the classical radars are based on the reflection. This instrument fulfills three functions: - A chronometer to measure the propagation delay (main function) - An imager based on the multipath propagation - A radiometer to estimate the wave attenuation (secondary function) The calibration of the instrument should characterize these three functions but due to the novelty of the instrument concept we have no classical set of parameters to quantify the instrument performances from a data-inversion point of view. The instrument design and the absence of calibration channel due to mass and power constraints require specific signal processing and calibration protocol. We start with the present the instrument, its objectives and its time transponder structure. Then we present the philosophy of the ground and in-fly calibration. In particular, we define the set of instrument performances used to characterize Consert instrument and the derivation of the calibration plan. We finish with the presentation of results of the instrument ground calibration and we show preliminary results of the in-fly calibration.
Herique Alain
Kofman Wlodek
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