THE NETLANDER IONOSPHERE AND GEODESY EXPERIMENT (NEIGE): Numerical simulations of Mars orientation determination.

Details THE NETLANDER IONOSPHERE AND GEODESY EXPERIMENT (NEIGE): Numerical simulations of Mars orientation determination. THE NETLANDER IONOSPHERE AND GEODESY EXPERIMENT (NEIGE): Numerical simulations of Mars orientation determination.

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5790v&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5790

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The NEIGE experiment, which is part of the Netlander mission with launch foreseen for 2009, will allow us to model the internal structure of Mars (non rigid versus rigid nutations) and to model its balance of volatiles (mainly seasonal CO2 mass exchanges at the polar ice caps) by analysing the radio Doppler tracking signal between a network of four stations on Mars surface and an orbiter and between this orbiter and the Earth. Because of the small amount of tracking data that will be obtained, we have developed an adapted strategy for the parameter adjustment (no time series). We numerically simulated Doppler data and used those to retrieve geophysical information by a least squares adjustment. The information is extracted from the Mars orientation variations and can be expressed in terms of a non-rigid transfer function for nutation and as harmonic expansions (mainly with annual and semi-annual period) for length-of-day variations (LOD) and polar motion. An instrumental noise of 0.1 mm/s and time biases relative to onboard clock drift are introduced. The landing site positions are also adjusted and the accuracy on the orbit retrieval is tested with respect to the angular momentum desaturation. The effect of the tracking coverage from the Earth on the orbit determination is also analysed. Our results show that we are able to extract the geophysical information that we are looking for after half a Martian year of observation. The accuracy on Mars orientation parameters is about a few mas (milli-arc seconds) for LOD variations and polar motion and less than 20% for non-rigid nutation parameters (see also others presentations on the NEIGE experiment at PS7 session). .

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