Numerical simulations of the NEIGE experiment: Effect of angular momentum desaturation and landing sites positions determination on mars rotation estimates.

Details Numerical simulations of the NEIGE experiment: Effect of angular momentum desaturation and landing sites positions determination on mars rotation estimates. Numerical simulations of the NEIGE experiment: Effect of angular momentum desaturation and landing sites positions determination on mars rotation estimates.

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6668r&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6668

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Scientific paper

In the frame of the NEIGE (Netlander Ionosphere and Geodesy Experiment) experiment, the orbit of the spacecraft around Mars must be determined with a sufficient accuracy. Frequent angular momentum desaturations are expected to induce a significant error on the orbit determination. By carrying out numerical simulations, we analyze the impact of desaturation on both orbit determination and Mars rotation parameters (nutation, length of day and polar motion) estimates that are the scientific objectives of NEIGE. Several configurations have been analyzed by varying both rate of desaturation maneuvers (3 and 6 per day) and period of DSN (Deep Space Network) tracking (4 or 8 hours per day). We find that either low rate of desaturation or long period of tracking permit to reach the NEIGE objectives (a few milli-arc seconds of precision on Mars rotation) because the orbit determination is not really deteriorated (a few centimeters of error). However, the orbit is not well determined when considering both high desaturation and low tracking rates (tens of centimeters of error on orbit). Another need of the NEIGE experiment is to take into account the uncertainty on the landing sites positions. In our numerical simulations we determine those positions with a precision of a few centimeters after half a Martian year. The Mars rotation parameters are also estimated with the required accuracy. Such a precision is obtained based on a good estimate of the orbit. We therefore foresee to simulate the desaturation effect and the landing site positions determination together. Other perturbations on the Doppler signal will be added (see other presentations about NEIGE at PS7 and PS2 sessions).

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