Simultaneous estimation of the martian rotation parameters and J_2 seasonal variations in the frame of the NEIGE experiment

Details Simultaneous estimation of the martian rotation parameters and J_2 seasonal variations in the frame of the NEIGE experiment Simultaneous estimation of the martian rotation parameters and J_2 seasonal variations in the frame of the NEIGE experiment

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....5909d&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #5909

Physics

Scientific paper

In Geodesy, spacecraft motion is an important filter for the data, so a necessary condition for the success of the NEtlander Ionosphere and Geodesy Experiment, NEIGE, is an accurate determination of the orbit. The varying gravity field of Mars, which reflects the planet's mass distribution, perturbs the spacecraft motion. In particular, we consider here the mass redistribution related to the significant atmospheric mass (up to 30%) that condenses on the polar ice caps during winter. This global-scale seasonal cycle will influence the variation of some gravity field, such as J_2, as well as the variation of planet's orientation parameters, such as length of day (LOD).
We have performed numerical simulations of NEIGE (orbiter-lander link) and DSN (Deep Space Network, orbiter-Earth link) Doppler tracking signals to estimate the ability to detect these signatures. Our results show that a good estimate of J_2 requires a good knowledge of Mars' rotation, that it is possible to decorrelate J_2 and all rotation parameters, LOD in particular, and that the wind contribution (5%) in seasonal variations of J_2 can be detected by simultaneous adjustment from NEIGE and DSN data.

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