Joint estimation of Martian \bar{C}20 and rotation variations from simultaneous geodetic measurements: Numerical simulations of a Network Science Experiment

Details Joint estimation of Martian \bar{C}20 and rotation variations from simultaneous geodetic measurements: Numerical simulations of a Network Science Experiment Joint estimation of Martian \bar{C}20 and rotation variations from simultaneous geodetic measurements: Numerical simulations of a Network Science Experiment

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30rpla3d&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. PLA 3-1, CiteID 1971, DOI 10.1029/2003GL018353

Physics

2

Geodesy And Gravity: Planetary Geodesy And Gravity (5420, 5714, 6019), Planetary Sciences: Orbital And Rotational Dynamics, Planetology: Solar System Objects: Mars

Scientific paper

The Martian global-scale CO2 seasonal cycle implies temporal variations in both the zonal gravity coefficients, such as $\bar{C}$20, and in the rotation rate. To estimate the ability to detect simultaneously these two main geodetic signatures, a new approach based on a Network Science Experiment is investigated. We have numerically simulated the two types of Doppler signals involved, accurate orbiter tracking from the Earth and Martian lander tracking from the orbiter, by using a model of both the rotation variations and the seasonal variations of $\bar{C}$20. Then, through a least square process, we have jointly adjusted the rotation and $\bar{C}$20 parameters from an a priori knowledge. Our results show that it is possible to decorrelate $\bar{C}$20 from all rotation parameters. We obtain an accurate adjustment of the $\bar{C}$20 variations and a precision at the level of a few milliarcseconds for the estimation of the rotation rate variations.

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