000004587 001__ 4587
000004587 005__ 20200121160914.0
000004587 0247_ $$2DOI$$adoi.org/10.1016/j.pss.2019.104776
000004587 037__ $$aSCART-2020-0027
000004587 100__ $$aDehant, V.
000004587 245__ $$aThe radioscience LaRa instrument onboard ExoMars 2020 to investigate the rotation and interior of Mars
000004587 260__ $$c2020
000004587 520__ $$aLaRa (Lander Radioscience) is an experiment on the ExoMars 2020 mission that uses the Doppler shift on the radio link due to the motion of the ExoMars platform tied to the surface of Mars with respect to the Earth ground stations (e.g. the deep space network stations of NASA), in order to precisely measure the relative velocity of the lander on Mars with respect to the Earth. The LaRa measurements shall improve the understanding of the structure and processes in the deep interior of Mars by obtaining the rotation and orientation of Mars with a better precision compared to the previous missions.  In this paper, we provide the analysis done until now for the best realization of these objectives. We explain the geophysical observation that will be reached with LaRa (Length-of-day variations, precession, nutation, and possibly polar motion). We develop the experiment set up, which includes the ground stations on Earth (so-called ground segment). We describe the instrument, i.e. the transponder and its three antennas. We further detail the link budget and the expected noise level that will be reached. Finally, we detail the expected results, which encompasses the explanation of how we shall determine Mars' orientation parameters, and the way we shall deduce Mars' interior structure and Mars’ atmosphere from them. Lastly, we explain briefly how we will be able to determine the Surface platform position.
000004587 536__ $$aPRODEX/$$cPRODEX/$$fPRODEX
000004587 594__ $$aNO
000004587 700__ $$aLe Maistre, S.
000004587 700__ $$aBaland, R.M.
000004587 700__ $$aBergeot, N.
000004587 700__ $$aKaratekin, O.
000004587 700__ $$aPeters, M.J.
000004587 700__ $$aRivoldini, A.
000004587 700__ $$aRuiz Lozano, L.
000004587 700__ $$aTemel, O.
000004587 700__ $$aVan Hoolst, T.
000004587 700__ $$aYseboodt, M.
000004587 700__ $$aMitrovic, M.
000004587 700__ $$aKosov, A.
000004587 700__ $$aValenta, V.
000004587 700__ $$aThomassen, L.
000004587 700__ $$aKarki, S.
000004587 700__ $$aAl Khalifeh, K.
000004587 700__ $$aCraeye, C.
000004587 700__ $$aGurvits, L.
000004587 700__ $$aMarty, J.C.
000004587 700__ $$aAsmar, S.
000004587 700__ $$aFolkner, W.
000004587 700__ $$aLaRa Team, and the
000004587 773__ $$c104776$$pPlanetary and Space Science$$v180$$y2020
000004587 8560_ $$fmarie.yseboodt@observatoire.be
000004587 85642 $$ahttps://doi.org/10.1016/j.pss.2019.104776
000004587 85642 $$ahttps://arxiv.org/abs/1910.03899
000004587 8564_ $$s4596046$$uhttp://publi2-as.oma.be/record/4587/files/Dehant20.pss180.larapaper.pdf
000004587 8564_ $$s5626336$$uhttp://publi2-as.oma.be/record/4587/files/Dehant20.LaRapaper_arxivsubmission.pdf
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000004587 905__ $$apublished in
000004587 980__ $$aREFERD