Browsing by Author "Arnold, D."
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Item Callisto and Europa: a simulation study for gravity field determination from orbit tracking data(2022-08-31) Desprats, W.; Arnold, D.; Bertone, Stefano; Blanc, M.; Jäggi, A.; Li, M.; Lei, L.; Witasse, O.Item Influence of Low Europa Orbit design on gravity field recoveryDesprats, W.; Bertone, S.; Arnold, D.; Jäggi, A.; Blanc, M.BORIS Bern Open Repository and Information SystemUniversity of BernHomeStatistics Influence of Low Europa Orbit design on gravity field recovery Desprats, W.; Bertone, S.; Arnold, D.; Jäggi, A.; Blanc, M. (2021). Influence of Low Europa Orbit design on gravity field recovery (Unpublished). In: Influence of Low Europa Orbit design on gravity field recovery. Sydney, Australia (online). Jan. 28 - Feb. 4, 2021. [img] Text PSD.1-0025-21_WILLIAMDESPRATSPOSTER.pdf - Presentation Available under License BORIS Standard License. Download (686kB) | Preview Official URL: https://www.cospar-assembly.org/admin/congress.php... The characterization of Europa's surface and interior ocean and ice shell is key to explore the habitability of the fourth largest moon of Jupiter. Europa Clipper will largely contribute to our knowledge of Europa with multiple dedicated flybys. However, global mapping can only be significantly improved by means of an orbiter with high inclination and low altitude, as it will be done in the case of Ganymede by JUICE. This was the strategy of several mission proposals (Joint Europa Mission, Jupiter Europa Orbiter, HADES). A specific difficulty in designing suitable orbits in the Jovian system is related to the orbit stability, which is highly impacted by the influence of Jupiter as a third body exerting strong perturbations on a Europa orbiter. This results in constraints for potential science orbits which would allow, e.g., for the determination of Europa's gravity field using radio tracking to the probe. In this presentation, we will analyze a set of different low Europa orbits and compare their scientific value for gravity field recovery. We will explore different orbital characteristics, with the possibility to use repetitive ground track orbits. The analysis will be performed based on closed-loop simulations using the planetary extension of the Bernese GNSS Software. We simulate realistic Doppler tracking data (2-way X-band Doppler range rate) from the Deep Space Network. These observations are then used to reconstruct the orbit as well as geodetic parameters, such as Europa gravity field parameters and the tidal Love number k2. We will discuss the quality of the retrieved solutions.Item LARES (LAser RElativity Satellite): Status Report(Instituto Nazionale di Fisica Nucleare, 2008-05-21) Boni, A.; Cantone, C.; Dell’Agnello, S.; Delle Monache, G. O.; Franceschi, M. A.; Garattini, M.; Intaglietta, N.; Lops, C.; Martini, M.; Maiello, M.; Prosperi, C.; Bellettini, G.; Tauraso, R.; March, R.; Ciufolini, I.; Berardi, S.; Cerruti, C.; Graziani, F.; Ialongo, P.; Lucantoni, A.; Paolozzi, A.; Peroni, I.; Paris, C.; Sindoni, G.; Vendittozzi, C.; Currie, D. G.; Arnold, D.; Rubincam, D. P.; Pavlis, Erricos C.; Matzner, R.; Slabinski, V. J.Item Laser geodetic satellites: a high-accuracy scientific tool(Springer Nature Switzerland AG., 2019-02-12) Pearlman, M.; Arnold, D.; Davis, M.; Barlier, F.; Biancale, R.; Vasiliev, V.; Ciufolini, I.; Paolozzi, A.; Pavlis, Erricos C.; Sośnica, K.; Bloßfeld, M.Satellite Laser Ranging (SLR) began in the mid-1960s on satellites of opportunity with retro-reflectors intended as a part of intercomparison tests of satellite tracking techniques. Shortly thereafter, data from these satellites began to work their way into geodetic solutions and dedicated geodesy experiments. By early 1970s when future requirements for centimeter accuracy were envisioned, planning began for dedicated, spherical retro-reflector geodetic satellites. Built with high mass-to-area ratios, these satellites would have important applications in gravity field modeling, station geolocation and fiducial reference systems, Earth rotation, and fundamental physics. Early geodetic satellites were Starlette, launched in 1975 by Centre National d’Etudes Spatiales (CNES), and LAGEOS in 1976 by the National Aeronautics and Space Administration (NASA). Recent geodetic satellites include LARES, launched in 2012, and LARES-2 under development, both by the Italian Space Agency (ASI). Today, a complex of these ‘geodetic satellites’ from low to high altitude Earth orbits supports many space geodesy requirements. This paper will discuss the evolution of the geodetic satellites from the early days, through current programs and out to future needs as we approach our goal for millimeter accuracy.