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The accuracy of orbit determination has a strong impact on the scientificoutput of the Space VLBI mission RadioAstron. The aim of this work is toimprove the RadioAstron orbit reconstruction by means of sophisticateddynamical modelling of its motion in combination with multi-station Dopplertracking of the RadioAstron spacecraft. The improved orbital solution isdemonstrated using Doppler measurements of the RadioAstron downlink signal andby correlating VLBI observations made by RadioAstron with ground-basedtelescopes using the enhanced orbit determination data. Orbit determinationaccuracy has been significantly improved from ~ 600 m in 3D position and ~ 2cm/s in 3D velocity to several tens of metres and mm/s, respectively.

RadioAstron as a target and as an instrument: Enhancing the Space VLBI mission's scientific output