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GR: Fachverband Gravitation und Relativitätstheorie

GR 5: Experimente

GR 5.6: Vortrag

Dienstag, 26. Februar 2013, 17:45–18:00, HS 6

The impact of high precision modeling of non-gravitational forces on the accuracy of gravitational measurements in space — •Benny Rievers, Meike List, Stefanie Bremer, and Claus Lämmerzahl — ZARM, Universität Bremen

The requirements on the knowledge of the perturbations acting on measurement systems in space are increasing constantly. Motivated by this, the Center of Applied Space Technology and Microgravity (ZARM) is developing improved modeling methods for the evaluation and prediction of these effects. For current missions like GRACE, these high precision perturbation models can be used to improve measured data by a better understanding of the sources of the perturbed measurements. For future mission concepts like LISA or GRACE-FO, the same models can be used for an optimization of mission and spacecraft design (with respect to the perturbations) as well as for the generation of mock data, which is needed to qualify the data evaluation techniques used during the respective mission. The importance of the implementation of accurate non-gravitational forces modeling has been demonstrated by ZARM with the interpretation of the Pioneer anomaly as a thermal drag as well as the explanation of anomalous drag effects for the Rosetta mission. In this talk the involved methods will be discussed in detail. Furthermore first results of the evaluation of the dominant non-gravitational forces acting on LISA and the NASA Messenger mission will be shown.