Bernd Dachwald, Volodymyr Baturkin, Victoria Coverstone, Benjamin Diedrich, Gregory Garbe, Marianne Görlich, Manfred Leipold, Franz Lura, Malcolm Macdonald, Colin McInnes, Giovanni Mengali, Alessandro Quarta, Leonel Rios-Reyes, Daniel Scheeres, Wolfgang Seboldt, Bong Wie
Potential Effects of Optical Solar Sail Degradation on Interplanetary Trajectory Design
In: Advances in the Astronautical Sciences, Vol. 123: Astrodynamics 2005 – Part III (Proceedings of the AAS/AIAA Astrodynamics Conference 2005, Lake Tahoe (CA), USA) Univelt, San Diego, pp. 2569-2592 (AAS 05-413)


Abstract

The optical properties of the thin metalized polymer films that are projected for solar sails are assumed to be affected by the erosive effects of the space environment. Their degradation behavior in the real space environment, however, is to a considerable degree indefinite, because initial ground test results are controversial and relevant in-space tests have not been made so far. The standard optical solar sail models that are currently used for trajectory design do not take optical degradation into account, hence its potential effects on trajectory design have not been investigated so far. Nevertheless, optical degradation is important for high-fidelity solar sail mission design, because it decreases both the magnitude of the solar radiation pressure force acting on the sail and also the sail control authority. Therefore, we propose a simple parametric optical solar sail degradation model that describes the variation of the sail film's optical coefficients with time, depending on the sail film's environmental history, i.e., the radiation dose. The primary intention of our model is not to describe the exact behavior of specific film-coating combinations in the real space environment, but to provide a more general parametric framework for describing the general optical degradation behavior of solar sails. Using our model, the effects of different optical degradation behaviors on trajectory design are investigated for various exemplary missions.

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