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Solar sail missions will be designed for speciOc propulsion models of a sail, however due to uncertainties in sail performance and degradation these models must always be conservative and provide excess thrust. It is not simple to shed excess thrust on a solar sail, and it may not be feasible or wise to continually re-optimize and re-target the trajectory based on the current performance of the sail. We present an alternate control methodology that dumps excess thrust by forcing the sail to \orbit" about the nominal solution in a quasi-circular motion constrained to lie in the plane perpendicular to the nominal thrust direction. The excess thrust is balanced by the centripetal acceleration necessary to maintain the motion. A feedback control scheme can be used to asymptotically stabilize this orbital motion and an estimation strategy to track changing sail performance parameters. Implementation strategies for this approach are also discussed.

Robust Solar Sail Trajectory Control for Large Pre-Launch Modeling Errors