Active disturbance rejection station-keeping control for solar-sail libration-point orbits

A station-keeping control method for a reflectivity modulated solar sail around the sun?Earth/moon L1 libration point is proposed. The required controller is developed based on an active disturbance rejection control (ADRC) technique. The attractiveness of the controller results from its computational simplicity and inherent robustness. High-precision station keeping is achieved by varying the pitch angle, the clock angle, and the reflectivity rate of the sail. The results indicate that a relatively small portion of the sail area (about 6%) needs to be equipped with the reflectivity control device (RCDs) to maintain the solar sail on a particular Lissajous orbit and Halo orbit.