NONLINEAR FEEDBACK DEPLOYMENT AND RETRIEVAL OF TETHERED SATELLITE SYSTEMS
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The Lyapunov approach for controller design is applied to the tethered subsatellite deployment and retrieval problem. The tether dynamic model includes tether mass as well as in-plane and out-of-plane librations. The nonlinear feedback tension control law developed guarantees stability of the closed-loop system and is used in combination with out-of-plane thrusting during retrieval. Simulation results show the tension and the combined tension and thruster control laws perform well for deployment and retrieval, respectively, even when aerodynamic drag is considered. 1990 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.