Time-Optimal Nonlinear Feedback Control for the NPSAT1 Spacecraft, IEEE-ASME (2005; Monterey, California)
Ross, I. Michael
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NPSAT1 is a small satellite being built at the Naval Postgraduate School, and due to launch in January 2006. It uses magnetic actuators and a pitch momentum wheel for attitude control. In this paper, a novel time-optimal sampled-data feedback control algorithm is introduced for closed-loop control of NPSAT1 in the presence of disturbances. The feedback law is not analytically explicit; rather, it is obtained by a rapid re-computation of the open-loop time-optimal control at each update instant. The implementation of the proposed controller is based on a shrinking horizon approach and does not require any advance knowledge of the computation time. The ground- test simulations show that the proposed control scheme performs well in the presence of parameter uncertainties and external disturbance torques.
The article of record as published may be located at http://ieeexplore.ieee.orgApproved for public display, distribution unlimitedProceedings of the 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics ; Monterey, California, USA, 24-28 July, 2005
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