Predetermined time attitude tracking control for rigid spacecraft

The predetermined time attitude tracking control problem is addressed in this paper for rigid spacecraft subject to parameter uncertainty and external disturbance. A finite-time extended state observer is developed to tackle the influence generated by the parameter uncertainty and external disturbance. Then, a predetermined time controller based on the finite-time extended state observer is designed via applying the sliding mode control technique. By incorporating a novel time-varying sliding mode manifold, the proposed controller can guarantee that the tracking errors of the control system converge to the region of the origin at an arbitrary predetermined time. Finally, the attitude tracking performance of the proposed controller is demonstrated by numerical simulations.