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.

研究了受参数不确定和外部干扰影响的刚性航天器的预定时间姿态跟踪控制问题。开发了一种有限时间扩展状态观测器来解决参数不确定性和外部干扰所产生的影响。然后，应用滑模控制技术，设计了基于有限时间扩展状态观测器的预定时间控制器。通过结合一种新颖的时变滑模流形，所提出的控制器可以保证控制系统的跟踪误差在任意预定时间收敛到原点区域。最后，通过数值模拟证明了所提出控制器的姿态跟踪性能。