In this paper, the distributed fixed-time attitude coordinated tracking control problem is investigated for multiple rigid spacecraft in the presence of external disturbances. A novel integral sliding mode control scheme is proposed for second order systems with external disturbances, which provides bounded convergence time independent of initial conditions. By constructing a sliding-mode estimator for each spacecraft, the requirement of the neighbours’ control input information is removed, which reduces the communication flow. A fixed-time disturbance observer is introduced to compensate external disturbances. Then, the composite attitude tracking control laws are developed to guarantee tracking errors converge to zero in fixed time. The fixed-time stability of the closed-loop system is proven by employing the Lyapunov method. Finally, the performance of the proposed control approach is illustrated by numerical simulations.

本文研究了存在外部干扰的多种刚性航天器的固定时间姿态协调跟踪控制问题。针对具有外部干扰的二阶系统，提出了一种新颖的积分滑模控制方案，该方案提供了与初始条件无关的有界收敛时间。通过为每个航天器构造一个滑模估计器，可以消除对邻居控制输入信息的要求，从而减少了通信量。引入了固定时间的干扰观测器以补偿外部干扰。然后，建立复合姿态跟踪控制律，以保证跟踪误差在固定时间内收敛到零。通过使用Lyapunov方法证明了闭环系统的固定时间稳定性。最后，