Tian Ye, Du Changkun, Lu Pingli, Jiang Qing, Liu Haikuo
School of Automation, Beijing Institute of Technology, Beijing 100081, PR China.
School of Automation, Beijing Institute of Technology, Beijing 100081, PR China.
ISA Trans. 2022 Oct;129(Pt B):243-256. doi: 10.1016/j.isatra.2022.02.024. Epub 2022 Feb 21.
This paper investigates the problem of fixed-time attitude coordinated control for multi-spacecraft systems with unknown external disturbance. Firstly, a distributed fixed-time observer is introduced to estimate the states of the virtual leader. The observer can track the leader completely in a fixed time without dependence on the initial conditions of the leader and observer. Then, we propose a novel nonsingular fixed-time sliding mode tracking controller to address the fixed-time attitude tracking problem. It is noteworthy that the requirement on initial conditions of spacecraft is removed in the proposed nonsingular sliding mode controller. Due to the robustness of sliding mode control, the influence of external disturbance can be eliminated, such that each spacecraft can track desired attitude trajectories precisely in a fixed time. Hence, the fixed-time attitude coordination for multiple spacecraft can be achieved. Finally, numerical simulation results and comparisons reveal the effectiveness of the proposed algorithms.
本文研究了具有未知外部干扰的多航天器系统的固定时间姿态协同控制问题。首先，引入了一种分布式固定时间观测器来估计虚拟领导者的状态。该观测器能够在固定时间内完全跟踪领导者，且不依赖于领导者和观测器的初始条件。然后，我们提出了一种新颖的非奇异固定时间滑模跟踪控制器来解决固定时间姿态跟踪问题。值得注意的是，在所提出的非奇异滑模控制器中，消除了对航天器初始条件的要求。由于滑模控制的鲁棒性，可以消除外部干扰的影响，使得每个航天器能够在固定时间内精确跟踪期望的姿态轨迹。因此，可以实现多个航天器的固定时间姿态协同。最后，数值仿真结果和比较验证了所提算法的有效性。
