航天器有限时间输出反馈姿态控制

 研究在角速度不可测时航天器的有限时间姿态控制问题。基于有限时间控制技术,提出了由修正Rodrigues参数进行姿态描述的航天器输出反馈姿态控制算法。首先设计了单个航天器的输出反馈姿态控制器,在没有角速度反馈时也能够保证航天器姿态在有限时间内调节到期望姿态。之后,设计了无需绝对角速度和相对角速度信息的多航天器分布式输出反馈姿态控制器。使用Lyapunov理论和图论,对闭环系统全局有限时间稳定性进行了严格的证明。最后对提出的控制算法进行了数值仿真,其结果验证了所设计的航天器输出反馈控制算法的可行性和有效性。

Finite-time Output Feedback Attitude Control of Spacecraft

This paper discusses the finite-time attitude control problem for spacecraft without angular velocity measurements. Based on the finite-time control technique, output feedback attitude control algorithms are proposed for spacecraft with attitudes represented by the modified Rodrigues parameter. First, an output feedback attitude controller of a single spacecraft is proposed, which guarantees the finite-time reachability of the given desired attitude of a rigid spacecraft without angular velocity feedback. Secondly, a distributed output feedback coordinated attitude controller for multiple spacecraft is proposed without the requirement of absolute angular velocities and relative angular velocities, which guarantees the coordinated attitude regulation in finite time. Rigorous proof is given by using the Lyapunov theory and graph theory. Finally, numerical simulation and verification are performed for the proposed control schemes. The results show that the proposed output feedback attitude control algorithms are feasible and effective.