航天器集群协同目标伴飞分布式控制

Distributed Control for Coordinated Target Surrounding Flying of a Cluster of Spacecraft

研究航天器集群协同目标伴飞问题,提出一种分布式自适应控制策略,使得每个跟随航天器在相对于目标航天器的指定位置与其保持相对静止状态。首先,为解决目标的运动信息只对于部分航天器已知且目标的加速度不可测量的问题,设计了分布式姿态和位置观测器;然后,将观测值作为每个跟随航天器的期望轨迹,设计了一种不依赖惯性参数的自适应控制策略。稳定性分析证明所提出的分布式自适应控制策略保证了受控闭环系统是一致渐近稳定的。最后,仿真算例验证了该控制策略的有效性。

A distributed adaptive control strategy is proposed for coordinated target surrounding flying of a cluster of spacecraft such that each follower spacecraft is driven to a given offset with respect to the target while remaining relatively static with it. Since only a subset of followers have the access to target’s information and the target’s accelerations are not available to any follower, distributed attitude and position estimators are designed. By using the estimated target’s information as the desired trajectories, an adaptive control strategy that does not depend on inertial parameters is designed for each follower spacecraft. Stability analysis proves that the proposed distributed adaptive control strategy ensures that the closed-loop system is asymptotically stable. Finally, the simulation examples are given to verify the effectiveness of the proposed control strategy.