In this article, a novel distributed attitude coordination control scheme is proposed for a group of rigid spacecraft with unknown disturbances. The communication topology is described by a general directed graph, and the leader's attitude is available to only a small fraction of followers. Different from existing attitude coordination control schemes, here an event-triggered communication strategy without Zeno phenomenon is designed, which avoids continuous communication between neighboring spacecraft and considerably reduces the communication burden. Moreover, a nonlinear observer is constructed for each follower, which enables us to estimate and compensate for a large class of disturbances exactly. The proposed scheme is able to ensure the boundedness of all closed-loop signals and steer the attitude tracking errors into an arbitrarily small residual set, regardless of the intermittent communication. Simulation results illustrate the effectiveness of the proposed scheme.

中文翻译：

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具有干扰和事件触发通信的航天器姿态协调控制

本文针对扰动未知的一组刚性航天器，提出了一种新颖的分布式姿态协调控制方案。通信拓扑由通用的有向图描述，并且领导者的态度仅对一小部分跟随者可用。与现有的姿态协调控制方案不同，这里设计了一种无芝诺现象的事件触发通信策略，避免了相邻航天器之间的连续通信，大大减轻了通信负担。此外，为每个跟随器构造了一个非线性观测器，这使我们能够准确估计和补偿一大类干扰。所提出的方案能够确保所有闭环信号的有界性，并且将姿态跟踪误差引导到任意小的残差集，而与间歇性通信无关。仿真结果说明了该方案的有效性。