考虑模型参数不确定性的航天器姿态机动控制

摘要

针对具有参数不确定航天器大角度姿态机动的非线性控制问题，提出一种分散保性能控制律。研究刚性航天器大角度机动中航天器姿态控制问题时，忽略挠性模态对其的影响。在对具有参数不确定航天器进行建模的前提下，对模型的性质进行了描述。利用反馈线性化方法将航天器姿态动力学模型变换成三个部分进行分散控制器的综合，设计保性能控制律对航天器模型中参数不确定性进行抑制。由于引入保性能控制律，在补偿参数不确定性的同时还能够满足系统性能指标的要求。仿真实验结果表明，所设计的控制律能保证航天器在不确定性的影响下，精确完成大角度姿态机动，验证了方法的有效性。%In order to deal with the nonlinear control issue of spacecrafts with uncertain parameters in large angle attitude maneuver,a novel method based on decentralized guaranteed cost control was adopt-ed.As researching object is rigid spacecraft in large angle attitude maneuver,the effects of the flexible modes of the spacecraft was neglected.The spacecraft with uncertain parameter was modeled and the spacecraft attitude dynamic model was transformed into three parts to integrate decentralized controller by using feedback linearization method.Guaranteed cost control method was added to reduce the level of un-certainty and meet the requirement of the performance index.The simulation results show that the de-signed controller ensures that the spacecraft can complete large angle attitude maneuver accurately even under the effects of uncertainty.Therefore,the proposed controller is proved to be effective.