中文摘要：

针对挠性卫星姿态系统,研究了基于区域极点配置的姿态镇定控制问题.通过对姿态系统进行近似线性化处理,并应用线性矩阵不等式（LMI）技术给出一种基于降维观测器的状态反馈控制方法.该方法根据分离原理,分别采用区域极点配置和极点配置定理设计控制器和观测器.对某挠性卫星模型进行数值仿真,并与一种非线性控制方法做比较研究.仿真结果表明该方法兼顾了卫星姿态系统的动态和稳态性能,且在小角度姿态镇定控制上具有显著优势.

英文摘要：

Based on regional-pole assignment, the attitude stabilization control problem is studied for the flexible satellite-attitude system.Through the approximate linearization of the attitude system and linear matrix inequality （LMI） technique, a state feedback control approach based on the reduced-order observer is provided.According to the separation principle, the controller and the observ- er are obtained by regional pole assignment and theorem of pole assignment, respectively.Finally, the method is validated over the nonlinear model of a flexible satellite.Simulation results show that, compared with a nonlinear control approach, the proposed method guarantees both dynamic and steady state performances of the satellite attitude system. Furthermore, the method enjoys significant advantages in small angle attitude stabilization control.