滑模观测器在卫星姿控系统故障诊断中的应用

吴丽娜, 张迎春, 赵石磊, 陈雪芹

哈尔滨工业大学卫星技术研究所



摘要:

为提高卫星系统的可靠性,研究了基于观测器的卫星姿态控制系统执行机构故障诊断问题.考虑卫星姿态控制系统的不确定性及外界干扰,设计一种鲁棒自适应滑模观测器,采用Lyapunov函数作为稳定观测器的判别条件,保证了观测器的存在,利用设计的观测器对执行机构的故障进行重构从而达到故障诊断的目的.建立卫星闭环姿态控制系统模型并对算法进行数学仿真,仿真结果验证了方法的有效性.

关键词:  自适应  滑模观测器  鲁棒性  故障诊断  卫星姿态控制

DOI：10.11918/j.issn.0367-6234.2011.09.003

分类号:V448.22

基金项目:中国博士后科学基金资助项目(20090450126)



Sliding mode observer used in satellite attitude control system fault diagnosis

WU Li-na, ZHANG Ying-chun, ZHAO Shi-lei, CHEN Xue-qin

Research Center of Satellite Technology,Harbin Institute of Technology,150001 Harbin,China

Abstract:

To improve the reliability of satellite system,the observer-based actuator fault diagnosis problem for satellite attitude control system was investigated.Considering the uncertainty and disturbance of the satellite attitude control system,a robust adaptive sliding mode observer was proposed.A Lyapunov function was given as the judgment condition to stabilize the observer.Then,the proposed observer was used for actuator fault reconstruction.At last,the simulation of the observer in a satellite attitude control system with actuator fault illustrates the effectiveness of the proposed approach.

Key words:  adaptive  sliding mode observer  robustness  fault diagnosis  satellite attitude control system