【摘要】 研究了对地观测卫星的非线性姿态控制方法。建立了对地观测卫星基于四元数的误差姿态运动学方程和姿态动力学方程。设计滑模变量,用滑模变结构控制保证系统的稳定性和对强干扰的鲁棒性,用自适应模糊系统消除滑模控制中固有的控制变量抖振。用非自治系统的Lyapunov稳定性理论分析证明了设计的闭环系统为一致渐进稳定。数值仿真结果表明:设计的控制方法在大角度姿态随动和受较大时变干扰力矩作用时均有良好的控制效果。更多还原

【Abstract】 The nonlinear attitude control of an earth observation satellite was studied in this paper.The error kinematics based on quaternion and dynamics were established for the earth observation satellite.The sliding surface,based the idea of variable structure control with sliding surface,was designed for ensuring system stability and robust for strong disturbance.The adaptive fuzzy system was applied for eliminating the chattering of the state variables caused by the sliding surface control.The stability of the closed loop system with the designed control method was proved to be uniformly gradually stable by Lyapunov theory.The simulation results showed that the designed control method would have a nicer effect for two instances of the attitude following and disturbed by great time-varying moment.更多还原