自适应时变滑模再入姿态控制设计

摘要

为了提高再入控制鲁棒性和适应性,结合高阶滑模观测器提出一种基于反馈线性化的时变滑模控制方法.首先,根据时变滑模面推导出控制律,引入了自适应算法获得控制律中的切换增益,消除了对系统不确定性上界已知这一条件的依赖;其次,利用高阶滑模观测器对姿态角导数信息进行观测,同时获得系统扰动估计值,消除了控制器对较难直接测量的姿态角导数信息的依赖.最后,通过数值算例验证了所提控制方法的有效性.%To improve system's robustness and the adaptability of entry control,a time-varying sliding mode control method based on feedback linearization is introduced.According to the time-varying sliding mode surface,the control algorithm is proved.To avoid the dependence on uncertain upper boundary,the control gain is switched by the self-adaptive algorithm.The derivative information of attitude angle and estimated value of system disturbances are acquired by utilizing the high-order sliding mode observer.The control algorithm is proved satisfactory performance by analyzing simulation examples.