再入飞行器带有干扰观测器的有限时间控制

摘要

针对模型参数不确定及外界干扰影响下的再入飞行器的姿态控制问题，设计基于干扰观测器的有限时间控制策略。首先建立面向控制模型，并通过多时间尺度原理将面向控制模型分为内、外两环；其次，设计干扰观测器实时观测面向控制模型中的参数不确定及外界干扰，解决滑模控制因参数过大而导致的抖振问题，基于观测值，设计终端滑模控制器，在此基础上，基于Lyapunov理论对控制系统的稳定性进行分析；最后，基于六自由度再入模型，验证所设计的有限时间姿态控制策略的有效性。%The finite time attitude tracking control problem is investigated based on disturbance observer for the reentry hypersonic vehicles with bounded external disturbances and model uncertainties. Firstly, the attitude model is divided into a two-loop structure based on the multiple time scale technique, and then terminal sliding mode controllers are designed for each loop. Secondly, disturbance observer is designed to estimate external disturbances and uncertainties, and the chattering caused by the big controller parameters of the sliding mode control can be eliminated. Stability is presented on the basis of Lyapunov analysis. Finally, simulation is carried out to demonstrate the effectiveness of the proposed controller for the 6-DOF reentry model.