基于滑模干扰观测器的歼击机超机动飞行控制

摘要

针对非线性系统存在建模误差和外界干扰等不确定因素问题，提出一种基于滑模干扰观测器在线补偿的非线性动态逆控制方法。通过设计滑模干扰观测器，对不确定因素进行估计，将滑模干扰观测器的输出用以设计新的补偿控制律，与动态逆方法相结合来消除不确定因素的影响。以Herbst机动过程为例进行飞行仿真，并与单纯采用非线性动态逆方法的控制性能进行对比。仿真表明，系统能较好地跟踪姿态角指令，有良好的鲁棒性。%Considering the uncertain factors as modeling errors and external disturbances existed in nonlinear systems,a Nonlinear Dynamic Inversion ( NDI ) control method was proposed based on Sliding Mode Disturbance Observer ( SMDO ) on-line compensation.The SMDO was designed for estimating the uncertain factors,and the output of it was used to design a new compensating control law,which was used together with NDI control for eliminating the influence of the uncertain factors.The simulation experiment based on Herbst maneuver is given to show the difference between the simplex NDI control and the proposed method.The simulation results show the effectiveness and robustness of the proposed method.