高超声速飞行器自适应抗饱和再入控制

高超声速飞行器（Hypersonic vehicle，HSV）再入过程中易发生舵面饱和现象，并且其动力学模型具有强烈不确定的特征，这导致其姿态控制系统的设计极富挑战性。针对舵面受限的非线性控制问题，提出外部Anti windup系统结合二阶Terminal滑模控制律的设计方法，能够实现对气动舵面饱和的控制补偿，使HSV快速平稳地跟踪指令信号。其次，针对HSV的强不确定控制问题，提出自适应滑模干扰观测器（Adaptive sliding mode disturbance observer,ASMDO）的方法来对再入气动参数不确定及强外界干扰进行估计，此方法无需干扰界已知且学习参数少，适合实时控制。最后, 再入姿态控制的仿真结果表明了该控制方法的有效性和强鲁棒性。

Adaptive Reentry Control for Hypersonic Vehicles with Saturation

The saturation of control surfaces is more likely to occur for the hypersonic vehicle (HSV) during reentry, and the dynamic model of HSV possesses the feature of strong uncertainty. Both problems make the design of reentry attitude controller a challenging task. The method of external anti-windup system combined with the second-order terminal sliding mode control law is presented for the nonlinear control problem of the restriction of control surfaces. It can realize the compensation for the control surface saturation and let HSV smoothly track the command signals. Then, the adaptive sliding mode disturbance observer (ASMDO) is proposed to estimate aerodynamic parameter uncertainties and strong external disturbances for strong uncertainty. This method does not need the information of disturbance bounds and has fewer learning parameters, so it is suitable for the real-time control. Finally, the simulation of attitude control for the reentry HSV is conducted, and the results show the effectiveness and robustness of this scheme.