基于变增益观测器的高超声速飞行器输出反馈控制

针对吸气式高超声速飞行器飞行控制问题，提出一种基于变增益观测器的双回路非线性输出反馈控制方案。首先，为解决部分状态信号不可直接测量的问题，设计了一种可变增益状态观测器。通过状态变换将飞行器模型变换为双回路形式，并设计自适应的观测器增益系数在保证其稳定性的同时提高鲁棒性。在此基础上，将高超声速飞行器本体模型与所设计的观测器一起构成新的严反馈系统，结合反步法与动态面设计控制器。另外，引入扩张状态观测器补偿系统观测误差及耦合项。利用Lyapunov理论证明了闭环系统的一致有界稳定。最后，在不同情况下的数值仿真校验了所提控制方案在存在较大参数不确定情况下可获得理想的指令跟踪效果。

Variable Gain Observer Based Output Feedback Control for Hypersonic Vehicles

Aiming at the flight control problem of the air-breathing hypersonic vehicles, a variable gain observer based double-loop nonlinear feedback control scheme is proposed. Firstly, to obtain the unmeasurable state signals, a variable gain observer is designed. The model of the hypersonic vehicle is rewritten as the double-loop form by state transition. The adaptive observer gain is designed to ensure the stability and improve the robustness. On this basis, the hypersonic vehicle model is combined with the designed observer to construct a new strict feedback system. The backstepping method and dynamic surface method are used to design the controller. In addition, an extended state observer is involved to compensate the observation error and coupling term. The Lyapunov theory is used to prove the uniform bounded stability of the closed-loop system. Finally, through the numerical simulations, it is verified that the proposed control scheme can obtain the ideal command tracking in the presence of the large parameter uncertainties.