将下面的话翻译为英语：首先将飞机非线性模型的不确定性和外部干扰统一建模为复合干扰然后利用设计的新型干扰观测器对未知复合干扰在线估计和补偿并结合改进的动态面控制方法设计了超机动飞行控制器最后采用Lyapunov稳定性理论分析了系统的稳定性。仿真结果表明干扰观测器能有效改善控制精度在气动参数摄动且存在不可导外部干扰的情况下所设计的控制器仍能有效跟踪参考信号具有良好的鲁棒性。

Firstly, the uncertainty and external disturbances of the nonlinear model of the aircraft are unifiedly modeled as compound disturbances. Then, a novel disturbance observer is designed to estimate and compensate for unknown compound disturbances online, and an improved dynamic surface control method is used to design a highly maneuverable flight controller. Finally, the stability of the system is analyzed using the Lyapunov stability theory. Simulation results show that the disturbance observer can effectively improve control accuracy. Even in the presence of aerodynamic parameter perturbations and non-differentiable external disturbances, the designed controller can still effectively track the reference signal and exhibit good robustness