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飞机低空突防作地形跟踪／回避飞行时，会出现纵向和横向运动的非线性交叉耦合，利用非线性逆系统理论和现代最优控制理论可以设计一个飞行控制规律来解开这些耦合．主要讨论了这种非线性解耦控制系统的混合仿真，给出了用于仿真的数学模型以及仿真方法；对系统有无大气紊流扰动的解耦控制、系统对指令输入的跟踪、飞行品质等方面进行了探讨．结果表明，该控制规津在有无大气紊流影响时都能实现解耦，准确地跟踪期望的三维突防航迹，并具有良好的乘座品质，减轻了驾驶员的负担．
The non-linear cross-coupling of longitudinal and lateral motion occurs when the aircraft makes a low-altitude collision avoidance for terrain following / avoidance flight. A non-linear inverse system theory and modern optimal control theory can be used to design a flight control law to solve these couplings. The hybrid simulation of the nonlinear decoupling control system is mainly discussed. The mathematical model and simulation method for the simulation are given. The decoupling control of the system for the presence of atmospheric turbulence disturbance, the tracking of the command input, the flight quality And other aspects were discussed. The results show that the control system can be decoupled in the presence of atmospheric turbulence, accurately track the desired three-dimensional pedestrian trajectory, and has good ride quality, reducing the burden on the driver.