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把风干扰和系统摄动作为不确定因素，用不确定性系统变结构控制理论设计飞机的航迹控制律，使之对风干扰和系统摄动进行完全抑制。给出了受风切变干扰后系统的不确定性模型，推导出了飞机对风切变及系统内部不确定因素的不变性条件，最后设计变结构控制系统的滑动超平面和控制规律，并以ＣＩＴＡＴＩＯＮＩ飞机穿越一风暴区着陆为例，进行仿真计算，结果表明，所设计的控制规律效果很好。
Taking wind disturbance and system perturbation as uncertain factors, the variable-structure control theory of uncertain system is used to design the trajectory control law of the airplane so as to completely restrain the wind disturbance and system perturbation. The uncertainty model of the system subjected to wind shear is given. The invariance conditions of wind shear and uncertainties in the system are deduced. Finally, the sliding hyperplane and control law of the variable structure control system are designed. Taking CITATIONI landing across a storm area as an example, the simulation results show that the designed control law works well.