Longitudinal Control of Morphing Aircraft Based on Fixed Time Constraint Backstepping Method

In this paper, a fixed-time controller is proposed in view of the characteristics of force and moment changes of the variable sweep aircraft during the morphing process. The characteristic of the controller is that it can ensure that the stability of the system in a fixed time, and can estimate the aerodynamic derivatives of the variable sweep through the least squares estimation method. In addition, according to the characteristics that the controller easily leads to system input saturation, a processing method of constraint control is proposed to ensure the stability of the system under the condition of limited input. Finally, the variable-sweep-wing aircraft is used to simulate the angle of attack and pitch angular velocity, and the simulation results verify the effectiveness of the control law.