Fuzzy Flight Control for Small Fixed-Wing UAV Rolling Takeoff in Presence of Strong Disturbance

A novel rolling takeoff scheme for small fixed- wing unmanned aerial vehicle(UAV) based on fuzzy control is presented in this paper. According to the analysis of the disturbance and control ability of UAV, the disturbance torque in rolling channel which caused by the propeller is larger than the control ability of aileron during the initial takeoff phase. To overcome the conflict between the disturbance and the control ability, the disturbance torque is treated as a part of control input to control the UAV make a quasi-barrel-roll in initial phase. With the increasing of velocity and control ability of UAV, the disturbance torque is compensated by the control torque such that the roll angle can be stabilized quickly. Based on aforementioned control strategy, the fuzzy control method is adopted to design the flight control scheme, and the frequency response of the proposed control scheme is presented. Numerical simulation results are carried out to verify the effectiveness of the proposed flight control scheme.