Nonlinear Flight Control System Design of Bank-to-Turn Unmanned Aerial Vehicle

A method of designing a bank-to-turn(BTT) flight control system of unmanned aerial vehicle(UAV) was studied to solve the problems cause by kinematics coupling,aerodynamic nonlinearity and parameter uncertainty.The zero dynamic system of nonlinear motion of BTT was adjusted for stability augmentation by the quadratic optimum adjustment law;the nonlinear system of BTT was processed linearly by the precision feedback linearization method;the control law of BTT was designed by a sliding mode variable structure control method to obtain the BTT flight control system with nonlinearity and robustness.The performance of the control system was analyzed by the digital simulation based on UAV six-freedom nonlinearly dynamic and kinematic model.The simulated results show that the control system can meet the needs of accuracy and robustness under the condition of perturbation.