Design of Optimal-Sliding Mode Nonlinear Autopilot for BTT Missile

Aiming at Bank-To-Turn (BTT) missile flight control problem,a θ-D scheme based optimal sliding mode controller design method for a nonlinear autopilot was developed. The dynamic of missile was transformed to a cascade or two-loop structure,the outer loop was designed using a θ-Dmethod based optimal controller. This outer loop controller generates an optimal sliding surface which is followed by a sliding mode controller in the inner loop. Simulation and analysis was performed for the nonlinear control system. Results demonstrate that the designed autopilot is provided with higher precision and better robustness in the entire missile flight envelope.