Abstract:

In order to improve the robustness performance and enhance the large-space combat capability of the airborne time-sensitive guided bombs, a discretetime adaptive bank-to-turn (BTT) autopilot design method is proposed by combining a parameter estimation scheme with the discrete-time sliding mode control. The BTT control affine system containing parameter perturbation items is modeled. Meanwhile, aiming at the aerodynamic parameter symmetry and cross coupling characteristics, input-output feedback linearization is utilized to decouple the system, and a parametric discrete-time sliding mode control law is obtained. The parametric adaptation law designed based on Lyapunov stability theory can overcome the uncertain disturbances caused by aerodynamic coefficient deviation items effectively. The simulation results indicate that the adaptive discrete-time sliding mode BTT control system proposed is robust to the large-scale aerodynamic parametric uncertainty and has excellent dynamic tracking performance with no control chattering.