Abstract:

A backstepping global sliding mode control scheme based on nonlinear disturbance observer is proposed for flight attitude tracking control system of 3th generation fighter with uncertainties and hysteretic nonlinearity actuators. The nonlinear disturbance observers are used to observe the uncertainties and the nonlinear part of the hysteretic without the restrictive condition that the disturbances to be observed must be slowly time varying. The first order filter is introduced from dynamic surface control to reduce complexity of the backstepping controller. It can be ensured theoretically by Lyapunov function that closed loop system is stable. Simulation results show the proposed control system deals with the problems of uncertain factors preferably and realizes robust output tracking for guidance orders.