Decoupled Control System Design for BTT Missile with Coupled Channels Based on Variable Control Theory

The traditional three-channel-design-independently design method is not suitable for BTT missile,whose high roll rate combined with an asymmetrical aerodynamic structure will cause severe undesirable coupling between roll,pitch and yaw channels.By using the variable structure control theory,a new independent design method is proposed here,in which all the coupling factors among the channels are reserved during the design course and regarded as the disturbances.Based on the method,the control laws of the craft's coupled channel are designed and the determination criterion of sliding mode parameters are also studied.Application in some BTT missile autopilot design shows that the decoupled controller is robust and has fast response time,high accuracy.