Robust Autopilot Desigh Of BTT Missile Based On Composite Switching

The research of Bank-To-Turn missile control technology is very important both in theoretical and practical area on the developing of missile system, which is commanded to have the long-range, high-speed, high-precision and high-maneuver capability. The characters of BTT missile control system determine that its mathematics model is a multi-variables system with multi-coupling. So the design of BTT missile's autopilot has become the key part of its research.In this paper, multi-model is applied to solve the parameters'uncertainty in the whole flight trajectory. 7 characteristic operating point are selected and the time-invariant subsystems around them are set up. On each point, the eigenstruc-ture assignment method and the model-following method are employed to design the feedback controller and the feedforward controller. The parameters are acquired by optimizing the target function which characterizes the robust stability of the system. So the controllers can guarantee both the robust stability and other performance of the system while the output are following the input instructions.A composite control is proposed to reduce the inevitable chattering in the switching process between two different models. Linear and fuzzy control are combined in this method improved on the base of fuzzy-PID theory and the MIMO fuzzy control theory. The error signal is employed to schedule the weights of linear and fuzzy control in the purpose of obtaining a smooth changing of the controller and a smaller chattering caused by the model switching.The composite theory proposed in this paper combines the intelligent control and the modern control. Simulation results demonstrate the robust stability of the sub-controller and the chattering-restrained of the switching-controller.