Output Feedback Robust H-Infinite Autopilot of BTT Missile based on Linear Matrix Inequality

Aiming at the control problem of the non-linear BTT missile, this paper adopts the output feedback robust H-Infinite control theory based on the linear matrix inequality method to design its autopilot. First the theory of output feedback robust H-Infinite control based on the linear matrix inequality method is introduced. Then taking the pitch channel of BTT missile as an example, the state space equation with unmeasured states is obtained by considering the series system of actuator and missile body pitching movement. The appropriate outputs are selected according to the measurable quantities and autopilot design purpose and the model is further rewritten into the standard H-Infinite control form in order to design the output feedback robust H-Infinite control autopilot. Finally, the control performance and robustness of the designed controller are verified by simulation.