Of Btt Missiles Robust H_ ¡Þ Autopilot Design

Bank-To-Turn (BTT) control technology is a new missile's control technology. It has very important theoretical and practical value on the developing of missile system, which has the long-range, high-speed, high-precision and high-maneuver capability. The characters of Bank-To-Turn control technology determine that the BTT missile's mathematical model having kinematical coupling, aero dynamical coupling, inertial coupling and control coupling. So the widely used STT missile's autopilot, which is designed to be three-channel independent can't meet the BTT missile's control need. And the traditional designed autopilot has poor robustness, so it should shift the autopilot's gain for the BTT missile flying stably along the whole trajectory. If we wish the BTT missile fly stably and accurately along the whole trajectory with the autopilot designed on a special state point, we need to apply the multiple-variable robust design method to design the BTT missile's autopilot.This thesis applies the robust H control theory to designing a BTT missile's autopilot. This design method overcomes the traditional autopilot's disadvantage that should shift the autopilot's gain according to flight phase; it also can make the BTT missile fly stably along the whole trajectory, and can intercept a maneuvering target accurately. The main research works of this thesis are described as follows:1. Through the simplifying and assuming, this thesis establishes the BTT missile's kinematical model and dynamical model. Considering that the state variables can be measured easily and the autopilot can be designed expediently, the BTT missile's control model in which all trajectory states can be measured is presented in this thesis.2. The large airspace flying BTT missile's autopilot is designed by using the robust H mixed sensitivity design method. By simulation of this autopilot on standard state point and special state points, this robust control system's high-speed response ability and good robust stability is validated. Under this autopilot's control, the BTT missile can fly stably along many trajectories in a large airspace.3. Based on the fore works, this thesis gives the BTT missile's six degree of freedom simulation model with the robust control system designed in this work. It also gives the program of BTT missile's 6DOF simulation model with C++ computer language.4. The simulations of BTT missile against maneuvering targets are studied. The simulation results show that the BTT missile's robust autopilot designed on a standard state point can make the BTT missile fly stably along the whole trajectory, and has the ability of intercepting maneuvering targets.