Research On Blended Control Of Agile Air-to-air Missile

In order to cope with the challenges of air combat in the future, and take control of air combat advantage, the capability of air-to-air missile is urgently to be enhanced.This thesis focuses on the blended control method of agile air-to-air missile. An air-to-air missile that possesses lateral jet and aerodynamic rudder is considered, this thesis aims at solving the possible problem in actual implementation, and this work will lay a foundation for lateral force application on air-to-air missile.Firstly, the model of lateral force and moment are built, and then in order to model the aerodynamics of missile, a method that can estimates high angle of attack aerodynamics using aerodynamics of low angle of attack is put forward. Afterwards, the missile's model of kinematics and dynamics are established by using related laws and formulas. Therefore the attitude control model can be derived, which is an basis of further analysis and design.Secondly, a gas jet of nozzle equipment is considered to provide lateral force for mis-sile, and its characteristics are investigated as well as the corresponding relation between thrust and on/off of nozzles. Then model predictive control (MPC) is introduced and the description of problem and methodology with consideration of inputs constraint set and inputs coupling are given sccessively. Aiming to improve the performance of control sys-tem, an algorithm dealing with input time delay is designed. Numerical simulation is done and results are analyzed.Thirdly, in view of the characteristic of aerodynamic rudder, the self-stable region(SSR) approach which has excellent performance on robustness and disturbance rejection,is introduced to control design. Procedure of design for pitch and yaw are both given in detail. Numerical simulation is done and results are analyzed.Finally, taking account of dual actuators working jointly on the missile, a blended control strategy is proposed combining the lateral force actuator with model predictive controller and aerodynamic actuator with self-stable region approach controller. Further simulation is done on the case of over-the-shoulder launch for air-to-air missile, which verifies the effectiveness of blended control scheme.