Research On BTT Missile Control System Based On Dynamic Inversion Control And Sliding Mode Control

As a high-tech weapon of an aggressive, attacking accuracy and efficiency of kill, BTT(Bank-To-Turn) missile has drawn great attention of many countries. This thesis deals with the BTT missile model which is a strong coupled, multiple-input and multiple-output nonlinear system. Meanwhile, despite of an open-loop stable system, the BTT missile control system is with a big overshoot and long stabilization time. Furthermore, the flying process of the missile is under continuous parameter perturbation and external disturbance.For this kind of system, conventional control methods are not available or not fully effective. So this thesis is to propose a series of control strategies to achieve good control effects.Firstly, a dynamic inversion method is introduced to the design of BTT missile control loop. At the same time, a dynamic inversion controller is developed by combining with time scale separation method. Next, to compensate the poor robustness for the dynamic inverse control, a sliding mode controller is proposed. Finally, to attenuate chattering of the sliding mode controller based on exponential reaching law, a modified algorithm based on new reaching law of sliding mode control algorithm is given and is applied to the BTT missile control loop.In order to verify the effectiveness of the algorithms, numerical simulations are performed by Matlab/Simulink software respectively. Through the comparison of these three algorithms, it is shown that the proposed sliding mode controllers based on new reaching law can greatly improve the performance of the controller and the external disturbance and uncertainty within the system robust performance.