Design Of Guidance And Control System For Hypersonic Anti-ship Missile In Dive Phase

In this paper,the guidance and control system is designed for the dive phase of hypersonic anti-ship missile.The six degree of freedom model of hypersonic anti-ship missile in dive phase is established,and the control oriented attitude model of hypersonic anti-ship missile is derived.Considering that the hypersonic anti-ship missile has the characteristics of strong nonlinearity,fast time-varying,strong coupling and strong uncertainty,the model uncertainty and external disturbance of the missile are reduced to the total disturbance term,and the attitude control of the hypersonic anti-ship missile in dive phase based on adaptive critic is designed.The current state of the missile is evaluated quantitatively by the critic function The critic value is used to adaptively update the feedforward compensation term in the controller,so that the missile can stably control the attitude motion of the missile through continuous on-line learning in the flight process.The simulation results show that the method can reduce the tracking error,enhance the robustness and improve the tracking dynamics The stability of the system is proved based on Lyapunov theory.In the case of saturation control,the saturation angle of the missile can be taken into account.Finally,the stability of the system is proved based on Lyapunov theory.For the guidance system of dive phase,the guidance system of hypersonic anti-ship missile in dive phase is designed considering the impact angle constraint.Firstly,the three-dimensional relative motion model of missile and target is deduced.Then,based on the theory of fast convergence,a new type of fast convergence dynamic surface and reaching rate are designed,which can make the system state converge from the state outside the dynamic plane to the equilibrium point in finite time.The stability of the system is proved based on Lyapunov theory.The simulation results show that the method improves the accuracy of attack and angle of fall.Finally,the joint simulation of guidance system and control system is carried out.Aiming at the problem of coupling between the guidance and control system loops based on time scale separation,the integrated guidance and control design of hypersonic anti-ship missile in dive phase is designed.The guidance and integration method based on sliding mode dynamic surface is designed.The simulation results are compared with the guidance and control system based on time scale separation.The simulation results show that the integrated method is better than the guidance and control method based on time scale separation.