Terminal guidance law design for side jet control missile based on adaptive fuzzy variable structure control

A terminal guidance law for side jet control missile based on adaptive fuzzy variable structure control (AFVSC) is proposed. Although the performance of missile including the maneuvering ability and rapid response ability is greatly improved because of using side jet control, the guidance system is strong coupling nonlinear and the system parameter is uncertain. The universal approximation ability of adaptive fuzzy system is used to approximate the nonlinear function to any degree of accuracy which is unknown in the missile guidance system so as to overcome the influence of model uncertainty and external disturbance. And by adaptively adjusting maximum acceleration of maneuvering target, the gain of the variable term in this law can be changed with maneuver magnitude, so this law can be adapt to all kinds of maneuvering targets. The simulation results show that this law has stronger robustness to high maneuvering target and higher guidance precision while intercepting all kinds of maneuvering targets.