Variable structure guidance law with terminal attack angle constraint

Aiming at war requirements of some missiles with terminal attack angle constraint, a kind of variable structure guidance law with miss distance and terminal attack angle constraint was derived according to slip-form variable structure control theory. Performances of the proposed guidance law were analyzed. The law is simple and practical, moreover it can overcome limitation of the passive target homing missile, which can' t measure the distance change rate between missile and target. The simulation results show that the guidance law can be used to hit the varying accelerated targets with expected terminal attack angle. The law shows better robustness for maneuvering target.