Research on 3D Terminal Guidance Laws Based on Actively Self-homing Spiral Variable Trajectory

Design scheme of 3D guidance laws(GLs) based on actively self-homing spiral variable trajectory for the supersonic antiship missile was proposed to solve that the friendly missile can either evade the enemy interceptor or hit the sea maneuver target.Geometric relation models of relative motions among the missile,the interceptor and the ship were established;spiral variable trajectory of the missile during the course of pursuit was realized by making angular rate of lineof-sight-angle(LOSA) track the given spiral variable trajectory command signal based on the adaptive sliding mode variable structure control idea to evade the enemy interceptor;angular rate of LOSA during the course of flying was approached to zero by selecting the reasonable parameters to ensure that the friendly missile can hit the sea maneuver ship.The simulated results show that the GLs can either make the antiship missile perform actively spiral variable trajectory,i.e.make the miss amount of the enemy interceptor reach the minimum of 209.233 m at the time of 4.41 s,or hit the sea maneuver ship at the precision indicated by the miss amount of 0.932 m.