Design of Three-Dimensional Guidance Law Based on Relative Velocity Deflection Angle for Ship-Air Missile

Aiming at the ship-air missile intercepting the low target,the three-dimensional relative motion between missile and target was established.The high maneuverability of the target and the measurement noise of seeker measuring line of sight(LOS) angular rate were considered,and it was also considered that terminal guidance should be carried out in three-dimensional space.The relative motion model of missile intercepting target was constructed,and the relative-velocity deflection-angle was chosen as the purpose to be zeroed.A variable-structure three-dimensional terminal guidance with strong robustness was designed based on the theory of variable structure,and the model of the guidance instruction solution was presented.The simulation result not only verifies the accuracy of solution model,and it also shows that the robustness of the designed three-dimensional variable-structure terminal guidance law is much better than that of the traditional three-dimensional terminal guidance law.