Missile guidance law with terminal impact angle constraint

The correlation between terminal impact angle and expected angle of sight was analyzed to ensure impact angle of a missile. A guidance law with a terminal impact angle constraint was proposed based on Lyapunov stability theorem and estimation about time-to-go. The proposed guidance law is simple and overcomes the limitation that a passive homing missile does not has a distance-measurement function. Numerical simulation results demonstrate that the proposed guidance law can guide the missile to hit some mobile targets with high maneuverability by stem chase impact or perpendicular impact.