Adaptive Robust Guidance Law Design for Air-to-Ground Missile with Impact Angle Constraint

According to impact angle requirement in the case of air-to-surface missile attacking the target,based on variable structure theory,a nonlinear terminal guidance law was proposed by zeroing the rate of line-of sight angle with a study of the condition of terminal angle corresponding to the state equation of a missile-target relative motion system.The asymptotic stability of guidance system was proven by Lyapunov stability theory.When the guidance law was used,the expected impact angle and guidance precision were met.Simulation results with the guidance law show that the guidance law is a strongly robust guidance law against targets in the ground in the case of no any target information.