An Optimal Guidance Law for Boost Phase Interception of Ballistic Missile

In order to intercept ballistic missile during the boost phase,the linear quadratic differential game theory was introduced to design air-borne interceptor guidance law.Based on the pursuit-evasion conflict model between interceptor and ballistic missile,two optimal guidance commands were proposed separately with previous target information and without.The guidance process was divided to the terminal guidance phase and the trajectory-shaping phase by applying the control decomposition strategy.The proposed guidance law can eliminate the effects of target evasive maneuver and estimation error,and the guidance law has strong applicability.The simulation results show that the guidance laws satisfy the required index,and the interceptor can hit the target directly.