Terminal guidance law for exoatmospheric kill vehicle

A simple and effective terminal guidance law for exoatmospheric interceptor, which uses a kinetic kill vehicle for a direct hit kill, is proposed. Firstly, a new analytic expression of zero effort miss is derived, because the difference of gravity for interceptor and ballistic missile is taken into account, so the expression has good fidelity as compared with that in the case where gravitational accelerations acting upon both vehicles are equal. A terminal guidance law is designed using the zero effort miss steering. The thrusters with variable thrust by pulse-width modulated (PWM) technique are examined. The guidance law is proved using PWM with engineering constraints. Simulation results show that the presented guidance law guarantees perfect intercept for maneuvering target and has goodlau robustness.