Modern explicit guidance law for high-order dynamics

The development of optimal guidance law (OGL) for high-order dynamics is discussed. OGLs are developed by the consideration of the target future maneuver and the dynamics of an interceptor and its target from perfect to time-invariant high-order autopilots. The desired performance index in the exoatmosphere is usually the amount of fuel required for corrective maneuvers. The elements of the guidance gain matrix corresponding to the states with unconstrained final values are set to zero.