Optimal Sliding-Mode Guidance Law for Fixed-Interval Propulsive Maneuvers

An optimal strategy based on minimum effort control and also with terminal positionconstraint is developed for an exoatmospheric interceptor with a fixed- interval guidance time. It isthen integrated with sliding-mode control theory to drive an optimal sliding-mode guidance law forfixed-interval guidance time. In addition, this guidance law is generalized for intercepting anarbitrarily time-varying target maneuver. Robustness of the new guidance method againstdisturbances and good miss distance performance are achieved by the second method of Lyapunovand simulation results. The presented guidance law is simple to implement in practical applications.