Optimal sliding-mode guidance of a homing-missile

An optimal guidance law based on missile-target LOS angular rate is presented for intercepting a nonmaneuvering target. It is then integrated with sliding-mode control theory to derive an optimal sliding-mode guidance law for intercepting maneuvering target. The new guidance method's robustness against target manoeuvres and good miss distance performance is proved by the second method of Lyapunov and simulation results. The presented guidance law is simple to implement in practical applications.