A variable structure terminal guidance law with adaptive quick-reaching law and a filter approach based on sliding mode observer was developed for short time interception. During the ideal and non-ideal condition with typical target maneuvers, the simulation results demonstrates the higher accuracy, better robustness and easy realized of the designed guidance law by comparing with the conventional proportional navigation, augmented proportional navigation and switched bias proportional navigation. Also the filter approach is shown to be more effective than the extended Kalman filter (EKF) for the colored noise.
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