Variable-structure Guidance Law with Terminal Angular Constraint of Video-guided Penetrating Bomb

According to the problem that terminal angular of video-guided penetrating bomb was required to be controlled,the variable-structure guidance law with terminal angular constraint was derived,which included the influence of the gravity on the normal acceleration of trajectory.The angle-of-attack was estimated by the method that the guidance instruction passed through a first order low pass filter.Through computer simulation,the influence of the guidance law parameters on the guidance performance was discussed.The effect of guidance law was tested under the conditions of different bomb release method and different expected impact angle.The simulation shows that the angle-of-attack estimation method is feasible,and that the guidance law can meet the demands of terminal miss distance and impact angle when the penetrating bomb attacks a fixed target.