Abstract:

For the terminal phase of underwater kinetic energy weapon impacting the maneuvering targets, the terminal guidance problem is studied to get better damage effect. Based on the backstepping sliding mode control method and the linear extended state observer, a nonlinear guidance law with impact angle constraints is proposed. Through analyzing numerical aspects of the impact angle, the nonlinear sliding mode surface is designed, and according to the sliding mode reaching condition, the guidance law is divided into two parts which ensure the system can reach and move on the sliding mode surface. The designed guidance law guarantees the stability and robustness of the system. Considering the target maneuvering, the target maneuvering is considered as an unknown disturbance which is estimated by the linear extended state observer. The designed guidance law can guarantee the line of sight angular rate converge to zero and impact angle converge to a desired value. Theoritical analysis and simulation results show that the stability and effectiveness of the presented approach respectively.