Robustness of Anti-Torpedo Torpedo Guidance Law Based on Variable Structure Control

For solving the difficulty in the guidance of anti-torpedo torpedo(ATT) due to low data ratio of underwater target information detection, an ATT guidance law based on variable structure control is designed, in which a variable structure controller is employed to keep a constant line-of-sight angle between ATT and incoming torpedo, and the con-troller shows good robustness for perturbation of model parameters. Theoretical analysis shows that perturbation of model parameters has no effect on the stability of the guidance law, and the line-of-sight angle between ATT and target can keep constant. Simulation validates that the proposed guidance law has good robustness for perturbation of model parameters, and the ATT with the guidance can hit target precisely.