Optimization Design of Perpendicular Hit Terminal Trajectory for Lightweight Antisubmarine Torpedo

Although it is more theoretically perfect and compendious than other guidance laws, the optimal perpendicular hit terminal guidance law based on Pontryagin′s minimal principle is more difficult to be applied directly to lightweight antisubmarine torpedo trajectory design for its idealization and indeterminate control coefficients. Accordingly, a practical optimization method is introduced into perpendicular hit terminal trajectory design for a lightweight antisubmarine torpedo in this paper. In this method, engineering-oriented secondary optimization is performed on the guidance law mentioned above to gain optimal guidance laws for different initial operation postures. Digital simulations demonstrate the feasibility and reliability of the proposed method. In addition, the design sensitivity of the terminal trajectory optimization system is analyzed, and suggestions about the optimization design are offered.