Dynamic Surface Fuzzy Adaptive Terminal Guidance Law with Impact Angle Constraints and Autopilot Lag

In the terminal guidance section of large caliber naval gun guided projectile (GP) while striking near shore maneuver target, a terminal guidance law based on dynamic surface and fuzzy adaptive was proposed with autopilot lag and impact angle constraints. The relative motion model of GP and target in two-dimensional was constructed and extended state observer (ESO) was used to estimate target acceleration. Fuzzy adaptive system was applied to approach variable structure term and weaken chattering of autopilot control instruction. The tracking error about line of sight (LOS) and LOS rate in the closed loop system are all uniformly bounded, which is proved through Lyapunov second method. Simulation experiments show this law makes large caliber naval gun GP possess well terminal guidance performance while striking near shore maneuvering target with different acceleration forms.