Adaptive Terminal Sliding Mode Guidance Law with Impact Angle Constraint

Abstract

A finite-time convergent guidance law with impact angle constraint based on adaptive estimation of target maneuver is proposed for end-guidance interception under unknown target maneuver interference conditions Firstly, the impact angle constraint is converted into a terminal line-of-sight angle constraint, and a design method of the terminal sliding mode guidance law is given based on the finite-time convergence property of the terminal sliding mode. Secondly, an adaptive law is designed to estimate the upper bound of the target maneuvering acceleration. Finally the finite-time convergence property of the guidance law is proved based on Lyapunov stability theory, and the effectiveness of the guidance law in various interception scenarios is verified by mathematical simulation.