Lyapunov-Based Pursuit Guidance Law with Impact Angle Constraint

This paper presents Lyapunov-based pursuit guidance law against stationary targets. To design a nonlinear guidance law, Lyapunov candidate function is introduced to reduce the angle between the velocity vector of a missile and the distance vector between the missile and the target. Therefore, the proposed guidance laws have the characteristic of pursuit guidance. To attack a target from a predefined direction, the guidance law should be designed with impact angle constraint at the final phase. To deal with this, the impact angle error is augmented to the Lyapunov candidate function. The proposed guidance laws have simple forms to be implemented easily. Numerical simulations are performed to demonstrate the performance of the proposed guidance laws.