Three-Dimensional Impact Angle Guidance Laws for Precision Guided Munition

Abstract

This paper proposes three-dimensional guidance laws for impact efficiency enhancement of precision guided munitions. This requires a vertical impact angle while the maneuverability and overall flight time of a munition are limited. For that, nonsingular terminal sliding mode control theory is applied which uses two switching surfaces of power-rate reaching law. The proposed guidance law allows a projectile trajectory with desired terminal impact angle in a finite time and allowable control inputs while handling the coupled non-linear dynamical behavior of munitions. Furthermore, it prevents the singularity problem of the conventional terminal sliding mode controller. To verify the performance of the proposed guidance law against a stationary target, it has been applied on a realistic ballistic model which considers drag and gravity. Simulation results demonstrate the performance of proposed guidance laws under various launch conditions are investigated.