Robust control for seeker scan loop using sliding modes

This paper presents robust control of seeker system used in missile target scanning and tracking. The mathematical model for seeker system is considered. A sliding mode controller (SMC) is designed to compensate uncertain coupling effect and external disturbances during scan phase. The model of the plant is based on first-principle method. The dynamic equations of motion are formulated with the assumption that the seeker system is a rigid body with no mass imbalance. These equations of motion are considered in cascade with DC motor equations which provides the actuating torque to the gimbal axes of the seeker system. The performance of the controller is validated in simulations.