Robust Stabilization Control of a Two-Axis Gimbaled Seeker Using Parameter Uncertainties

A two-axis gimbaled seeker in missile identifies targets and commands the gimbal to maintain the selected target in the field-of-view. It has to stabilize the gimbal axis in the inertial plane against external disturbances induced by maneuvering and aerodynamic force of the missile using the stabilization control loop of the track control loop. It has been widely known that the precise target tracking is highly affected by missile motion decoupling capability of the stabilization control loop. This paper presents the two robust H-infinity control design methods including parameter uncertainties on the stability and performance of the closed-loop system with application to the stabilization control loop of the two-axis gimbaled seeker. The performance analysis shows that the proposed control design methods are very effective for achieving superior stabilization control performances for the two-axis gimbaled seeker.