Optimal tracking compensator design in gap metric

The stabilization of line of sight against external disturbance is an essential feature of an electromechanical gimbaled sighting system with an optical sensor for sighting. The optimal robust controller based on gap metric is designed to control the rate of the line of sight for an electromechancial target tracking system. It is shown from simulations that the optimal robust controller with the biggest robust radius has the ability of disturbance rejection, and high tracking performance is obtained when additive uncertainty exists compared with the robust controller with smaller robust radius.