Platform motion disturbances attenuation in a missile seeker subsystem using Internal Model Control

In this paper two degree of freedom Internal Model Controller (2-DOF IMC) is used to attenuate the platform (missile body) disturbance that couples to the gimbal inner axis (elevation axis) angular rate of the seeker i.e. the angular rate of the inner (elevation) axis of the seeker gimbal in the pitch plane. IMC is an efficient robust controller and its use in process control system is very common. It can track reference input and simultaneously it also rejects the external disturbances that enter into the system. In this paper these features have been utilized to attenuate the base disturbances and disturbance torque in the seeker system.