Robust two-degree-of-freedom H∞ control of a seeker scan loop system

A parameter-dependent model of the seeker scan loop system is introduced. A new approach to modelling real-valued parameter uncertainties and designing H, robust controllers considering the effect of parameter uncertainties on closed-loop stability and performance is presented, which is formulated within the framework of the standard H, optimisation problem by combining the conventional mixed sensitivity and model matching problems with the robust stability problem. The proposed design procedure is applied to the seeker scan loop system with uncertainties in three parameter values. It is shown that the designed two-degree-of-freedom H, controller offers good performance and robustness properties, and the proposed design scheme is very effective for robust control of the seeker scan loop system.