Stable observer-based controller design for robust state-feedback pole assignment

The design of stable observer-based controllers for robust pole assignment is addressed in this paper. The stability problem of these dynamical contro llers is investigated, which is often ignored during the controller design. A design formulation of stable observer controllers is presented using sta te-feedback pole assignment techniques. Although the design formulation is principally aimed at the design of a stable controller, the mixed sensitive function in the frequency domain is also considered to improve the robustn ess of the closed-loop system. This ensures that the closed-loop system has good robustness and the controller is stable.