Observer-based quadratic stabilization with dominant pole placement

This paper proposes an observer-based output feedback design method which attains both quadratic stabilization and dominant pole placement. For a system whose state signal is unavailable and whose coefficient matrices have structured uncertainty, the method gives a controller which satisfies an H(infinity) norm condition for quadratic stability and the partial pole configuration, under a certain sufficient condition. This is achieved by means of the parameterization of partial pole placement which has already been known for the state feedback case. Degradation due to adopting state observers is then discussed. A numerical example is given to illustrate the proposed method. Copyright ((C))2000 IFAC.