LPV control with observed state feedback and dynamic output feedback

We recall some results concerning H/sub 2/ state feedback, pole placement in LMI regions and estimation of state by a full-order Lunberger observer. After this review, we search an LPV control for an uncertain system. Two methods are presented: the first is state feedback control with an observer and the second is control by dynamic output feedback. Assuming that the parameter variation is so slow that the system is nearly considered as time invariant, H/sub 2/ and pole placement constraints are taken into account.