Constant reference tracking control for uncertain linear sampled-data systems

This paper studies the reference-tracking control problem for uncertain sampled-data systems with partial observation of the states. We show that, by robustly stabilizing the closed-loop system, the proposed digital controller ensures that the controlled output tracks constant set points. Moreover, new design conditions given in terms of Differential Linear Matrix Inequalities are presented for obtaining controllers with partial and complete measurements of the states. The design conditions are illustrated by numerical examples.