Robust strict positive real stabilization criteria for SISO uncertain systems

This paper is devoted to the study of robust strict positive real stabilization criteria for SISO uncertain systems, i.e., considering the problem of when a single controller not only robustly stabilizes a plant with uncertainty under unity-feedback but also enables the closed-loop system to be robustly strictly positive real. The uncertain system models with both parameter variation and unstructured perturbation are considered and some necessary and sufficient conditions for the problem are derived.