Robust D-stability analysis for linear uncertain systems by unified approach using the delta operator

The problem of robust performance analysis for the delta operator formulated uncertain systems is considered. Sufficient conditions for D-stability robustness of the unified delta operator systems with structured uncertainty are presented in terms of matrix measure approach, which the desired closed-loop poles are constrained to locate within a prespecified D-region. The proposed results can unify related conclusions of continuous time and discrete time systems into the delta operator framework.