An Improved Approach for Stability Analysis of Discrete System

Abstract

This paper presents an improved technique to analyze the stability margin of the discrete systems. The presented approach is based on the reduced conservatism of eigenvalues and scaling of Gerschgorin circles. The mathematical proof and sufficient condition with suitable scaling is stated for the conservatism of eigenvalues. Moreover, the presented technique is demonstrated with the numerical examples. Further, the improved results are compared with the existing methods.