Exponential H∞ filtering for switched linear systems with interval time-varying delay

This paper deals with the problem of exponential H-infinity filtering for a class of continuous-tithe switched linear system with interval time-varying delay. The time delay under consideration includes two cases: one is that the time delay is differentiable and bounded with a constant delay-derivative bound, whereas the other is that the time delay is continuous and bounded. Switched linear filters are designed to ensure that the filtering error systems tinder switching signal with average dwell time are exponentially stable with a prescribed H-infinity noise attenuation level. Based on the free-weighting matrix approach and the average dwell technology, delay-dependent sufficient conditions for the existence of such a filter are derived and formulated in terms of linear matrix inequalities (LMIs). By solving that corresponding LMIs, the desired filter parameterized matrices and the minimal average dwell time are obtained. Finally, two numerical examples are presented to demonstrate the effectiveness of the developed results. Copyright (c) 2008 John Wiley & Sons, Ltd.