Abstract: Using the Lyapunov stability theory and linear matrix inequality approach, we considered the reducedorder H_∞ filtering problem for singular neutral systems. Firstly, some sufficient conditions for the reducedorder H_∞ filter of singular neutral systems were given such that the resulting filtering error system was asymptotically stable and H_∞ norm was less than a given performance index γ. Secondly, the expression of the reducedorder H_∞ filters were given in the form of parametric display. Numerical results show that the conclusions are feasible and effective.

Key words: neutral system, reducedorder H_∞ filter, singular system, linear matrix inequality