%0 Journal Article
%T Enhanced H∞ filtering for continuous-time state-delayed systems<br>Enhanced H∞ Filtering for Continuous-time State-delayed Systems
%A Ying Zhang
%A Ai-Guo Wu
%A Guang-Ren Duan
%A <br>
%J 国际自动化与计算杂志
%D 2009
%I 
%X The H∞ filtering problem for continuous-time polytopic uncertain time-delay systems is investigated. Attention is focused on the design of full-order filters guaranteeing a prescribed H∞ attenuation level for the filtering error system. First, a simple alternative proof is given for an improved linear matrix inequality (LMI) representation of H∞ performance. Then, based on the performance criterion which keeps Lyapunov matrices out of the product of system dynamic matrices, a sufficient condition for the existence of robust estimators is formulated in terms of LMIs, and the corresponding filter design is cast into a convex optimization problem which can be efficiently handled by using standard numerical algorithms. It is shown that the proposed design strategy allows the use of parameter-dependent Lyapunov functions and hence it is less conservative than some earlier results. A numerical example is employed to demonstrate the feasibility and advantage of the proposed design.
%K Conservativeness
%K parameter-dependence
%K time-delay systems
%K linear matrix inequality (LMI)<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7139AD613512F4F05F6D525B914296AA&aid=D7CCE4E4DED61BD6B1E88A70794F6A3B&yid=DE12191FBD62783C&vid=B31275AF3241DB2D&iid=0B39A22176CE99FB&sid=BA79719BCA7341D5&eid=D5C9DC4EF2F78008&journal_id=1476-8186&journal_name=国际自动化与计算杂志&referenced_num=0&reference_num=15