In this paper, we investigate the filter design problem for linear continuous-time systems with parameter variations in system matrices. The parameter variations are assumed to belong to a polytope with finite and known vertices. The designed filter parameters and the constructed Lyapunov function are both dependent on the online measured variations. A new sufficient condition for the existence of parameter-dependent filters is established and it can guarantee that the filtering error dynamic system is asymptotically stable and can satisfy the prescribed norm bound. Then, the design of the filter is proposed by solving a set of linear matrix inequalities (LMIs). Simulation studies and comparison examples are provided to illustrate the effectiveness of the proposed method.

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