Abstract
This paper researches the state estimation problem for a class of T-S fuzzy system which subject to unknown input. By employing unknown input filter, the paper does a smooth estimation not only to the system states, but also the estimate signals and unknown disturbance inputs. Continuous-time system and discrete-time system are both studied to design the UIF for the T-S fuzzy system, and a converted system is constructed to solve the inequalities insolubility problem because of the exit of the unknown input. At last, a simulation result is used to illustrate the effectiveness of the proposed filter.
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