On the existence and design of functional observers for linear systems
Trinh, Hieu and Fernando, T. 2007, On the existence and design of functional observers for linear systems, in IMAC 2007 Proceedings of the IEEE International Conference on Mechatronics and Automation, IEEE, Piscataway, NJ, pp. 1974-1979.
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Darouach  recently derived necessary and sufficient conditions for the existence and stability of functional observers with an order, p, equals to the dimension m of the vectors to be estimated. In general, these conditions are difficult to satisfy and when they are not, the only available option is to increase the order of the functional observers. This note presents new conditions for the existence of a general pth-order functional observer. Systematic procedures for the synthesis of reduced-order functional observers are given. A numerical example is given to illustrate the design procedures.
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