Geodesic
An asymptotic state observer for a class of nonlinear delay systems
Kybernetika, Tome 37 (2001) no. 4, p. [459].

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The problem of state reconstruction from input and output measurements for nonlinear time delay systems is studied in this paper and a state observer is proposed that is easy to implement and, under suitable assumptions on the system and on the input function, gives exponential observation error decay. The proposed observer is itself a delay system and can be classified as an identity observer, in that it is such that if at a given time instant the system and observer states coincide, on a suitable Hilbert space, the observation error remains zero in all following time instants. The computation of the observer gain is straightforward. Computer simulations are reported that show the good performance of the observer.
Classification : 93B07, 93C10, 93C23
Keywords: nonlinear system; time-delay system; observability 
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     title = {An asymptotic state observer for a class of nonlinear delay systems},
     journal = {Kybernetika},
     pages = {[459]},
     publisher = {mathdoc},
     volume = {37},
     number = {4},
     year = {2001},
     mrnumber = {1859096},
     zbl = {1265.93029},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2001__37_4_a4/}
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Germani, Alfredo; Manes, Costanzo; Pepe, Pierdomenico. An asymptotic state observer for a class of nonlinear delay systems. Kybernetika, Tome 37 (2001) no. 4, p. [459]. http://geodesic.mathdoc.fr/item/KYB_2001__37_4_a4/