Geodesic
Some Algorithmic Aspects of Subspace Identification With Inputs
International Journal of Applied Mathematics and Computer Science, Tome 11 (2001) no. 1, pp. 55-75.

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It has been experimentally verified that most commonly used subspace methods for identification of linear state-space systems with exogenous inputs may, in certain experimental conditions, run into ill-conditioning and lead to ambiguous results. An analysis of the critical situations has lead us to propose a new algorithmic structure which could be used either to test difficult cases and/or to implement a suitable combination of new and old algorithms presented in the literature to help fixing the problem.
Keywords: subspace identification, multivariable systems, identification with inputs, ill-conditioning
Mots-clés : podprzestrzeń, układ wielowymiarowy 
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     author = {Chiuso, A. and Picci, G.},
     title = {Some {Algorithmic} {Aspects} of {Subspace} {Identification} {With} {Inputs}},
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Chiuso, A.; Picci, G. Some Algorithmic Aspects of Subspace Identification With Inputs. International Journal of Applied Mathematics and Computer Science, Tome 11 (2001) no. 1, pp. 55-75. http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_1_a2/