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Improving Linear State-Space Models with Additional Iterations

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arxiv 2003.06304 v1 pith:PATR4YG4 submitted 2020-03-13 eess.SY cs.SY

Improving Linear State-Space Models with Additional Iterations

classification eess.SY cs.SY
keywords estimationfurthergenerallyimprovediterationslinearmodelsre-estimation
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An estimated state-space model can possibly be improved by further iterations with estimation data. This contribution specifically studies if models obtained by subspace estimation can be improved by subsequent re-estimation of the B, C, and D matrices (which involves linear estimation problems). Several tests are performed, which shows that it is generally advisable to do such further re-estimation steps using the maximum likelihood criterion. Stated more succinctly in terms of MATLAB functions, ssest generally outperforms n4sid.

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