Subspace identification with moment matching

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We propose a deterministic identification method that involves a priori information characterized as moments of a transfer function. The moments are expressed in terms of the solution to a Sylvester matrix equation. The Sylvester equation is incorporated with a conventional subspace identification method, and a problem for moment-constrained subspace identification is formulated. Since the identification problem is in a class of nonlinear optimization problems, it cannot be efficiently solved in numerical computation. Application of a change-of-variable technique reduces the problem to least squares optimization, and the solution provides a state-space model that involves the prespecified moments. Finally, the effectiveness of the proposed method is illustrated in numerical simulations.

Original languageEnglish
Pages (from-to)22-32
Number of pages11
JournalAutomatica
Volume99
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Frequency-response characteristics
  • Least-squares method
  • Subspace method
  • System identification

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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