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Subspace identification method
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<p>In mathematics, specifically in <a href="/facts/Control_theory/aIuERpn6">control theory</a>, subspace identification (SID) aims at identifying <a href="/facts/Linear_time-invariant_theory/kEmj0QDC">linear time invariant</a> (LTI) state space models from input-output data. SID does not require that the user parametrizes the system matrices before solving a parametric optimization problem and, as a consequence, SID methods do not suffer from problems related to local minima that often lead to unsatisfactory identification results. </p>