OPASTOrthogonal Projection Approximation Subspace Tracking
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In order to avoid the heavy computation of SVD, OPAST is employed to update the extended observability matrix and implement the recursive P[BSID.sub.opt] ([RPBSID.sub.opt]) identification.
An OPAST method is proposed to update the extended matrix [[bar.[GAMMA]].sub.f].
For alleviation of the divergence, the OPAST method adds an orthonormalization step at each iteration:
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