A spectral mPOD reformulation uses compact disjoint frequency masks to block-diagonalize the correlation operator, shrinking eigenvalue problems to per-band sizes while recovering identical modes and singular values.
Mendez, Generalized and Multiscale Modal Analysis, Cambridge University Press, 2023, p
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A Fast Spectral Formulation of the Multiscale Proper Orthogonal Decomposition
A spectral mPOD reformulation uses compact disjoint frequency masks to block-diagonalize the correlation operator, shrinking eigenvalue problems to per-band sizes while recovering identical modes and singular values.