Cyclic Spectra Based Approach to Direct Closed-Loop Identification

概要

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The direct closed-loop identification algorithm in frequency domain is considered in this paper. It is shown that the input and output signals obtained through the over-sampling technique have cyclic spectra, which give the frequency transfer function of the over-sampled model. Then a cyclic spectra based identification algorithm is implemented in the frequency domain. It is clarified that the test signal is not necessary, and the identifiability does not depend on the controller structure in the new algorithm. The effectiveness of the proposed algorithm is demonstrated in numerical simulations treating with unstable systems.
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