Direct Closed-Loop Identification in Frequency Domain

Abstract

A novel frequency domain closed-loop identification algorithm using the output inter-sampling scheme is investigated in this paper. It is illustrated that the inter-sampled plant output has cyclostationary property, which can be used to eliminate the correlation between the plant input and output noise even though no persistently exciting test signal is available. It can be applied for the unstable plant identification problem, and can be extended to the situation where the output disturbance noise is colored.