Subspace Identification of Linear Time-Periodic Systems with Periodic Inputs

Mingzhou Yin; Andrea Iannelli; Roy S. Smith

doi:10.1109/lcsys.2020.3000950

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arXiv · 2006.03838

Subspace Identification of Linear Time-Periodic Systems with Periodic Inputs

Mingzhou Yin·Andrea Iannelli·Roy S. Smith

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Abstract

This paper proposes a new methodology for subspace identification of linear time-periodic (LTP) systems with periodic inputs. This method overcomes the issues related to the computation of frequency response of LTP systems by utilizing the frequency response of the time-lifted system with linear time-invariant structure instead. The response is estimated with an ensemble of input-output data with periodic inputs. This allows the frequency-domain subspace identification technique to be extended to LTP systems. The time-aliased periodic impulse response can then be estimated and the order-revealing decomposition of the block-Hankel matrix is formulated. The consistency of the proposed method is proved under mild noise assumptions. Numerical simulation shows that the proposed method performs better than multiple widely-used time-domain subspace identification methods when an ensemble of periodic data is available.

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BibTeX RIS

Mingzhou Yin, Andrea Iannelli, Roy S. Smith. 2020-06-06. Subspace Identification of Linear Time-Periodic Systems with Periodic Inputs. https://doi.org/10.1109/lcsys.2020.3000950

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