Subspace Identification of Linear Time-Periodic Systems with Periodic Inputs
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.
Keywords
Cite
@article{arxiv.2006.03838,
title = {Subspace Identification of Linear Time-Periodic Systems with Periodic Inputs},
author = {Mingzhou Yin and Andrea Iannelli and Roy S. Smith},
journal= {arXiv preprint arXiv:2006.03838},
year = {2020}
}