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. 2016 Aug 15;16(8):1293. doi: 10.3390/s16081293

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Two targets with time-varying respiration rates and VMD based algorithm results ( $k = 3$ , $α = 20,000$ ). (a) Original signals; (b) and (c) two modes decompose by VMD based algorithm; (d) time-varying respiration signals.