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. 2018 Aug 27;18(9):2832. doi: 10.3390/s18092832

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© 2018 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/).

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The process of obtaining s by WIP motion: (a) The finding of s. The top peak represents the maximum $Y_{p o s}$ between two steps, and the bottom peak represents the $Y_{p o s}$ when the current step is recognized. (b) s, which is the difference between the top peak and the bottom peak. The value of s is located between $S_{m i n}$ and $S_{m a x}$ thresholds ( $s \in [0.02, 0.1]$ ).