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. 2019 Jun 5;6(6):190149. doi: 10.1098/rsos.190149

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© 2019 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Radar signal obtained from each step of the block diagram. (a) Raw frame received by radar antenna. (b) Clutter removal frame obtained from background subtraction. (c) Neonatal respiratory waveform acquired for 8 s. (d) Respiratory waveform obtained through low-pass filtering of neonatal respiration frequency.