This work tests the ability of a frequency-modulated continuous wave (FMCW) radar to measure the respiratory rate and the eartbeat of a subject in challenging indoor scenarios. To simulate a realistic configuration for ambient assisted living (AAL) applications, in which the thorax orientation towards the antenna is typically unknown, four different scenarios were considered. Measurements were performed on five volunteers positioned with the chest, left, back, and right side facing the antenna, respectively. The 5.8GHz radar and the antennas used for the measurements were suitably designed for the considered application. To obtain a low cost and compact system, series-fed arrays were preferred over other antenna topologies. The geometry of the patches was opportunely shaped to reduce the side lobe level (SLL) and increase the bandwidth, thus ensuring good system performances. In all scenarios, the vital signs extracted from the radar signal were compared with the ones collected by a photoplethysmograph and a respiratory belt, used as references. A statistical analysis of the measured data on the different subjects and orientations was performed, showing that the radar was able to measure with high accuracy both the respiratory rate and the heartbeat in all considered configurations.

An FMCW radar for localization and vital signs measurement for different chest orientations / Sacco, Giulia; Piuzzi, Emanuele; Pittella, Erika; Pisa, Stefano. - In: SENSORS. - ISSN 1424-8220. - 20:(2020), pp. 1-14. [10.3390/s20123489]

An FMCW radar for localization and vital signs measurement for different chest orientations

Giulia Sacco
;
Emanuele Piuzzi;Erika Pittella;Stefano Pisa
2020

Abstract

This work tests the ability of a frequency-modulated continuous wave (FMCW) radar to measure the respiratory rate and the eartbeat of a subject in challenging indoor scenarios. To simulate a realistic configuration for ambient assisted living (AAL) applications, in which the thorax orientation towards the antenna is typically unknown, four different scenarios were considered. Measurements were performed on five volunteers positioned with the chest, left, back, and right side facing the antenna, respectively. The 5.8GHz radar and the antennas used for the measurements were suitably designed for the considered application. To obtain a low cost and compact system, series-fed arrays were preferred over other antenna topologies. The geometry of the patches was opportunely shaped to reduce the side lobe level (SLL) and increase the bandwidth, thus ensuring good system performances. In all scenarios, the vital signs extracted from the radar signal were compared with the ones collected by a photoplethysmograph and a respiratory belt, used as references. A statistical analysis of the measured data on the different subjects and orientations was performed, showing that the radar was able to measure with high accuracy both the respiratory rate and the heartbeat in all considered configurations.
2020
FMCW radar; vital signs; AAL
01 Pubblicazione su rivista::01a Articolo in rivista
An FMCW radar for localization and vital signs measurement for different chest orientations / Sacco, Giulia; Piuzzi, Emanuele; Pittella, Erika; Pisa, Stefano. - In: SENSORS. - ISSN 1424-8220. - 20:(2020), pp. 1-14. [10.3390/s20123489]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1420795
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