Radar is an interesting sensing principle to monitor basic vital signs comfortably without body contact and with low-cost Radar sensors (Emerald, From Wearables to Invisibles; Thiel, Kreiseler, & Seifert, 2009).

It uses electromagnetic waves as sensitive probes, which are reflected at the chest wall and undergo a Doppler frequency shift if the chest wall is moving due to the subject’s respiration (Muehlsteff, Pinter, & Morren, 2009) .

The technique is sensitive enough to even detect heartbeat information. However, any motion by a subject causes artifacts, which limit the applicability. Artifact handling is a topic of current research. Radar has intrinsic advantages as well as disadvantages, which have to be considered for each particular monitoring scenario. Commercial devices exist for sleep monitoring.

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Radar sensorsRadar sensors is used in liquid level detection
Radar is an interesting sensing principle to monitor basic vital signs comfortably without body contact and with low-cost Radar sensors (Emerald, From Wearables to Invisibles; Thiel, Kreiseler, & Seifert, 2009). It uses electromagnetic waves as sensitive probes, which are reflected at the chest wall and undergo a Doppler frequency shift...