  This study proposes a sensing method using a millimeter-wave array radar and
a depth camera to measure pulse waves at multiple sites on the human body.
Using a three-dimensional shape model of the target human body measured by the
depth camera, the method identifies reflection sites on the body through
electromagnetic scattering simulation. On the basis of the simulation, the
radar system can be positioned at a suitable location for measuring pulse waves
depending on the posture of the target person. Through measurements using radar
and depth camera systems, we demonstrate that the proposed method can estimate
the body displacement waveform caused by pulse waves accurately, improving the
accuracy by 14% compared with a conventional approach without a depth camera.
The proposed method can be a key to realizing an accurate and noncontact sensor
for monitoring blood pressure.
