title: Estimation of physiological sub-millimeter displacement with CW Doppler radar.
abstract: Doppler radar physiological sensing has been studied for non-contact detection of vital signs including respiratory and heartbeat rates. This paper presents the first micrometer resolution Wi-Fi band Doppler radar for sub-millimeter physiological displacement measurement. A continuous-wave Doppler radar working at 2.4GHz is used for the measurement. It is intended for estimating small displacements on the body surface resulting from physiological activity. A mechanical mover was used as target, and programmed to conduct sinusoidal motions to simulate pulse motions. Measured displacements were compared with a reference system, which indicates a superior performance in accuracy for having absolute errors less than 10μm, and relative errors below 4%. It indicates the feasibility of highly accurate non-contact monitoring of physiological movements using Doppler radar.
authors.lastname: Jia Xu
authors.lastname: Xiaomeng Gao
authors.forename: Bryson E
authors.initials: BE
authors.lastname: Padasdao
authors.forename: Olga
authors.initials: O
authors.lastname: Boric-Lubecke
mesh_terms: D004301:Doppler Effect; D006801:Humans; D010827:Physiology / Q000379:methods*; D011825:Radar; D013997:Time Factors