Vital information extraction using FMCW radar

Frequency modulated continuous wave (FMCW) radar, which can obtain the range and displacement of the target, is used for the non-contact vital monitoring. To extract vital information using the FMCW radar, it is necessary to select the range bin. This paper proposes a novel method of selecting the range bin for the extraction of vital information. We mathematically and experimentally verified that the vital displacement is reflected in the both magnitude and phase of the range profile. We devised the magnitude-phase coherency (MPC) index and selected the range bin with vital information based on the MPC index. In experimental results, We examined the accuracy of the vital rates extracted from the range bin selected by the proposed range selection method.