Microwave and Millimeter-Wave Ubiquitous Physiological Sensing Using Low-Cost Doppler Radar and Communication Systems

Abstract

Microwave and millimeter-wave Doppler radar can remotely detect physiological parameters, such as respiration and heart signals. Recent work on physiological Doppler radar further sought to extend continuous radar monitoring beyond controlled settings and into unconstrained environments common to applications such as security, human-machine interface, at-home medical tests, intelligent buildings, and search and rescue operations. Challenges in unconstrained environments include separating signals from multiple individuals and ubiquitous coverage indoors and outdoors. This thesis addresses those challenges as follows: (1) phase correlation approach is proposed and demonstrated effective for signal separation from multiple, close spaces sources using a single antenna, single channel 2.4 GHz radar (2) physiological sensing using channel state information (CSI) for 28 GHz OFDM communication system is modeled and successfully demonstrated experimentally, and (3) remote life sensing, compact and fully integrated 24 GHz dual radar system is implemented to enable noise cancellation for moving platform like UAV.