A Portable 24GHz Doppler Radar System for Distant Human Vital Sign Monitoring

Abstract

Vital sign detection using Doppler radar can be potentially applied in health care and home monitoring. While most of developed Doppler radars are designed in laboratory environments, this paper introduces a portable 24 GHz Doppler radar using commercial modules at low cost. The Doppler radar system adopts the commercially available 24GHz transceiver module to obtain analog quadrature signals, the signals are digitalized using analog-to-digital conversion in microcontroller, then sent to laptop or mobile phone via a series to WIFI module. All the modules are implemented on a printed circuit board to achieve the small size. Experiments validate that the Doppler radar can sense human respiration and heartbeat rates successfully using time frequency based signal processing algorithms.