Comprehensive Comparison of Continuous-Wave and Linear-Frequency-Modulated Continuous-Wave Radars for Short-Range Vital Sign Monitoring

Abstract

The use of radar technology for contactless monitoring of cardiorespiratory activity has been a significant research topic for the last two decades. However, despite the abundant literature focusing on the use of different radar architectures for healthcare applications, an in-depth analysis is missing about the most appropriate configuration. This paper presents a comparison between continuous-wave (CW) and linear-frequencymodulated continuous-wave (LFMCW) radars for application in vital sign monitoring scenarios. These waveforms are generated with the same architecture at two different frequencies: 24 and 134 GHz. Results evidence that both configurations are capable of measuring general metrics, such as the breathing and heart rates. However, LFMCW offers better results in the identification of cardiac events and the extraction of certain derived biomarkers, such as the heart rate variability sequences (HRV). Conclusions show that this performance does not depend on the selected working frequency.

Non‐contact vital signs monitoring in broiler chickens

“…However, to the best of our knowledge, none of the work is focused on utilizing CW radar for vital signs monitoring of broiler chickens. CW radar has a simpler architecture than the FMCW radar and has less signal processing chain [12]. Therefore, in this work, we focused on utilizing a 24-GHz CW Radar module for extracting the vital signs of broiler chickens.…”