IEEE Trans Biomed Circuits Syst. 2023 Apr;17(2):229-245. doi: 10.1109/TBCAS.2023.3257647. Epub 2023 May 10.
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 article presents a comparison between continuous-wave (CW) and linear-frequency-modulated 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.
在过去的二十年中，雷达技术在非接触式心肺活动监测中的应用一直是一个重要的研究课题。然而，尽管有大量文献专注于使用不同的雷达架构应用于医疗保健，但对于最合适的配置却缺乏深入分析。本文比较了连续波（CW）和线性调频连续波（LFMCW）雷达在生命体征监测场景中的应用。这两种波形是在两个不同的频率下用相同的架构生成的：24GHz 和 134GHz。结果表明，这两种配置都能够测量一般指标，如呼吸和心率。然而，LFMCW 在识别心脏事件和提取某些衍生生物标志物（如心率变异性序列（HRV））方面表现更好。结论表明，这种性能不取决于所选的工作频率。
