In this paper, we compare the performances of impulse radio ultra-wideband (IR-UWB) and frequency modulation continuous wave (FMCW) radars in measuring noncontact vital signs such as respiration rate and heart rate. These two type radars have been widely used in various fields and have shown their applicability to extract vital signs in noncontact ways. IR-UWB radar can extract vital signs using distance information. On the other hand, FMCW radar requires phase information to estimate vital signs, and the result can be enhanced with Multi-input Multi-output (MIMO) antenna topologies. By using commercial radar chipsets, the operation of radars under different conditions and frequency bands will also affect the performance of vital sign detection capabilities. We compared the accuracy and signal-to-noise (SNR) ratios of IR-UWB and FMCW radars in various scenarios, such as distance, orientation, carotid pulse, harmonics, and obstacle penetration. In general, the IR-UWB radars offer a slightly better accuracy and higher SNR in comparison to FMCW radar. However, each radar system has its own unique advantages, with IR-UWB exhibiting fewer harmonics and a higher SNR, while FMCW can combine the results from each channel.

中文翻译：

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IR-UWB雷达和FMCW雷达生命体征的实验比较

在本文中，我们比较了脉冲无线电超宽带（IR-UWB）和调频连续波（FMCW）雷达在测量呼吸频率和心率等非接触生命体征时的性能。这两种类型的雷达已广泛应用于各个领域，并显示出它们以非接触方式提取生命体征的适用性。IR-UWB雷达可以使用距离信息提取生命体征。另一方面，FMCW雷达需要相位信息来估计生命体征，并且可以通过多输入多输出（MIMO）天线拓扑来增强结果。通过使用商用雷达芯片组，雷达在不同条件和频带下的运行也将影响生命体征检测功能的性能。我们比较了IR-UWB和FMCW雷达在各种情况下（例如距离，方向，颈动脉脉冲，谐波和障碍物穿透）的准确性和信噪比（SNR）。通常，与FMCW雷达相比，IR-UWB雷达具有更高的精度和更高的SNR。但是，每个雷达系统都有其独特的优势，IR-UWB展现出更少的谐波和更高的SNR，而FMCW可以组合来自每个信道的结果。