In this study, we present a quantitative evaluation of the accuracy of simultaneous array-radar-based measurements of the displacements caused at two parts of the human body by arterial pulse wave propagation. To establish the feasibility of accurate radar-based noncontact measurement of this pulse wave propagation, we perform experiments with four participants using a 79-GHz millimeter-wave ultra-wideband multiple-input multiple-output array radar system and a pair of laser displacement sensors. We evaluate the accuracy of the pulse wave propagation measurements by comparing the displacement waveforms that are measured using the radar system with the corresponding waveforms that are measured using the laser sensors. In addition, to evaluate the estimates of the pulse wave propagation channels, we compare the impulse response functions that are calculated from the displacement waveforms obtained from both the radar data and the laser data. The displacement waveforms and the impulse responses both demonstrated the good agreement between the results of the radar and laser measurements. The normalized correlation coefficient between the impulse responses obtained from the radar and laser data on average was as high as 0.97 for the four participants. The results presented here strongly support the feasibility of accurate radar-based noncontact measurement of arterial pulse wave propagation.

中文翻译：

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使用79 GHz阵列雷达进行精确非接触式动脉脉搏位移测量的实验演示

在这项研究中，我们提出了对基于阵列雷达的同时测量由动脉脉搏波传播在人体两部分引起的位移的准确性的定量评估。为了确定对该脉冲波传播进行基于雷达的非接触式精确测量的可行性，我们使用79 GHz毫米波超宽带多输入多输出阵列雷达系统和一对激光位移传感器与四个参与者进行了实验。我们通过比较使用雷达系统测量的位移波形和使用激光传感器测量的相应波形来评估脉搏波传播测量的准确性。另外，为了评估脉搏波传播通道的估计，我们比较了根据从雷达数据和激光数据获得的位移波形计算出的脉冲响应函数。位移波形和脉冲响应都证明了雷达和激光测量结果之间的良好一致性。对于四个参与者，从雷达获得的脉冲响应与激光数据之间的归一化相关系数平均高达0.97。本文介绍的结果有力地支持了基于雷达的精确非接触式动脉脉搏波传播测量的可行性。对于四个参与者，从雷达获得的脉冲响应与激光数据之间的归一化相关系数平均高达0.97。本文介绍的结果有力地支持了基于雷达的精确非接触式动脉脉搏波传播测量的可行性。对于四个参与者，从雷达获得的脉冲响应与激光数据之间的归一化相关系数平均高达0.97。本文介绍的结果有力地支持了基于雷达的精确非接触式动脉脉搏波传播测量的可行性。