Radius Correction Technique for Doppler Radar Noncontact Periodic Displacement Measurement
Radius Correction Technique for Doppler Radar Noncontact Periodic Displacement Measurement
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DOI：
10.1109/tmtt.2016.2625796
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发表时间：
2017-02-01
影响因子：
4.3
通讯作者：
Boric-Lubecke, Olga
中科院分区：
文献类型：
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作者：
Gao, Xiaomeng;Boric-Lubecke, Olga
使用多普勒雷达的非接触式生理监测已被广泛研究。最常见的是，连续波（CW）正交多普勒雷达用于测量心肺心率。准确的位移测量可以提供生理波形恢复，这可以实现潮气量和脉压估计。在本文中，我们提出了一种校准技术，使高精度毫米阶周期性位移测量使用CW正交多普勒雷达。对中心估计误差及其传播效应进行了理论分析。仿真结果表明，噪声和有限的弧长如何影响误差和影响中心估计的准确性，以及校准后的改进。采用高精度直线工作台产生周期运动，对标定技术的性能进行了评价。实验结果表明，所提出的校准技术，使位移测量精度在几十微米。
Noncontact physiological monitoring using Doppler radar has been studied extensively. Most commonly, continuous-wave (CW) quadrature Doppler radar is used to measure cardiopulmonary rates. Accurate displacement measurement can provide physiological waveform recovery, which may enable tidal volume and pulse pressure estimation. In this paper, we propose a calibration technique that enables high-accuracy millimeter-order periodic displacement measurements using CW quadrature Doppler radar. Theoretical analysis of center estimation error and its propagation effect are presented. Simulations are performed to show how noise and limited arc length affect error and affect the accuracy of center estimation, as well as improvements after calibration. A high-precision linear stage was employed to create periodic motion for evaluating the performance of calibration technique. Experimental results demonstrate that the proposed calibration technique enables displacement measurement with accuracy within tens of micrometers.