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首页> 外文期刊>Instrumentation and Measurement, IEEE Transactions on >Instrument-Based Noncontact Doppler Radar Vital Sign Detection System Using Heterodyne Digital Quadrature Demodulation Architecture
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Instrument-Based Noncontact Doppler Radar Vital Sign Detection System Using Heterodyne Digital Quadrature Demodulation Architecture

机译：基于外差数字正交解调架构的基于仪器的非接触式多普勒雷达生命体征检测系统

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摘要

In this paper, we present a fast solution to build a Doppler radar system for noncontact vital sign detection (VSD) using instruments that are generally equipped in radio-frequency and communication laboratories. This paper demonstrates the feasibility of conducting research on VSD in ordinary radio-frequency laboratories. The system is designed with a heterodyne digital quadrature demodulation architecture that helps mitigate quadrature channel imbalance and eliminate the complicated dc offset calibration required for arctangent demodulation. Moreover, its tunable carrier frequency helps select different optimal frequencies for different human objects. Two sets of extensive experiments have been carried out in the laboratory environment with a self-designed 2.4-GHz patch antenna array and a 1–18-GHz broadband antenna. The test results are satisfactory: for a 0-dBm transmit power, the detection range can be extended to 2.5 m with accuracy higher than 80%. The system is also capable of detecting vital signs in the presence of different obstructions between the subject and the antenna.
机译：在本文中，我们提出了一种快速解决方案，可以使用射频和通信实验室中通常配备的仪器来构建用于非接触式生命体征检测（VSD）的多普勒雷达系统。本文证明了在普通射频实验室中进行VSD研究的可行性。该系统采用外差数字正交解调架构设计，有助于减轻正交信道不平衡并消除反正切解调所需的复杂直流偏移校准。此外，其可调的载波频率有助于为不同的人体选择不同的最佳频率。在实验室环境中，使用自行设计的2.4 GHz贴片天线阵列和1–18 GHz宽带天线，进行了两组广泛的实验。测试结果令人满意：对于0 dBm的发射功率，检测范围可以扩展到2.5 m，精度高于80％。该系统还能够在对象和天线之间存在不同障碍物的情况下检测生命体征。

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