Noncontact Heartbeat and Respiratory Signal Separation Using a Sub 6 GHz SDR Micro-Doppler Radar

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Chao Ma;Quan Shi;Bing Hua;Yongwei Zhang;Zhihuo Xu;Liu Chu;Robin Braun;Jiajia Shi
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引用次数: 0

Abstract

Software-defined radio (SDR) can be used to detect human respiratory and heartbeat signals with the merits of low costs, high flexibility, and fast implementation. This paper proposes a human respiratory heartbeat detection system based on SDR micro-Doppler radar. The system can adjust radar parameters in real-time according to the detection environment, breaking the hardware limitations of traditional radar. Data pre-processing is performed on the transmit and receive baseband signals to obtain a composite signal containing human respiratory and heartbeat signals. In addressing the difficulty of detecting heartbeat signals compared to respiratory signals, an adaptive heartbeat signal enhancement detection algorithm named the one-time differential weighted step-size normalized least mean square (ODWS-NLMS) is proposed. This algorithm enhances the step size through weighted improvements utilizing the first-order differential characteristics of composite signals. Experiments were conducted in three distinct real-world environments, and the results indicate that the proposed algorithm outperforms discrete wavelet transform (DWT) and ensemble empirical mode decomposition (EEMD) in terms of average accuracy, root mean square error (RMSE), and signal-to-noise ratio (SNR).
使用 6 GHz 以下 SDR 微多普勒雷达进行非接触式心跳和呼吸信号分离
软件定义无线电(SDR)可用于检测人体呼吸和心跳信号,具有成本低、灵活性高、实施速度快等优点。本文提出了一种基于 SDR 微多普勒雷达的人体呼吸心跳检测系统。该系统可根据检测环境实时调整雷达参数,打破了传统雷达的硬件限制。系统对发射和接收的基带信号进行数据预处理,得到包含人体呼吸和心跳信号的复合信号。针对心跳信号比呼吸信号更难检测的问题,提出了一种自适应心跳信号增强检测算法,名为一次性差分加权步长归一化最小均方(ODWS-NLMS)。该算法利用复合信号的一阶差分特性,通过加权改进来增强步长。实验在三个不同的真实世界环境中进行,结果表明,就平均准确度、均方根误差(RMSE)和信噪比(SNR)而言,所提出的算法优于离散小波变换(DWT)和集合经验模式分解(EEMD)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.40%
发文量
58
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