Assessment of Doppler Radar Demodulation Techniques for Accurate Characterization of Cardiorespiratory Signals

IF 4.5 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2025-03-29 DOI:10.1109/TMTT.2025.3570194

Mohammad Shadman Ishrak;Jannatun Noor Sameera;Olga Borić-Lubecke;Victor M. Lubecke

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引用次数: 0

Abstract

Doppler radar systems can demonstrably provide accurate measurement of physiological motion for sedentary and partially sedentary subjects. In this research, quadrature and single-channel demodulation techniques are evaluated and their performance is compared for the extraction of vital-signs-related displacement and rate information from clutter and noise. Computational complexity, degree of displacement waveform correlation, and spectral analysis resolution are taken into account. The demodulation techniques were tested by synthesizing realistic cardiorespiratory motion using a robotic mover, and with human data. Arctangent demodulation (AD) and linear demodulation (LD) were demonstrated to be computationally more efficient than the other methods, and AD provided phase information needed for accurate quantitative tracking of the measured displacement waveform. Divide and cross multiply (DACM) methods were found to have a greater resilience against noise when recovering cardiac rate information, while discrete cosine transform (DCT) methods demonstrated greater frequency resolution over shorter segments of data when making respiratory measurements. These findings provide important guidance when selecting a demodulation method that is best suited for a particular measurement system or application.

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评价多普勒雷达解调技术对心肺信号的准确表征

多普勒雷达系统可以为久坐和部分久坐的受试者提供精确的生理运动测量。在本研究中，评估了正交解调和单通道解调技术，并比较了它们在从杂波和噪声中提取与生命信号相关的位移和速率信息方面的性能。考虑了计算复杂度、位移波形相关程度和频谱分析分辨率。解调技术通过使用机器人移动器合成真实的心肺运动和人类数据进行了测试。arctan解调（AD）和线性解调（LD）的计算效率比其他方法高，并且arctan解调提供了精确定量跟踪测量位移波形所需的相位信息。在恢复心率信息时，发现除法和交叉乘法（DACM）方法具有更大的抗噪声弹性，而在进行呼吸测量时，离散余弦变换（DCT）方法在较短的数据段上显示出更高的频率分辨率。这些发现为选择最适合特定测量系统或应用的解调方法提供了重要的指导。

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

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.