A Computational Approach to Increasing the Antenna System's Sensitivity in a Doppler Radar Designed to Detect Human Vital Signs in the UHF-SHF Frequency Ranges.

IF 3.4 3区 综合性期刊 Q2 CHEMISTRY, ANALYTICAL
Sensors Pub Date : 2025-05-21 DOI:10.3390/s25103235
David Vatamanu, Simona Miclaus
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引用次数: 0

Abstract

In the context of Doppler radar, studies have examined the changes in the phase shift of the S21 transmission coefficient related to minute movements of the human chest as a response to breathing or heartbeat. Detecting human vital signs remains a challenge, especially when obstacles interfere with the attempt to detect the presence of life. The sensitivity of a measurement system's perception of vital signs is highly dependent on the monitoring systems and antennas that are used. The current work proposes a computational approach that aims to extract an empirical law of the dependence of the phase shift of the transmission coefficient (S21) on the sensitivity at reception, based upon a set of four parameters. These variables are as follows: (a) the frequency of the continuous wave utilized; (b) the antenna type and its gain/directivity; (c) the electric field strength distribution on the chest surface (and its average value); and (d) the type of material (dielectric properties) impacted by the incident wave. The investigated frequency range is (1-20) GHz, while the simulations are generated using a doublet of dipole or gain-convenient identical Yagi antennas. The chest surface is represented by a planar rectangle that moves along a path of only 3 mm, with a step of 0.3 mm, mimicking respiration movement. The antenna-target system is modeled in the computational space in each new situation considered. The statistics illustrate the multiple regression function, empirically extracted. This enables the subsequent building of a continuous-wave bio-radar Doppler system with controlled and improved sensitivity.

一种提高超高频-高频人体生命体征多普勒雷达天线系统灵敏度的计算方法。
在多普勒雷达的背景下,研究已经检查了与人体胸部微小运动相关的S21透射系数相移的变化,作为对呼吸或心跳的反应。探测人类生命体征仍然是一项挑战,特别是当障碍物干扰了探测生命存在的努力时。测量系统对生命体征感知的灵敏度高度依赖于所使用的监测系统和天线。目前的工作提出了一种计算方法,旨在基于一组四个参数提取传输系数(S21)的相移对接收灵敏度的依赖的经验规律。这些变量如下:(a)所利用的连续波的频率;(b)天线类型及其增益/指向性;(c)胸部表面电场强度分布(及其平均值);(d)受入射波影响的材料类型(介电性能)。所研究的频率范围为(1-20)GHz,而模拟是使用偶极子偶极子或增益方便的相同八木天线产生的。胸部表面由一个平面矩形表示,该矩形沿仅3毫米的路径移动,步长为0.3毫米,模仿呼吸运动。在计算空间中对每一种新情况下的天线目标系统进行建模。统计说明多元回归函数,经验提取。这使得后续构建具有可控和改进灵敏度的连续波生物雷达多普勒系统成为可能。
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
Sensors
Sensors 工程技术-电化学
CiteScore
7.30
自引率
12.80%
发文量
8430
审稿时长
1.7 months
期刊介绍: Sensors (ISSN 1424-8220) provides an advanced forum for the science and technology of sensors and biosensors. It publishes reviews (including comprehensive reviews on the complete sensors products), regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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