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Noncontact Multiperson Respiration Detection Using Time-Modulated Array
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DOI：10.1109/JSEN.2025.3589182.png)
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Abstract
En 中文
Radio frequency (RF) sensing has been commonly employed in health monitoring because of its advantages of noncontact, wide coverage, and privacy protection. Respiratory monitoring within multiperson environments has emerged as a prominent research area and poses significant challenges in the field of RF sensing. Current approaches to multiperson respiratory monitoring primarily depend on the inherent resolution of sensing devices, such as range and angular resolution. To address this limitation, this article proposes a novel single-channel method for multiperson respiration detection based on a time-modulated array (TMA). The TMA is employed to generate multiple harmonic beams, enabling the simultaneous detection of human respiration from multiple directions. Each harmonic component is extracted through a series of digital downconversion (DDC) operations applied to the received single-channel signal. The respiratory signal of each individual is then obtained by analyzing the phase information of the corresponding harmonic component. A multiperson respiratory monitoring system was designed and implemented using a 2.4 GHz TMA continuous-wave (CW) radar prototype. The system features a simple architecture and low computational complexity. In experiments of single-person, two-person, and three-person scenarios, the maximum respiratory rate (RR) estimation errors are 0.59, 0.98, and 1.30 bpm, respectively. The proposed system can accurately detect the RRs of three individuals simultaneously and effectively identify abnormal breathing patterns among them, demonstrating its capability to monitor health status in daily multiperson scenarios.
Keywords:
Multiperson
radio frequency (RF) sensing
respiratory monitoring
time-modulated array
Journal
IF:
4.5
Papers:
2.1W
Citations:
7.3W
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