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Michael Jensen

at Widener Univ.

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Proceedings Article | 10 June 2024 Presentation + Paper

MIMO radar-based vital sign monitoring by slow-time over sampling

Mason Calderbank, Michael Jensen, Daniel Creighton, Daniel Smith, Syed Hamza

Proceedings Volume 13036, 130360K (2024) https://doi.org/10.1117/12.3013567

KEYWORDS: Vital signs, Radar, Radar signal processing, Heart, Chest, Data processing, Tunable filters, Matrices, Spatial filtering, Signal processing

Read Abstract +

Traditional clinical vital sign measurement methods are often contact-based, causing discomfort for patients and practitioners and rendering it inconvenient for continuous monitoring. Additionally, close proximity during measurement poses the risk of disease transmission and allows only one patient to be monitored at a time. To address these challenges, contactless measurement methods are being explored, with radar technology emerging as a promising alternative for vital sign monitoring. The proposed design utilizes a MIMO radar system to remotely detect subtle chest movements caused by breathing and heartbeat. The primary challenge lies in separating weaker heartbeat movements from stronger breathing motions, in the presence of body movements which mask the chest movements due to vital signs. We employ filtering techniques and chirp averaging using slow-time oversampling to enable the precise estimation of breathing and heartbeat patterns. We collect radar vital sign data from various individuals with different resting heart rates in a controlled lab environment. The system’s performance is evaluated by comparing it with ground truth information obtained from pulse oximeter.

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