Key result
Remote FMCW radar estimates heart rate with lower error and ~2.5s measurement time vs ECG.
Why the study?
Methods to reduce measurement time for remote heart rate measurement using millimeter-wave FMCW radar were needed.
Does the proposed FMCW radar method improve heart rate measurement accuracy and reduce measurement time compared to ECG and conventional methods in human subjects?
Does the proposed FMCW radar method improve heart rate measurement accuracy and reduce measurement time compared to ECG and conventional methods in human subjects?
A novel FMCW radar-based method enables accurate, short-time (2.5 s) remote heart rate measurement, outperforming conventional signal processing approaches.
May enable contactless monitoring; leaves open validation in larger trials before clinical adoption.
This letter presents a novel method to reduce measurement time for remote heart rate measurement using millimeter-wave frequency-modulated continuous wave (FMCW) radar. The proposed method is based on the sampling theory and the frame structure of recent FMCW radar systems. The range displacement from heartbeat is measured by 60 GHz FMCW radar with a fixed frame interval, 50 ms. With additional chirp repetition in each frame, the heartbeat signal can be sampled with increased or decreased interval. By adopting three different sampling rates from a single radar measurement, the resolution of heart rate measurement is improved in a short time, 2.5 s. The proposed method is evaluated with a commercial off-the-shelf FMCW radar system and three different human subjects, for no respiration and natural status. To evaluate the performance of the proposed method, the heart rate result is compared with electrocardiogram (ECG) sensor and conventional signal processing method. The results show that the proposed method estimates the heart rate with lower error and shorter measurement time.
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Jung et al. (2023) studied this question. 60 GHz FMCW radar with multiple sampling rates vs. Electrocardiogram (ECG) sensor and conventional signal processing method was evaluated on Heart rate measurement error and measurement time. Remote heart rate measurement using a 60 GHz FMCW radar estimated heart rate with lower error and shorter measurement time (2.5 s) compared to ECG and conventional signal processing methods.
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