With a communication distance of up to 60 m (120 m with external antenna), the person does not necessarily have to even be inside the substation perimeter, so saving the need to arrange entry permits or have electrically trained personnel perform the work. It enables accurate and long-term heartbeat monitoring, which has wide applications in clinical space and daily life.Remote reading provides increased personnel safety compared with conventional counters. Our work provides effective solutions to some obstacles in practical applications of contactless heartbeat monitoring. It has strong robustness to different individuals in different postures and positions. RF-Heartbeat achieves a higher performance than state-of-the-art heartbeat monitoring systems. In the heartbeat monitoring experiment for a total of 72 hours and 56 minutes involving 10 participants, under a time coverage of 91.2%, the median error of IBI was 12 ms. Then, a global optimization model based on a template matching algorithm is implemented for improving IBI estimation accuracy. RF-Heartbeat has novel signal process modules, including BMs detection method, and optimal range bin selection method, for obtaining a relatively high-quality heartbeat signal. We propose RF-Heartbeat, a robust heartbeat monitoring system based on milimeter-wave FMCW radar. The inter-beat interval (IBI) estimation need to be further improved. Range bin selection methods in existing work are not robust enough.

Tiny vibration caused by heartbeat could be easily interrupted by body movements (BMs) and so on. However, there are plenty of limitations in related work based on it. The unique advantages of milimeter-wave frequency-modulated continous-wave (FMCW) radar over other wireless devices draw our attention. As a contactless approach, it can relieve users from wearing sensors.

The past decade has witnessed wireless heartbeat monitoring becoming more and more feasible.

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