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Feasibility of Radar Vital Sign Monitoring Using Multiple Range Bin Selection.

Benedek Szmola^1,2,3, Lars Hornig³, Karen Insa Wolf³

¹Department of Neurology, School of Medicine and Health Science, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany.

Sensors (Basel, Switzerland)

|April 26, 2025

Summary

This summary is machine-generated.

Contactless vital sign monitoring using radar is enhanced by selecting multiple breathing and heartbeat signals. This method improves accuracy and reduces artifacts compared to single-signal selection.

Keywords:

chirp median lateral placement multiple range bin selection persistence diagram radar sleep monitoring time delay embedding topological data analysis vital sign monitoring

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Area of Science:

Biomedical Engineering
Medical Devices
Signal Processing

Background:

Radars offer promising contactless vital sign monitoring.
They can supplement polysomnography for sleep studies.
Simultaneous vital sign extraction from multiple body parts is possible.

Purpose of the Study:

To present a novel method for selecting multiple breathing and heartbeat signals.
To enhance vital rate robustness and accuracy using concurrent signals.
To improve contactless vital sign monitoring.

Main Methods:

Developed an algorithm using persistence diagrams from topological data analysis.
Evaluated multiple criteria on persistence diagrams to detect vital signals.
Tested on simultaneous overnight radar and polysomnography recordings.

Main Results:

Multiple signal selection improved breathing accuracy (MAE 0.20 vs. 0.29 breaths/min).
Multiple signal selection improved heart rate accuracy (MAE 0.66 vs. 1.97 beats/min).
Fewer artifactual segments were selected, and signal distribution aligned with physiology.

Conclusions:

Contactless vital sign monitoring benefits from improved accuracy via multiple signal selection.
This approach enhances robustness and reduces errors in radar-based monitoring.
Distribution of vital signs may offer additional sleep monitoring insights.