Seat-Occupancy Detection System and Breathing Rate Monitoring Based on a Low-Cost mm-Wave Radar at 60 GHz

This work presents a seat-occupancy detection system based on a PCR (Pulsed Coherent Radar) at the unlicensed 60 GHz ISM band. The radar can measure distances with sub-millimeter resolution. Therefore, the system can detect the presence of people occupying the seats by measuring small movements of t...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.115403-115414
Main Authors: Lazaro, Antonio, Lazaro, Marc, Villarino, Ramon, Girbau, David
Format: Article
Language:English
Subjects:
Air flow
Amplitudes
Automobiles
Automotive radar
breathing monitoring
Coherent radar
detection
Doppler radar
Emulators
Millimeter waves
mm-wave radar
Monitoring
Occupancy
Radar
Radar cross-sections
Radar detection
seat occupancy
Seats
Sensors
vital-sign monitoring
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Summary:This work presents a seat-occupancy detection system based on a PCR (Pulsed Coherent Radar) at the unlicensed 60 GHz ISM band. The radar can measure distances with sub-millimeter resolution. Therefore, the system can detect the presence of people occupying the seats by measuring small movements of the body, such as those produced by breathing. In consequence, the system not only measures seat-occupancy but also breathing rate, which is estimated from the amplitude peaks after filtering the amplitude measured by the radar to remove the noise. The effect of the car vibrations and random body movement is experimentally studied. Measurements performed with adults, as well as with a baby emulator sitting in a child seat, are presented. Comparison of the system with another that measures the breath based on airflow shows good agreement and permits its validation.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3105390