研究目的
To develop a contactless and ubiquitous vital sign monitoring system for drivers using an impulse ultra-wide band (UWB) radar to detect minute chest movements for breathing rate estimation.
研究成果
The paper demonstrates the feasibility of using UWB radar for contactless breathing rate monitoring in vehicles. The rear view mirror position is identified as optimal for robust breathing rate estimation. On-road experiments achieve a mean estimation error of 1.06 breaths per minute, indicating the system's potential for early detection of health issues during driving.
研究不足
The study is limited by the sensitivity of UWB signals to body motions and vehicle vibrations, which can interfere with signal propagation and downgrade estimation performance. The system's performance may also vary with the driver's height and BMI.
1：Experimental Design and Method Selection:
The study utilizes UWB radar for detecting minute chest movements to estimate breathing rate. Two signal processing methods (on-line and off-line) are designed for analysis.
2：Sample Selection and Data Sources:
Four driver participants (3 males and 1 female) aged 29 to 55 with BMI from 20.7 to 28.3 are involved in the experiments.
3：7 to 3 are involved in the experiments.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Xethru X2M200 impulse UWB radar, USB pressing button for ground truth data collection, and a laptop host for data alignment.
4：Experimental Procedures and Operational Workflow:
Experiments include testing 16 different radar positions in a vehicle, collecting breathing data with subjects performing regular driving behaviors, and on-road tests under various driving conditions.
5：Data Analysis Methods:
The study employs fast Fourier transform algorithm (FFT) for frequency domain analysis and custom narrow band-pass filter for off-line analysis. A moving sliding window is applied for on-line real-time monitoring.
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