Vital Signal Detection Using Multi-Radar for Reductions in Body Movement Effects
Ah-Jung Jang1, In-Seong Lee1, Jong-Ryul Yang1
1Department of Electronic Engineering, Yeungnam University, Gyeongsan 38541, Korea.
Sensors (Basel, Switzerland)
|November 13, 2021
Summary
This study introduces a novel radar technique using multiple sensors to accurately detect vital signs, even during body movement. The method enhances signal clarity by correlating data from radars with different lines-of-sight, improving detection accuracy.
Area of Science:
- Biomedical Engineering
- Radar Systems
- Signal Processing
Background:
- Vital sign monitoring is crucial for healthcare.
- Body movement during monitoring can degrade signal quality.
- Existing radar methods struggle with movement artifacts.
Purpose of the Study:
- To develop a radar-based vital signal detection system robust to body movement.
- To improve signal-to-noise ratio (SNR) in vital sign detection.
- To leverage multiple radars with different lines-of-sight (LOS) for enhanced accuracy.
Main Methods:
- Utilized continuous-wave (CW) radar systems operating at different frequencies (5.8 GHz band) to minimize signal coupling.
- Employed two adjacent radars with distinct LOS to capture asymmetrical organ movement (lungs, heart).
- Developed a correlation technique to reinforce differences in movement signals, reducing noise.
Main Results:
- The proposed multi-radar system achieved a mean accuracy of 97.8% in vital sign detection.
- Successfully monitored subjects moving at velocities up to 53.4 mm/s.
- Demonstrated significant reduction in body movement effects on vital signal detection.
Conclusions:
- The multi-radar approach effectively mitigates signal degradation caused by body movement.
- Correlating signals from radars with different LOS enhances vital sign detection accuracy.
- This method offers a promising non-contact solution for remote vital sign monitoring.
