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Real-Time Heart Rate Detection Method Based on 77 GHz FMCW Radar
Xiaohong Huang1,2, Zedong Ju1,2, Rundong Zhang3
1College of Artificial Intelligence, North China University of Science and Technology, Tangshan 063210, China.
Micromachines
|November 24, 2022
Summary
This study presents a novel radar method for accurate, real-time heart rate detection. The technique effectively removes motion interference and respiratory harmonics for improved vital sign monitoring.
Area of Science:
- Biomedical Engineering
- Radar Signal Processing
- Physiological Monitoring
Background:
- Accurate real-time heart rate monitoring is crucial for medical diagnostics.
- Existing methods can be affected by motion artifacts and respiratory interference.
- Non-contact vital sign detection offers advantages in certain clinical scenarios.
Purpose of the Study:
- To propose a novel real-time heart rate detection method using 77 GHz FMCW radar.
- To develop techniques for eliminating random body motion (RBM) and respiratory harmonics.
- To achieve high accuracy in heart rate detection in the presence of interference.
Main Methods:
- Development of a new motion model based on respiratory and heartbeat rules.
- Extraction of chest and abdominal motion signals.
- Elimination of RBM using polynomial fitting and recursive least squares (RLS) adaptive filtering.
- Suppression of respiratory harmonics via multi-detection-point adaptive harmonics cancellation (AHC).
- Application of a linear predictive coding (LPC) based spectrum analysis algorithm.
Main Results:
- Effective elimination of random body motion (RBM) signals.
- Successful cancellation of respiratory harmonics.
- Achieved an average real-time heart rate detection error rate of 2.925%.
- Demonstrated the feasibility of non-contact heart rate monitoring.
Conclusions:
- The proposed radar-based method provides accurate and reliable real-time heart rate detection.
- The integrated signal processing techniques effectively address common sources of error.
- This approach holds potential for advanced non-contact physiological monitoring systems.
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