Contactless Non-Line of Sight Respiration Rate Monitoring Using FMCW Radar

Many medical systems monitor individuals in daily life but often require patients to wear devices, which can be uncomfortable and impractical for long-term use. A contactless approach to vital sign monitoring is, therefore, more desirable. Our team has developed an innovative Non-Line-of-Sight (NLOS) FMCW radar system capable of detecting vital signs and supporting various other applications. We demonstrated that this radar-based sensor effectively monitors respiration in real-world settings with stationary targets. Comparisons with ground truth data for a single user, in both the time and frequency domains against ECG ground truth, show that our radar system achieves 100% higher accuracy in measuring breathing rates (BPM).