Development of a Stand-Alone Physiological Monitoring System for Noncontact Heart and Respiration Rate Measurements on Real-Time Linux Platform
We developed a stand-alone physiological monitoring system without any constraints on its users for daily life healthcare. The system measures tiny movements on a body surface induced by heartbeat and respiration in a noncontact manner using a 24-GHz microwave radar. To extract the related signals from the radar output, an analog band pass filter was designed and integrated into a printed circuit board. The software was developed on an embedded Linux platform for a stand-alone and modular design. To assess the performance of noncontact physiological monitoring, we conducted a laboratory test on eight healthy male subjects (ages: 22.0 ± 1.25 years). The heart and respiration rates determined by the proposed system correlated significantly with those measured by the contact-type electrocardiogram (r = 0.83, p < 0.01) and respiratory effort belt (r = 0.90, p < 0.01). The results showed that the respiration and heartbeat were accurately detected by the proposed system, which appears promising for monitoring physiological condition in daily life.
KeywordsMedical radar noncontact biomeasurement heart rate respiration real-time Linux
Unable to display preview. Download preview PDF.