A 2.4 GHz non-contact Doppler radar system achieved 88% accuracy in classifying motion signals, with mean absolute errors of 0.8 beats/min for heart rate and 3.5 beats/min for respiratory rate.
Does a 2.4 GHz Doppler radar system accurately measure heart rate, respiratory rate, and body movement compared to contact equipment?
A 2.4 GHz Doppler radar system can accurately monitor heart rate, respiratory rate, and body movement in a non-contact manner.
With the rapid increase in the development of miniaturized sensors and embedded devices for vital signs monitoring, personal physiological signal monitoring devices are becoming popular. However, physiological monitoring devices which are worn on the body normally affect the daily activities of people. This problem can be avoided by using a non-contact measuring device like the Doppler radar system, which is more convenient, is private compared to video monitoring, infrared monitoring and other non-contact methods. Additionally real-time physiological monitoring with the Doppler radar system can also obtain signal changes caused by motion changes. As a result, the Doppler radar system not only obtains the information of respiratory and cardiac signals, but also obtains information about body movement. The relevant RF technology could eliminate some interference from body motion with a small amplitude. However, the motion recognition method can also be used to classify related body motion signals. In this paper, a vital sign and body movement monitoring system worked at 2.4 GHz was proposed. It can measure various physiological signs of the human body in a non-contact manner. The accuracy of the non-contact physiological signal monitoring system was analyzed. First, the working distance of the system was tested. Then, the algorithm of mining collective motion signal was classified, and the accuracy was 88%, which could be further improved in the system. In addition, the mean absolute error values of heart rate and respiratory rate were 0.8 beats/min and 3.5 beats/min, respectively, and the reliability of the system was verified by comparing the respiratory waveforms with the contact equipment at different distances.
Liang et al. (Fri,) conducted a other in Physiological signal and body movement monitoring. 2.4 GHz Doppler radar system vs. Contact equipment was evaluated on Accuracy of collective motion signal classification. A 2.4 GHz non-contact Doppler radar system achieved 88% accuracy in classifying motion signals, with mean absolute errors of 0.8 beats/min for heart rate and 3.5 beats/min for respiratory rate.
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