Experimental Study of 24GHz Sense2Gol Pulse Radar Sensor for Human Vital Sign Measurement

Noncontact sensor based vital sign measurement has gained predominant attention in recent years. Frequency Modulated Continuous Wave (FMCW) radar-based sensors are deployed for this purpose at millimetre (mm) wavelengths (typically, 60 GHz and 77 GHz) to obtain vital sign measurements for various applications. This paper proposes a 24GHz Sense2Gol radar sensor-based heart rate (HR) and breath rate (BR) measurement system. Real data is collected using experimental setup from 12 male subjects and 12 female subjects of various age groups (with average age of male subjects is 40.5 years and average age of female subjects is 37.4 years). The data from the I/Q channel of the Sense2Gol radar sensor is passed through a band-pass filter followed by evaluating fast Fourier transform (FFT) to determine the HR beat per minute (bpm). To estimate the BR the arc tangent demodulation, phase unwrapping, followed by band-pass filtering is performed. The FFT is carried out for the resultant signal. The practical results from this experiment reveals that the male subjects and female subjects have an average value (HR: 63.92 bpm for male,64.97 bpm for female; BR:17.38 bpm for male, 17.45 bpm for female) of HR and BR respectively for male and female candidates. Further, over all HR across all subjects (both male and female) is 64.44 and BR across all subjects is 17.41. This Sense2Gol pulse radar sensor is relatively inexpensive among other sensors of this class and the data can be transferred using micro controller and an IoT module to nearest health care centers.