Abstract: Aiming at the inherent limitations and inconveniences of the contact and wearable vital signs measurement tools, and low accuracy of the low frequency mmWave, a non-contact vital signs measurement method based on high-frequency frequency-modulated continuous wave (FMCW) is put forward. By mixing the FMCW’s transmitting and receiving waves, the difference frequency signals and its center frequency are obtained. The distance and speed information of the target is derived from the center frequency. By comparing the heart rate test with two hand rings, it is found that the maximum error is 6.7% and the maximum standard deviation is 3.55277. The maximum errors of the static target with different clothing, the moving target with the same clothing and the moving target with different clothing were 4.5%, 7.2% and 7.7%, respectively.

Key words: mmWave radar, non-contact, vital signs, FMCW, high-frequency