Method and device for measuring biometric signal by using radar

A method of measuring a biometric signal by using a radar, wherein the method measures a first biometric signal and a second biometric signal by using the radar, the method comprising:

• (a) receiving, from the radar, a plurality of biometric signals including the first biometric signal and the second biometric signal, the first biometric and second biometric signals being a reflected signal reflected from a respective reflection point;
• (b) calculating a respective distance between the respective reflection point and the radar associated with each of the plurality of biometric signals, and classifying the plurality of biometric signals into multiple groups on the basis of the respective distances thus calculated;
• (c) selecting biometric signals having a variance greater than a predetermine variance as a function of time from the multiple groups of the plurality of biometric signals thus classified on the basis of the respective distance in the step (b);
• (d) selecting, further, from the multiple groups of the plurality of biometric signals thus selected in the step (b), a number of biometric signals having respective calculated distances smaller than a predetermined distance associated with the biometric signal selected in the step (c);
• (e) converting the selected biometric signals of step (c) and the selected biometric signals of step (d) from a time domain to a frequency domain;
• (f) calculating a reliability of the first biometric signal and a reliability of the second biometric signal from the biometric signals converted in the step (e);
• (g) determining the first biometric signal as a biometric signal having a highest reliability as calculated in the step (f) within a first frequency band;
• and
• (h) determining the second biometric signal as a biometric signal having a highest reliability as calculated in the step (f) within a second frequency band.