Non-contact vital sign detection method based on phase comparison

The invention provides a non-contact vital sign detection method based on phase comparison, which comprises the following steps: a signal source transmits two sinusoidal signals with the same amplitude, the same phase and the same frequency, one signal is transmitted to a thoracic cavity through a transceiving antenna and then is echo to an amplitude-phase comparison module, and the other signal is directly input to the amplitude-phase comparison module; the amplitude-phase comparison module compares the phase difference and the amplitude difference of the two paths of signals, converts the change of the phase difference and the change of the amplitude difference into the change of two paths of voltage and outputs the change; and the relationship between the change frequency and the change amplitude of the two paths of voltage and the breathing/heartbeat frequency and intensity through a mathematical model is obtained, and the detected breathing/heartbeat is output. 本发明提出了一种基于相位比较的非接触式生命体征检测方法，包括：信号源发射两路同幅度同相