Detection method for vital signs of human body target

The invention discloses a detection method for vital signs of a human body target, which comprises the following steps: firstly, establishing a radar human body target echo signal model containing a micro-doppler effect; performing time-frequency analysis, thereby obtaining time-frequency energy distribution of the echo signal; optimizing the time-frequency energy distribution, thereby obtaining a centroid curve; and performing time-frequency analysis again, thereby extracting heartbeat frequency and breathing frequency. According to the detection method provided by the invention, the vital sign information of the human body target is confirmed by detecting doppler information of a terahertz radar echo; the echo signal is treated by repeatedly utilizing a time-frequency analysis method; the micro-moving information, such as heartbeat and breath, is lastly extracted; various inconveniences brought by contact detection are solved; and the quick heartbeat and breath detection can be performed on the human body target within a certain distance according to the detection method.