Aiming at the problem of weak signal and noise in non-contact human body sign detection

amplification and filtering circuits are designed to achieve signals amplification and de-noising function. High precision analog to digital converter（ ADC） is used to acquire signals

and MATLAB is used to process signals. The obtained electrical characteristics are used to calculate the body signs in reverse. Experimental result shows that the designed human body signs detection device can effectively detect the breathing and heartbeat of a single stationary human body

and the maximum effective working distance is 100 cm.