A consideration on a multi-dimensional non-contact vital sensing using Doppler sensor

Abstract

Non-contact vital sensing is gathering attention associated with the development of Doppler sensors. It radiates an electromagnetic wave and receives the reflected waves yielded by a human body. Then it detects the frequency deviation by comparing the transmitted wave with the received wave. Since this frequency deviation is caused by the Doppler effect along with the movement of the body surface, we can detect vital signs such as heartbeat, breathing and body movement, through signal processing. We have proposed a new and unique signal processing scheme for the non-contact vital sensing using Doppler sensors. The uniqueness of the proposed method is summarized as follows: (1) It enables a Doppler sensor to cope with multiple human bodies, (2) It detects the direction of the multiple human bodies as well as the other vital signs. This paper provides in-depth performance verification through computer simulations.