A versatile through-the-wall doppler radar using BSS algorithms

Doppler heart sensing radar has been developed for various healthcare and personnel detection applications. For through-the-wall sensing of personnel, the radar operator´s cardiopulmonary activity may be detected due to reflection of the radar signal at the wall. This heart-motion signal may be considerably stronger than that from the subject of interest behind the wall. This paper presents a calculation of signal power expectations for detecting heart motion of both the radar operator and a subject behind a wall, and shows preliminary simulations using a blind source separation (BSS) algorithm to confirm the possibility of distinguishing these two heart-motion signals of widely different strength.