ABSTRACT
Introduction Doppler radars are a class of radars that use the Doppler effect to provide information about moving objects at a distance. Some well known applications are in weather monitoring and speed detection (police radar gun). The use of microwave Doppler radar for noncontact detection of body motion has been demonstrated in early 1970’s [15]. Based on the information provided by the motion of the human body, microwaves have enabled non-invasive monitoring of several vital physiological parameters such as respiration rate [14], [6], arterial wall movement [28] and heart rate [3], [21]. With technological advances, it has also become feasible to produce small size and low-cost Doppler radar sensors and with that, fl exibility in their applications. Newer signal processing techniques have allowed us to extract relevant information from a cluttered signal better.
