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J. Electromagn. Eng. Sci > Volume 10(4); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(4):250-255.
DOI: https://doi.org/10.5515/JKIEES.2010.10.4.250   
Detection of Human Vital Signs and Estimation of Direction of Arrival Using Multiple Doppler Radars
Yong-Jun An1, Byung-Jun Jang2, Jong-Gwan Yook1
1Department of Electrical and Electronic Engineering, Yonsei University
2Department of Electronics Engineering, Kookmin University
This paper presents a non-contact measurement method of vital signal by the use of multiple-input multiple-output (MIMO) bio-radar system, configured with two antennas that are separated by a certain distance. The direction of arrival (DOA) estimation algorithm for coherent sources was applied to detect vital signals coming from different spatial angles. The proposed MIMO bio-radar system was composed of two identical transceivers sharing single VCO with a PLL. In order to verify the performance of the system, the DOA estimation experiment was completed with respect to the human target at angles varying between $-50^{circ}$ and $50^{circ}$ where the bio-radar system was placed at distances (corresponding to 50 cm and 95 cm) in front of a human target. The proposed MIMO bio-radar system can successfully find the direction of a human target.
Key words: Bio Radar, Doppler Radar, DOA, Heartbeat, MIMO, Respiration
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