Localization of Living-Bodies Using Single-Frequency Multistatic Doppler Radar System

Takashi MIWA  Shun OGIWARA  Yoshiki YAMAKOSHI  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.7   pp.2468-2476
Publication Date: 2009/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2468
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Sensing
localization,  Doppler radar,  multistatic radar,  MUSIC algorithm,  

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Recently, it has become important to rapidly detect human subjects buried under collapsed houses, rubble and soil due to earthquakes and avalanches to reduce the casualties in a disaster. Such detection systems have already been developed as one kind of microwave displacement sensors that are based on phase difference generated by the motion of the subject's breast. Because almost all the systems consist of single transmitter and receiver pair, it is difficult to rapidly scan a wide area. In this paper, we propose a single-frequency multistatic radar system to detect breathing human subjects which exist in the area surrounded by the transmitting and receiving array. The vibrating targets can be localized by the MUSIC algorithm with the complex amplitude in the Doppler frequency. This algorithm is validated by the simulated signals synthesized with a rigorous solution of a dielectric spherical target model. We show experimental 3D localization results using a developed multistatic Doppler radar system around 250 MHz.