Automatic Permittivity Characterization of a Weak Dielectric Attached to Human Body Using Wideband Radar Image Processing

摘要

This paper presents a new method for automatically determining the dielectric permittivity and thickness of a penetrable dielectric affixed to the human body by processing radar image responses. This is an important problem for explosives detection with body security scanners, with the potential for reducing the false alarm rate. Starting with reconstructed multistatic mm-wave images of a conductive surface partially covered with a weak dielectric bar, the algorithm determines the nominal conductive surface, identifies the position of the surface-attached dielectric anomaly, finds the front and back dielectric surface reflection responses, and then determines the permittivity and thickness of the dielectric bar.