All-Directions Thorugh-the-Wall Imaging Using Omnidirectional Bi-Static FMCW Transceivers: Imaging Technique and Performance Evaluation

Through-the-wall imaging using wideband radars is a powerful tool for mapping buildings' interiors and detecting static and moving objects hidden behind the walls. However, the low mobility and limited field of view of conventional systems limit their imaging capability in real scenarios. All-direction through-the-wall imaging using omnidirectional bi-static transceivers has been recently proposed to address the limitations of currently available imaging systems. This paper introduces an image formation technique for all-directions through-the-wall imaging realized by a bi-static FMCW radar. It is shown that a FMCW radar architecture simplifies synchronization of bi-static transceivers and allows for correction of synchronization errors. Imaging through utilizing a previously fabricated radar system in conjunction with the proposed image formation technique shows that all-directions through-the-wall imaging method can provide high resolution, 360° images of building interiors and hidden objects with specular reflections.