Double-Layered Boundary Extraction Method with Accurate Dielectric Constant Estimation for UWB Internal Imaging Radar

A microwave ultra-wideband (UWB) radar system has an advantage for high range resolution and penetrating ability in dielectric object, and is promising for the applications, such as non-destructive testing for aging road or bridge and non-invasive human body inspection. We have already developed an accurate and high-resolution target boundary extraction method as range points migration (RPM) method, which are the advanced algorithm of spatial domain interferometer being applicable to non-point wise target shape. In this paper, we introduce the novel method for extracting double-layered dielectric object by using RPM based approach, where a dielectric constant of surrounding medium is simultaneously determined. The results obtained from the experiment assuming concrete objects, demonstrate the effectiveness of our proposed method.