Permittivity imaging method by incorporating range points migration and ellipsometry for UWB short range radar

Ultra-wide band (UWB) pulse radar has a possibility to create an innovative short-range sensing technique, such as for 3-dimensional (3-D) imaging sensor or non-destructive because it has the cm order range resolution and sufficient penetration depth in low lossy dielectric material. In the actual radar scenario, such as human body recognition in rescue scene or crack detection in large scale non-destructive crack monitoring in aged road, road monitoring, it is strongly required for not only an image but also the dielectric property of object. As a promising non-contact extraction for complex permittivity, we focus on the ellipsometry method exploiting the fully polarimetric re ection data. Furthermore, we incorporate the range points migration (RPM) based imaging approach and the ellipsometry, where each reconstructed scattering center can be associated with each complex permittivity extracted from ellipsometry method. This paper also introduces the calibration approach for the re ection ratio coefficient in order to compensate a physical difference from optical based ellipsometry observation model. The three-dimensional (3-D) finite difference time domain (FDTD) based numerical simulations demonstrate that our proposed method effectively unifies the surface image and complex permittivity information with simple algorithm.