Microwave tomography and unconventional GPR measurement configurations: Review of the performance analysis and examples

In the last years, an increasing interest is addressed toward subsurface imaging carried out by means of innovative GPR systems, such as radar onboard flying platforms and forward looking devices. Here, innovation is mainly related to the adopted measurement configuration and entails an advancement in terms of imaging approaches. These should be, indeed, able to account for the variations, which arise in the scattering phenomenon underling GPR surveys. In this frame, the authors have previously proposed properly designed microwave tomographic approaches. Moreover, the achievable reconstruction capabilities have been investigated theoretically and assessed against numerical and experimental datasets. This paper aims at summarizing these previous research activities, by pointing out how imaging capabilities depend on the adopted measurement configuration.