Abstract:

Based on spectrum transformation procedure, the diffraction tomography (DT) imaging algorithm can achieve volume-scattering object’s imaging results embedded in homogeneous or single layer medium in ground penetrating radar (GPR) applications. But it is not suitable for subsurface targets embedded in multi-layer medium.To solve this problem, a two-dimensional electromagnetic scattering model of targets embedded in planar multilayer environment probing by array antenna is established firstly. Secondly, the spatial spectrum relationship of spatial scattering signals and target’s volume scattering function is founded by introducing the spectrum integral formula of Green function. Based on the above relationship, a planar multilayer diffraction tomography (PML-DT) imaging algorithm is derived subsequently. Through processing simulation data, PML-DT imaging results show that the algorithm can be applied effectively at the aspect of target imaging embedded in planar multilayer environment.