A postfilter method for refraction and dispersion effects compensation in GPSAR image
Refraction and dispersion make the subsurface targets defocus in ground penetrating SAR (GPSAR). In this paper, a postfilter is proposed to compensate the refraction and dispersion effects, which is more computationally efficient than the previously proposed prefilter method. The postfilter method is tested by the field data of the rail-GPSAR system to yield satisfactory results