Synthetic aperture radar image reconstruction algorithms designed for subsurface imaging

The standard image reconstruction algorithm for most SAR systems is either the wavenumber algorithm mainly used for exact wide bandwidth imaging or a version of the chirp scaling algorithm if computational efficiency is important. When it is desired to image a subsurface layer, these reconstruction algorithms can be modified to emphasize a subsurface layer at the expense of the surface layer. The key to the modified algorithm is a reduction of the wavelength used in the reconstruction process by a predetermined amount where the amount of the reduction depends on the depth and the dielectric constant of the soil. Some simulated results shows the effectiveness of the modified algorithm