Processing of holographic subsurface radar data

A backward propagation algorithm of reconstructing images is considered with experimental data obtained by holographic subsurface radars of RASCAN type. This family of radars uses stepped frequency continuous wave signals and can record in-phase and quadrature components of the reflected signal with a frequency bandwidth of 0.5 to 1 GHz with a center frequency ranging from 2 to 14.5 GHz (depending on radar modification). Among examined data acquiring scenarios were both contact and stand off measurements in media with different attenuation. The reconstructed images were shown to have high plan resolution and easy to interpret as the reconstructed microwave images preserve shape and other features of the optical images. Further modifications are suggested to improve the performance of the system.