Reconstruction of the Heterogeneity Distribution Outside of the Scanning Region in Subsurface Radiotomography based on the Synthetic Aperture Radar

The radiowave systems for detection and investigation of hidden underground objects are actively developed. One of the most effective systems for solving of this task is the subsurface radiotomography based on the synthetic aperture radar technology (SAR). Using of non-directed antennas allows detecting back-scattered radiation from all points of investigated medium. Thereby, while scanning of some region of surface by SAR receiver antenna also receives back-scattered radiation from points outside of the scanning region. This fact gives the ability of heterogeneities distribution reconstruction outside of the scanning region. Heterogeneity reconstruction algorithm in the scanning region is based on antenna system focusing.