Radar imaging of a large building based on near-field Xpatch model

The U.S. Army Research Laboratory´s ultra-wideband (UWB) radar was used in field experiments for through-the-wall imaging of an abandoned Army barrack with an approximate 33 m by 27 m footprint. In a previous paper, we used a Physical Optics (PO) based ray tracing code simulating a far-field spotlight configuration in order to explain some scattering features observed in the experimental image (obtained via near-field strip-map configuration). In this paper, we use the same code and model for a data collection geometry that closely matches the experimental setup, and the backprojection algorithm (BPA) for image formation. The new simulated image shows an improved correlation with the measured image, further confirming the applicability of ray tracing codes for UWB imaging in a realistic environment.