Refocusing through single layer building wall using synthetic aperture radar

Through-wall imaging using synthetic aperture array technique is studied by employing ultra-wideband antennas and for wide incidence angles. The effect of the building walls on the target image distortions is investigated by simulations and measurements. It is shown that using the idea of match filtering, the effect of the wall can be compensated for and point target response can be reconstructed. A controlled experiment within the laboratory environment is performed to verify the methods, presented. It is shown that for an ultra-wideband system operating over frequency band of 1–3 GHz highly distorted images of two point targets in close proximity of each other behind a wall can be resolved after refocusing. A dual-frequency synthetic method is also presented that can improve the crossrange resolution of the refocused image.