Imaging methods for detection of airfield runway disaster

Ground penetrating radar (GPR) is often used in detecting void and cavities under the airfield runway. Delay and Sum (DAS) imaging method based on time-domain focusing of pulse-echo radar data is commonly applied in imaging technique. Image quality depends on echo amplitude and time delay of backscattered signal that picked up from elementary cell. In this paper, in order to improve the image quality, we decompose the target echoes by calculating the echo amplitude and time delay based on EM inversion theory and then image using DAS focusing method after disposing. The simulation results show that this method improve the image quality greatly.