A high-resolution weak-signal reconstruction method for electromagnetic wave modeling and reverse time migration of ground-penetrating radar data

Abstract

Staining algorithm (SA) was proposed to extract waves that pass through the target area and image the target area with the extracted wave to obtain a higher image quality. In this study, we proposed an approach to reconstruct weak signals for electromagnetic (EM) wave modeling and established the correspondence between subsurface target structures and the reconstructed wavefield. When using the reconstructed partial wavefield in the reverse time migration (RTM) of ground-penetrating radar (GPR) data, we can mute nontarget information from the conventional RTM image and keep target related structures. Numerical experiments show that our method is able to extract low-energy waves under lossy layers. Furthermore, the constructed electromagnetic wavefield is actually a subset of the real electromagnetic wavefield. We applied this method to target-oriented imaging and obtained high-quality images of target structures in lossy media.