Viability Of Multipath Exploitation In Urban Canyon: Range Profiles Analysis In Tomosar Imaging

The rapid development in SAR three-dimensional imaging technology and the feasibility of employing lightweight and convenient platforms have increased the attention of low-altitude UAV-borne TomoSAR. However, the building obstructions in urban area and the low altitude cause multipath phenomenon, which is challenging in imaging interpretation and accurate reconstruction. While previous research is mainly about the removal of multipath effects, we focus on exploiting multipath information within the framework of low-altitude TomoSAR. This paper aims to explore effective strategies for determining the viability of multipath exploitation in urban canyons. Firstly, we introduce the low-altitude TomoSAR imaging model under the spherical wavefront model. Through a comprehensive analysis of the range profile of the multipath mechanism, our objective is to provide detection and mechanism determination before relocating or restoring the multipath for TomoSAR. This algorithm was applied in real-data experiments to investigate the multipath mechanisms of different cases, validating practical value.