Abstract
High Resolution (HR) Synthetic Aperture Radar (SAR) sensors are now available and new information are then retrievable by SAR images. In case of urban areas, the adoption of sound scattering models is crucial for developing reliable feature extractions algorithms in the inverse problem. In this paper, new proper models for the backscattering of urban structures, including features whose dimensions are comparable to the resolution of HR SAR, are introduced and then discussed with emphasis on their use in algorithms for building height retrieval from double reflection contribution to the radar cross section.