Congreso: MILCOM 2010: The 2010 Military Communications Conference. Lugar: San José, California, EEUU Fecha: 31 Octubre - 3Noviembre 2010

Autores: I. de Arriba Ruiz, F. Pérez Martínez y José María Muñoz Ferreras

Synthetic Aperture Radar (SAR) images a target region reflectivity function in the multi-dimensional spatial
domain of range and cross-range. SAR synthesizes a large aperture radar in order to achieve a finer azimuth resolution
than the one provided by any on-board real antenna. Conventional SAR techniques assume a single reflection of
transmitted waveforms from targets. Nevertheless, today’s new scenes force SAR systems to work in urban environments. Consequently, multiple-bounce returns are added to directscatter echoes. We refer to these as ghost images, since they obscure true target image and lead to poor resolution. By analyzing the quadratic phase error (QPE), this paper demonstrates that Earth’s curvature influences the defocusing degree of multipath returns. In addition to the QPE, other parameters such as integrated sidelobe ratio (ISLR), peak sidelobe ratio (PSLR), contrast (C) and entropy (E) provide us with the tools to identify direct-scatter echoes in images containing undesired returns coming from multipath.