TY - GEN
T1 - Multipath reflectivity estimation in urban environments for synthetic aperture radar images
AU - De Arriba-Ruiz, I.
AU - Pérez-Martínez, F.
AU - Muñoz-Ferreras, J. M.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Contrast
KW - Defocus
KW - Earth's curvature
KW - Entropy
KW - Ghost
KW - Integrated sidelobe ratio
KW - Multipath
KW - Peak sidelobe ratio
KW - Quadratic phase error
KW - Synthetic aperture radar
UR - https://www.scopus.com/pages/publications/79951615469
U2 - 10.1109/MILCOM.2010.5680189
DO - 10.1109/MILCOM.2010.5680189
M3 - Conference contribution
AN - SCOPUS:79951615469
SN - 9781424481804
T3 - Proceedings - IEEE Military Communications Conference MILCOM
SP - 864
EP - 869
BT - 2010 IEEE Military Communications Conference, MILCOM 2010
T2 - 2010 IEEE Military Communications Conference, MILCOM 2010
Y2 - 31 October 2010 through 3 November 2010
ER -