Synthetic Aperture PAU: a new instrument to test potential improvements for future SMOSops - Isaac Ramos-Pérez; Adriano Camps; Xavier Bosch-Lluis; Juan Fernando Marchan-Hernandez; Nereida Rodriguez-Alvarez; Enric Valencia; Fabio Frascella; Paolo Campigotto; Marco Donadio (IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2007, July 23-28, 2007, Barcelona, Spain, Proceedings, 2007)