System and Mission Trade-offs for Sentinel-1 Next Generation Phase-0 Study M. Zonno, J. Matar, F. Queiroz de Almeida, M. Younis, J. Reimann, M. Rodriguez-Cassola and G. Krieger - German Aerospace Center (DLR) A. Perrera, M. De Giorgi, A. Torrini, C. Cucinella - Thales Alenia Space Italy (TAS-I) M. Tossaint - European Space Agency (ESA) German Aerospace Center (DLR) Microwaves and Radar Institute Oberpfaffenhofen