3CAT-2: A 6U CubeSat-based multi-constellation, dual-polarization, and dual-frequency GNSS-R and GNSS-RO experimental mission. - Hugo Carreno-Luengo; Adriá Amèzaga; Albert Bolet; David Vidal; Jaume Jane; Juan Francisco Muñoz; Roger Olivé; Adriano Catarino; Miguel Hagenfeldt; Pedro Palomo; Stefania Cornara (IGARSS, 2015)