The Flex End-to-End Simulator: From Concept Phase (A/B1) to Ground Segment and Operations (C/D). - Jorge Vicent 001; Rosario Ruiloba; Antonio Ruiz-Verdú; Gwenaël Matot; Neus Sabater; Béatrice Berthelot; Federico Magnani; Sergio Cogliati; José Moreno 001; Raffaella Franco; Matthias Drusch; Christine Fernandez-Martin (IGARSS, 2018)