8 June 04NexSAT Steering Group Fourth Meeting 1 SATELLITE DATA LINK SYSTEM (SDLS) TOWARDS A DEDICATED MOBILE SATELLITE COMMUNICATION SYSTEM FOR A/G SAFETY COMMUNICATIONS Claude Loisy European Space Agency (ESA) European Space Agency (ESA)

NexSAT Steering Group Fourth Meeting 8 June 04 2 Brief recall of ESA funded SDLS activities (1) Initial feasibility work: Initial feasibility work: based on MSBN started internally in 1994 based on MSBN started internally in 1994 Feasibility Study: Feasibility Study: contract to Alcatel Espace in 95/96 contract to Alcatel Espace in 95/96 System Study: System Study: two contracts placed in 1998: two contracts placed in 1998:Alenia Alcatel Space Industries (ASPI) Service Demonstrator Implementation: Service Demonstrator Implementation: contract with industrial consortium lead by ASPI placed in 2000 contract with industrial consortium lead by ASPI placed in 2000

NexSAT Steering Group Fourth Meeting 8 June 04 3 Brief recall of ESA funded SDLS activities (2) SDLS detailed system definition: SDLS detailed system definition: - contract with ASPI started January 2003 (2,8 M ) - to accompany Eurocontrol service requirement development Industry support to Demonstrations/Evaluations in cooperation with EUROCONTROL Industry support to Demonstrations/Evaluations in cooperation with EUROCONTROL ESA Support Activities: ESA Support Activities: - support to Eurocontrol in the framework of ICAO AMCP - support to Eurocontrol in the spectrum allocation activities within CEPT and ITU

NexSAT Steering Group Fourth Meeting 8 June 04 4 Views of ESA contributing Member States w.r.t. funding of future SDLS activities Extensive feasibility studies and demonstration activities performed by European industry under ESA sponsorship have shown that: Extensive feasibility studies and demonstration activities performed by European industry under ESA sponsorship have shown that: -meeting the requirements of ATS communications including in high density airspace can be achieved both technically and economically with a dedicated design based on existing know-how With respect to its mandate of demonstrating to users the potential benefits of utilisation of space ESA considers that the goal has been achieved With respect to its mandate of demonstrating to users the potential benefits of utilisation of space ESA considers that the goal has been achieved Further support to industry in this context may be envisaged: Further support to industry in this context may be envisaged: - typically aiming at a pre-operational service deployment -it should however be based on a partnership with other stakeholders