1. 20 May 03NexSAT Steering Group 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)

2. NexSAT Steering Group Meeting 20 May 03 2 History of ESA funded SDLS activities 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

3. NexSAT Steering Group Meeting 20 May 03 3 Current ESA sponsored SDLS activities 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 framework of ICAO AMCP Support to Eurocontrol in the spectrum allocation activities within CEPT and ITU Support to Eurocontrol in the spectrum allocation activities within CEPT and ITU

4. NexSAT Steering Group Meeting 20 May 03 4 Future ESA sponsored SDLS activities In the planning stage In the planning stage Financial support conditioned by the success of the Eurocontrol initiative Financial support conditioned by the success of the Eurocontrol initiative To target: To target: system simulation system simulation equipment prototyping equipment prototyping performance evaluation and demonstration performance evaluation and demonstration In support to the ICAO standardisation activities In support to the ICAO standardisation activities