1. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS Current Activities Presentation to NexSat Steering Group Alcatel Space Sylvain LODDO - Matthieu DABIN 20/05/03

2. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS SLICE 3 - WBS Experimentation Service Analysis Detailed Studies Economic Analysis System Consolidation

3. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS SLICE 3 : STUDY PHILOSOPHY Future SATCOM Solution SDLS feasibility analysis and technical solutions User needs Analysis, Service Requirements Making top-down and bottom-up approaches converge AccessProtocolsWaveform Solutions & Trade-Offs

4. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS SLICE 3 OUTPUTS WP1 : Experimentation report WP2 : Services Definition Document (Services and QoS) WP3 : Core Engineering Activities Detailed Studies Outputs Access and Waveform : CDMA waveform baseline (synchronous vs. asynchronous trade-off) - options on channel coding (based on Turbocodes) and modulations ( /4 QPSK / TCM 8-PSK modulations) providing optimal spectral efficiency Protocols : specific protocol designs to meet several QoS grades Interoperability analysis to allow easy integration on existing and future avionics and ground aeronautical networks System Level Outputs System concept justification file System functional specification WP5 : Economical Analysis (service cost evaluation)

5. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS SLICE 3 STUDY OVERVIEW Indra (SP) Schlumberger Sema (SP) Airtel (Ir) Skysoft (P) Vitrociset (I) Thales ATM (F) Alcatel Bell (B) AlcatelSpace

6. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS AND NEXSAT INITIATIVE Results : SDLS project provided the core technical material for NexSat Circular SDLS project supported Eurocontrol initiative at ICAO level (AMCP/8) Current work : SDLS project supports NexSat Mission Requirement Definition SDLS project develops promotion material available for NextSat (brochure, video) SDLS project provides initial economical analysis of the system operation

7. Presentation to Nexsat steering group - 20 / 05 / 03 Tous droits réservés © Alcatel Space All rights reserved SDLS FUTURE Next phase : build-up of an ESA programme to develop the core element of the future aeronautical satellite system