Presentation on theme: "Marcus Vilaça Manager, Systems Engineering Advanced Systems Division"— Presentation transcript:
1Marcus Vilaça Manager, Systems Engineering Advanced Systems Division USING THE NEW L BAND MSS ALLOCATIONS - Study Group 8 Seminar on Tomorrow’s Technological Innovations Geneva, 9 September 2004Marcus VilaçaManager, Systems EngineeringAdvanced Systems Division
2Inmarsat BackgroundEstablished in 1979 as an international co-operativePrivatised in April 1999Owns and operates 9 satellites : 4 x Inmarsat 25 x Inmarsat 3Contract for 3 x Inmarsat 4 satellites signed in May 2000Firmly established in maritime, aeronautical and land marketsCustomer base of over 320,000 usersCurrent services include messaging, voice and dataGlobal presence & network of suppliers of services and equipmentGMDSS
3Inmarsat 1st Generation Space Segment Marecs Marisat33 dBW EIRP dBW EIRP2 x 5 MHz bandwidth x 5 MHz bandwidth580 kg dry mass kg dry mass13.5 m solar array m (w) x 3.8 m (h)Launch : A – 20/12/81 (22/08/96) Launch : 1 – 19/02/76B – 09/09/82 (F) – 10/06/76B2 – 10/11/84 (23/01/02) – 14/10/76
4Inmarsat 2 39 dBW EIRP 2 x 20 MHz Processed Bandwidth 700kg Dry Mass 14.5 m Solar Array SpanLaunch: F1 – 30/10/90F2 – 08/03/91F3 – 16/12/91F4 – 15/04/92
5Inmarsat 3 49 dBW EIRP 2 x 60 MHz Processed Bandwidth 1000kg Dry Mass 20.5 m Solar Array SpanLaunch: F1 – 03/04/96F2 – 06/09/96F3 – 18/12/96F4 – 03/06/97F5 – 04/02/98
6Inmarsat 4 67 dBW EIRP 10 dB/K G/T 2 x 126 MHz Processed Bandwidth 9 m deployable reflector3000 kg Dry Mass6000 kg Launch Mass12 kW spacecraft power10 kW payload power48 m Solar Array SpanAstrium’s Eurostar 3000 busMajor SubcontractorsTRW AstroEMSAlcatelBoeingLaunch : F1 – February 2005F2 – July 2005
7Inmarsat 4 Characteristics Frequency BandsMobile L Band and Feeder C bandTranspondersTransparent bent-pipe, C/L, L/C, L/L, C/C & NavigationalDigital Channeliser/Beamformer630 x 200 kHz channels, dynamically allocated to beams256 beamsMobile Link (RHCP, digital beam former)228 narrow spot beams for BGAN service (1.1 degree grid)19 wide spot beams for E&E service (4.05 degree grid)1 global beamFeeder Link (RHCP & LHCP)1 global beam, dual polarisation
10Amethyst Programme Part of the ESA’s Artes 3 Line 4 study programme Feasibility study focused on the changes required to the I4 payload design, to enable utilisation of the L band extensionStudy lead by Astrium, supported by InmarsatScenario 1 : Modification of I4 flight model 3 (“FM3”)1A - Minimum Changes1B - New DSPScenario 2 : Procurement a fourth spacecraft (“FM4”)2A - New DSP2B - Enhanced SSPA’sMain Outputs: Design Solutions, ROM Cost & Development Plan
19Planned Spectrum Activities Studies into the use of the new bands and related sharing studiesParticipation in the work being carried out by WP8D.Regulatory study of the new bandsAssess the use of the new bands by existing terrestrial services, and the possibility of utilization of those bands for the provision of MSS in various countries, concentrating in Region 1 and Region 3.Satellite antenna discriminationAnalyse the impact of PFD limits on the service coverage area by taking into account satellite antenna discrimination performance.
20ConclusionThe MSS L Band extensions offer a great opportunity to significantly increase the capacity of MSS satellites.The modifications required to the baseline Inmarsat 4 satellites to allow service provision in the new bands are significant, but can be kept within limits that allow reduced risk and lower cost and schedule impact.A comprehensive study on the utilisation of the extended L band by existing services will be carried out, to provide an accurate picture of the current situation and of any possible constraints.