ANTARES System Design Iris Public Event, 4-5 February 2013 University of Salzburg Unipark, Salzsburg
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1 ANTARES System Design Iris Public Event, 4-5 February 2013 University of Salzburg Unipark, Salzsburg DOC-TAS-EN-002
2 Contents 2 SRD requirements and system design Performance requirements and main segment features SRD validation
3 SRD Requirements and System Design Aviation requirements driving the system design Service areas ATS, AOC and voice service performance System capacity User terminal constraints Availability requirements 3 Architecture options reduced but still necessary to cope with requirement uncertainties The ANTARES system proposes its baseline (most general case) But all the options will be assessed
4 ANTARES System 4 Space Segment Sat 2 Sat S2 Co-located or Spaced User Terminal Segment CSMa SCC/SOC Ground Segment Voice Gateway Pilot HMI (CMU) Application ATN/ IPS IP S-DLL S-PHY ATN/ OSI CLNP Master NMC Communication Standard Management Control Satellite Transmission Medium GES NCC GES NCC NMC NMC S-DLL S-PHY T-DLL T-PHY A/G Router ATN/ IPS IP T-DLL ATN/ OSI CLNP G/G Router ATN/ IPS IP T-DLL EATM ATN/ OSI CLNP Controller HMI ATN/ IPS IP FDP Application T-DLL T-PHY T-PHY T-PHY Terrestrial Transmission Medium ATN/ OSI CLNP
5 SRD Service Areas: Shall Area shall ORP ADS-C shall ORP ATS+AOC+Voice+ADS-C shall TMA+ENR ATS+AOC+Voice 5
6 ANTARES Coverage over ECAC System dimensioned with respect to the following scenario Air traffic growth scenario: Eurocontrol Log Term Forecast (LTF) 2010 High A Year 2030 Airspace domains: TMA (including APT non-surface), ENR and ORP ATS and AOC service as defined in the COCR v2 30% of aircraft supporting AOC Voice applications ADS-C in ORP In addition to ATS, AOC and voice services 6 Corresponding to the maximum case for the operational infrastructure in the SRD Five ANTARES service areas defined to cover the ECAC Multi-beams (five beams), L-band, satellite antenna
7 FABs vs Beams Mapping Beam 1: SW-Portugal Spain (very limited traffic) Beam 2: SW-Portugal Spain (very limited traffic) Beam 3: UK-IR, SW-Portugal Spain, FABEC, NUAC, NEFAB (highest traffic) Beam 4: BLUE-MED, FAB-CE, DANUBE, BALTIC Beam 5: Part of BLUE-MED 7 Beam 3 Beam 2 Beam 4 Beam 5 Beam 1
8 ANTARES Coverage over Atlantic Ocean 8 System dimensioned with respect to the following scenario Air traffic growth scenario: EC LTF2010 High A Year 2030 Airspace domains: ORP ADS-C in ORP One ANTARES service area Simple L-band satellite antenna should TMA+ENR AOC Shall ORP ADS-C should ORP ADS-C+AOC Option investigated AOC services over the should Visible Earth Area Assess the impact on system design
9 Expected Traffic Growth Profile ECAC "Shall" Area, 99%-tile 9 3,00 Traffic Capacity (Mbps@appl.) 2,50 2,00 1,50 1,00 Forward Link, High Growth (Profile A) Forward Link, Low Growth (Profile D) Return, High Growth (Profile A) Return, Low Growth (Profile D) 0,50 0, Year Data traffic on the forward link (to the aircraft) over the ECAC assessed via simulation Used for system dimensioning System architecture option on system capacity Two possible sizing for the system ANTARES baseline for the system design Worst case for system capacity has been selected High growth
10 Geostationary Orbital Arc for ANTARES Minimum user terminal-to-satellite elevation angle required in the SRD is 5 Possible GEO orbital arc for ANTARES= [15.6 W E] Elevation angles calculated for each satellite position over all the points of ECAC shall area Max elevation angle: 67 for satellite at 15.6 W Min elevation angle: 5 for satellite at 15.6 W and E UT designed so as to maintain the link for aircraft banking angle up to Degree ,7-13,7-11,7-9,7-7,7 Elevation Angles over "Shall" ECAC -5,7-3,7-1,7 0,3 2,3 4,3 6,3 8,3 10,3 12,3 14,3 16,3 Satellite Longitude (deg E) 18,3 Min Elevation Angle Max Elevation Angle ,3 22,3 24,3 26,3 28,3 30,3 32, UT Elevation Angles Aircraft in no-banking conditions Aircraft in banking conditions
11 COCR Performance Requirements 11 The ANTARES system is designed so as to meet the COCR performance requirements Latency (TD95, ET) Continuity Integrity Availability (of use and of provision) COCR: Communication Operating Concept and Requirements for the Future Radio System Issued by EUROCONTROL and Federal Aviation Administration (FAA) The following table is Extracted from the ESA Iris System Requirements Document (SRD) Derived from the COCRv2 document
12 Frequency Bands 12 User link L band (AMSRS) Uplink: MHz Downlink: MHz Feeder link ITU frequencies for FSS Ku band Uplink: MHZ Downlink: MHz Selected on the basis of the analysis performed Traded off wrt C, Ka, X bands Potentially being traded-off also with possible additional requirements issued in the future by Operators ATC/AOC Centre Aeronautical User Terminal Ground Segment EATM
13 Bandwidth Constraints and Allocation The overall L band available spectrum for user link is 10 MHz for uplink + 10 MHz for downlink L band spectrum allocated With maximum chunks of 200 khz both uplink and downlink In whatever portion of the available spectrum MF-TDMA on forward link Time division access A-CDMA + Interference Cancellation on return link Simultaneous users access with code division (spread spectrum) Carrier bandwidth 192 khz (symbol rate of 160 ksps) both on forward and on return link on ECAC 19.2 khz (symbol rate of 16 ksps) on forward link on Atlantic ocean area khz 200 khz 200 khz 200 khz 1545 MHz 1555 MHz 192 khz 192 khz 19.2 khz 192 khz Forward Link ECAC Atlantic ocean
14 Resources Allocation to Satellite Service Providers Resource allocation policy based on Resources (physical carriers) segregation among different SSPs Resources (physical carriers) sharing among stations within the same SSP 14 f1 f2 f3 f4 f5 f6 f7 f8 f9 f10 SSP #1 SSP #2
15 L-band Spectrum Occupancy 15 Number of carriers on forward and return link defined so as to respect the application latency requirements 95% percentile of Transit Delay (TD95) Expiration Time (ET) No contribution to the continuity (and integrity) violation Calculated by means of simulations based on realistic aircraft and data traffic
16 System RAMS Requirements Correlation between airspace domains and COCR classes of services COCR performance requirements per airspace domain Definition of system RAMS requirements per operational scenarios 16 Apportionment of performance requirements to each segment, through classical space/avionics techniques (e.g. Fault Tree Analysis, availability functional block diagrams) Availability of Provision Availability of Use COCR Requirements ENR/TMA ORP ANTARES System Requirements ENR/TMA (Satcom+LDACS) ORP (Only Satcom) ANTARES System Requirements Aggregated Continuity Integrity 5E-8 5E-8 5E-8 5E-8 5E-8
17 Space Segment Deployment Strategy 1,0000 0,9994 0,9988 0,9982 0,9976 0,9970 Validation satellite launched Hot redundant satellite launched On-ground spare available Satellite launched Satellite launched Space segment deployment strategy results Availability: Resources: 5 In-Orbit + 1 On-Ground Spare satellites Launches: Validation infrastructure satellite at T0 Back-up satellite for in-orbit ho redundancy at T0+5 EOL replacements scheduled at T0+15, T0+20, T0+30 Satellite launched MAIN ASSUMPTIONS Validation infrastructure satellite launched at T0 17 Operational system starts at T0+5 years In-orbit hot redundancy Back-up satellite launched at T0+5 years Satellite End of Life (EOL) at 15 years On-ground spare satellite available at T0+5 years In case of in-orbit satellite failure: Fast switch-over to the hot redundant On-ground spare satellite launched within 6 months from failure New on-ground spare satellite built in 3.5 years from failure
18 Ground Segment Architecture Several options for the ground segment architecture Centralised vs distributed access System architecture option Centralised vs distributed control In case on distributed access Applicable to each SSP ANTARES baseline for the system design Operative Satellite Hot Redundant Satellite S-WAN #1 S-WAN #1 18 Distributed access architecture has been selected Most general Hybrid control architecture has been selected Subset of control functions in a central entity Subset of control functions in a the distributed access points SSP Wide Area Network (SSP-WAN) Exchange of information among ground segment elements Based on two satellite WAN (S-WAN)+ one terrestrial WAN (T-WAN) Guaranteeing a very high availability GSE T-WAN GSE GSE SSP
19 SRD Validation 19
20 Conclusions ANTARES system baseline is going to be consolidated 20 Most of the design option trade-offs closed Trade-off under the control of the ANTARES system design team Two types of system architecture options maintained System capacity and ground segment access architecture Final decision is up to the aviation stakeholders ANTARES baseline selected To consolidate the design in view of the system PDR To cover the most general cases of the two for system architecture options Distributed access Maximum capacity supported The current baseline is based on most constraining requirements In terms of level of performance (availability) and air traffic growth Options are analysed To assess the impact on the system design in case of requirements relaxation Entailing possible reduction of the cost of the system
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