26 nov 2002 nexsat steering group meeting 1 satellite data link system (sdls) an aeronautical mobile...

26 Nov 200226 Nov 2002NexSAT Steering Group NexSAT Steering Group meetingmeeting

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SATELLITE DATA LINK SYSTEMSATELLITE DATA LINK SYSTEM(SDLS)(SDLS)

AN AERONAUTICAL MOBILE AN AERONAUTICAL MOBILE SATELLITE COMMUNICATION SYSTEM SATELLITE COMMUNICATION SYSTEM

CONCEPT RESPONDING TO THE CONCEPT RESPONDING TO THE DEMANDING REQUIREMENTS OF DEMANDING REQUIREMENTS OF

SAFETY COMMUNICATIONSSAFETY COMMUNICATIONS

Claude Loisy Claude Loisy

European Space Agency (ESA)European Space Agency (ESA)

26 Nov 200226 Nov 2002NexSAT Steering Group meetiNexSAT Steering Group meetingng

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Why the ESA SDLS Programme ?Why the ESA SDLS Programme ?

Historical Background of SDLSHistorical Background of SDLS For many years, ESA has been promoting the concept of For many years, ESA has been promoting the concept of

new mobile satellite communication services with new mobile satellite communication services with tailoredtailored applications in a applications in a private networkprivate network environment environment

SDLS was conceived with the view to meet the highly SDLS was conceived with the view to meet the highly demanding requirements of demanding requirements of safety and regularity of flight safety and regularity of flight communications.communications.

The The “MSBN”“MSBN” (Mobile Satellite Business Networks) (Mobile Satellite Business Networks) prototype system for Land Mobile Service application prototype system for Land Mobile Service application developed by ESA served as a basis for the developed by ESA served as a basis for the SDLS conceptSDLS concept. .


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ESA MSBN Prototype SystemESA MSBN Prototype System

Prototype land mobile satcom system targeting road Prototype land mobile satcom system targeting road transport transport Demonstrated service was Demonstrated service was voicevoice (point to point) and (point to point) and datadata Mobile Earth Stations were Mobile Earth Stations were 10 W single carrier10 W single carrier with with

azimuth driven antennaazimuth driven antenna MSBN used MSBN used synchronous CDMAsynchronous CDMA access in the forward link access in the forward link

and and quasi synchronous CDMAquasi synchronous CDMA in the return link in the return link MSBN was MSBN was successfullysuccessfully experimented with using Inmarsat experimented with using Inmarsat

IOR satelliteIOR satellite Some MSBN tests were successfully performed (Some MSBN tests were successfully performed (19961996) )

using an using an omni-directional antennaomni-directional antenna on the mobile which on the mobile which helped consolidating the feasibility of the helped consolidating the feasibility of the SDLS conceptSDLS concept


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MSBN TESTS MSBN TESTS

VIDEO PRESENTATIONVIDEO PRESENTATION


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MSBN Field Tests in Fucino (1996)MSBN Field Tests in Fucino (1996)

Test Set-upTest Set-up Inmarsat 3 I.O.R. Satellite Inmarsat 3 I.O.R. Satellite Global BeamGlobal Beam Telespazio GES in Telespazio GES in FucinoFucino ESA ESA MSBNMSBN Prototype Prototype FixedFixed Earth Station Earth Station ESA ESA MSBNMSBN Prototype Prototype MobileMobile Earth Station installed on Earth Station installed on

a Telespazio vana Telespazio van Azimuth pointingAzimuth pointing antenna or antenna or Omni-directionalOmni-directional antenna antenna

Video recording at the Video recording at the FESFES Video recording in the Video recording in the vehiclevehicle


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MSBN Field Tests in Fucino (1996)MSBN Field Tests in Fucino (1996)

Video Sound RecordingVideo Sound Recording Recording in the GES Recording in the GES control roomcontrol room

The MSBN return sound channel from the MES is The MSBN return sound channel from the MES is picked up from a loudspeakerpicked up from a loudspeaker

Recording in the Recording in the vehiclevehicle The MSBN forward sound channel is fed directly to The MSBN forward sound channel is fed directly to

the left channel of the camerathe left channel of the camera The ambient sound in the cabin is also picked up by The ambient sound in the cabin is also picked up by

the camerathe camera


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MSBN TESTS MSBN TESTS

VIDEO PRESENTATIONVIDEO PRESENTATION


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ESA SDLS PROGRAMMEESA SDLS PROGRAMME


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ESA SDLS ProgrammeESA SDLS Programme

History of ESA funded activitiesHistory of ESA funded activities Initial feasibility work:Initial feasibility work:

based on MSBN started internally in 1994based on MSBN started internally in 1994

Feasibility Study:Feasibility Study: contract to Alcatel Espace in 95/96contract to Alcatel Espace in 95/96

System Study:System Study: two contracts placed in 1998:two contracts placed in 1998:

AleniaAleniaAlcatel Space Industries (ASPI)Alcatel Space Industries (ASPI)

Service Demonstrator Implementation:Service Demonstrator Implementation: contract with industrial consortium lead by ASPI contract with industrial consortium lead by ASPI placed in 2000 placed in 2000


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Establishing the System Establishing the System ConceptConcept



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Satellite Data Link SystemSatellite Data Link System


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Overall Concept Elements and DefinitionsOverall Concept Elements and Definitions

Forward LinkForward Link

Return LinkReturn Link

UplinkDownlink

UplinkDownlink

GESGES

AESAES

ATCCATCC


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Defining and Justifying Defining and Justifying

Major Design FeaturesMajor Design Features



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SDLS Main Design CharacteristicsSDLS Main Design Characteristics (1) (1)

ServicesServices Voice service (point to point and Voice service (point to point and “Party Line”“Party Line”)) Data service including Data service including broadcastbroadcast and and polledpolled on-board on-board

parameter retrievalparameter retrieval Network ArchitectureNetwork Architecture

Capability for Capability for decentraliseddecentralised satellite access satellite access Capability for Capability for Satellite DiversitySatellite Diversity

May be dictated by service May be dictated by service availabilityavailability requirements requirements Equipment RedundancyEquipment Redundancy

Hot redundancy for the Ground Earth Station Hot redundancy for the Ground Earth Station Stand-by redundancy for the on-board equipmentStand-by redundancy for the on-board equipment


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SDLS Main Design CharacteristicsSDLS Main Design Characteristics (2) (2)

Multiple Access SchemeMultiple Access Scheme Synchronous CDMASynchronous CDMA in the fixed to mobile direction ( in the fixed to mobile direction (ForwardForward Link) Link) Quasi-synchronous CDMAQuasi-synchronous CDMA in the mobile to fixed direction ( in the mobile to fixed direction (ReturnReturn

Link)Link)

Fixed Earth StationsFixed Earth Stations Ku Ku oror C-Band depending on satellite feeder links C-Band depending on satellite feeder links Only Only Ku-BandKu-Band VSATsVSATs practically allow highly decentralised access practically allow highly decentralised access

Aircraft Earth StationsAircraft Earth Stations Low cost solutions meeting Low cost solutions meeting avionics standardsavionics standards are readily are readily availableavailable Only the CDMA modems require a specific technical developmentOnly the CDMA modems require a specific technical development

Space SegmentSpace Segment Capacity is Capacity is commercially availablecommercially available worldwide at L-Band on MSS GEO worldwide at L-Band on MSS GEO

satellites already deployedsatellites already deployed


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SDLS Main System Design ChoicesSDLS Main System Design Choices

Safety Communication Safety Communication Dedicated SystemDedicated System Allows stable and Allows stable and less challengedless challenged access to radio frequency spectrum access to radio frequency spectrum Avoids sharing the Avoids sharing the risksrisks with still to be proven new with still to be proven new passenger servicespassenger services Highly simplifies the design and Highly simplifies the design and reduces the AES costsreduces the AES costs

OpenOpen Technical Standard Technical Standard GeosynchronousGeosynchronous OrbitOrbit Capability for Highly Capability for Highly DistributedDistributed Satellite AccessSatellite Access

Allows GESs (VSATs) to be Allows GESs (VSATs) to be co-located with ATCCsco-located with ATCCs

Aircraft Earth Station CharacteristicsAircraft Earth Station Characteristics Low cost Low cost omni-directionalomni-directional antenna antenna Low cost Low cost single channelsingle channel and medium transmit power (# 30 W) and medium transmit power (# 30 W)


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System Dimensioning System Dimensioning ExampleExample

Channel CharacteristicsChannel Characteristics Voice and/or Data: 6.8 Kb/s (with a 4.8 Kb/s vocoder)Voice and/or Data: 6.8 Kb/s (with a 4.8 Kb/s vocoder)

Waveform and Channel BandwidthWaveform and Channel Bandwidth Ground to AirGround to Air

Synchronous CDMA QPSK spreading factor 255Synchronous CDMA QPSK spreading factor 255 Bandwidth 867 KHz (3 dB)Bandwidth 867 KHz (3 dB)

Air to GroundAir to Ground Quasi Synchronous CDMA QPSK spreading factor 255Quasi Synchronous CDMA QPSK spreading factor 255 Bandwidth 867 KHz (3 dB)Bandwidth 867 KHz (3 dB)

Network Overall Capacity per Satellite BeamNetwork Overall Capacity per Satellite Beam Up to Up to 250250 channels channels with with satellite diversity and Regional Beam satellite diversity and Regional Beam

(continental airspace) occupy (continental airspace) occupy 2 x 1 MHz2 x 1 MHz Up to Up to 100100 channels channels without without satellite diversity and Global Beam (oceanic satellite diversity and Global Beam (oceanic

airspace) occupy airspace) occupy 1 MHz1 MHz


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Supporting Choices in theSupporting Choices in the SDLS ConceptSDLS Concept

Goal has been to improve on the major identified Goal has been to improve on the major identified limitationslimitations of the existing AMSS: of the existing AMSS:

1.1. AES complexity and AES complexity and costcost2.2. Limitation of Limitation of numbernumber of accessing GESs and need for a of accessing GESs and need for a

NCS NCS (Network Control Station) (Network Control Station) 3.3. Slow service recovery following a Slow service recovery following a GES outageGES outage4.4. Very slow service recovery following a Very slow service recovery following a satellite outagesatellite outage5.5. Large usage of Large usage of capacitycapacity consuming consuming random accessrandom access

transmissionstransmissions6.6. Voice service limited to a Voice service limited to a mobile extension of the PSTNmobile extension of the PSTN

supported telephony servicesupported telephony service


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Identified features (in red)Identified features (in red) with the view of improving on with the view of improving on the AMSS limitationsthe AMSS limitations : :

1.1. AES complexity and costAES complexity and cost AES using a AES using a singlesingle 30 W carrier transmitted through 30 W carrier transmitted through omni-directionalomni-directional

antennaantenna

2.2. Limitation of number of accessing GESs and need for a NCSLimitation of number of accessing GESs and need for a NCS Multiple access scheme for GESs is synchronous CDMA (allows Multiple access scheme for GESs is synchronous CDMA (allows

distributed controldistributed control with a with a large numberlarge number of stations and of stations and maximummaximum spectrum and satellite power spectrum and satellite power efficiencyefficiency))

3.3. Slow service recovery following a GES outageSlow service recovery following a GES outage Introduction of smaller (cheaper) GESs would offer fully transparent Introduction of smaller (cheaper) GESs would offer fully transparent

GES redundancy capabilityGES redundancy capability


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Corresponding Features have been designed into SDLSCorresponding Features have been designed into SDLS : :4.4. Very slow service recovery following a satellite outageVery slow service recovery following a satellite outage

Active satellite diversity would remove the Active satellite diversity would remove the loss of serviceloss of service in case of in case of satellite outagesatellite outage

5.5. Large usage of capacity consuming random access transmissionsLarge usage of capacity consuming random access transmissions Maximum usage of dynamically allocated resources would improve Maximum usage of dynamically allocated resources would improve

service quality and guarantee efficient usage of resourcesservice quality and guarantee efficient usage of resources

6.6. Voice service limited to a mobile extension of the PSTN supported Voice service limited to a mobile extension of the PSTN supported telephony servicetelephony service Party line telephony service in closed user group (CUG) and private Party line telephony service in closed user group (CUG) and private

network environment would emulate the VHF R/T servicenetwork environment would emulate the VHF R/T service


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ESA On-Going ActivitiesESA On-Going Activities

andand

Plans for the FuturePlans for the Future



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SDLS DEMONSTRATORSDLS DEMONSTRATOR


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SDLS DemonstratorSDLS Demonstrator

Goals of the DemonstratorGoals of the Demonstrator Illustrate the capacity of modern techniques in Illustrate the capacity of modern techniques in

mobile communication systems to efficiently mobile communication systems to efficiently support some ATM applications support some ATM applications beyond the beyond the capability capability of the existing AMSSof the existing AMSS Party lineParty line functionality in the voice service functionality in the voice service GuaranteedGuaranteed transmission transmission delaydelay for time critical aircraft for time critical aircraft

data (e.g. ADS)data (e.g. ADS)


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SDLS DemonstratorSDLS Demonstrator

Overall Characteristics of the DemonstratorOverall Characteristics of the Demonstrator Operates to a satellite with Ku-Band feeder linksOperates to a satellite with Ku-Band feeder links

Demonstrates usage of VSAT type GESsDemonstrates usage of VSAT type GESs Emulates low power single channel AESs with omni-Emulates low power single channel AESs with omni-

directional antennasdirectional antennas Demonstrates usage of low cost AESs also for voiceDemonstrates usage of low cost AESs also for voice

Emulates typical data link applicationsEmulates typical data link applications Intended Usage of the DemonstratorIntended Usage of the Demonstrator

Provide live technical demonstration capability of key Provide live technical demonstration capability of key new features now available for incorporation into a next new features now available for incorporation into a next generation satellite system (NGSS)generation satellite system (NGSS)


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ESA SDLS FUTURE ESA SDLS FUTURE PROGRAMMEPROGRAMME


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ESA SDLS Future ProgrammeESA SDLS Future Programme

Work is now closely coordinated with Work is now closely coordinated with EUROCONTROL through a MoU signed in 2002EUROCONTROL through a MoU signed in 2002

ESA future industrial activitiesESA future industrial activities SDLS detailed system definition:SDLS detailed system definition:

- to be started December 2002 (3 to 4 M€)- to be started December 2002 (3 to 4 M€)

- - to accompany Eurocontrol service requirement developmentto accompany Eurocontrol service requirement development

SDLS full system development:SDLS full system development:- # 40 M€ over four years starting in 2004- # 40 M€ over four years starting in 2004

Industry support to Industry support to Demonstrations/EvaluationsDemonstrations/Evaluations in co- in co- operation with EUROCONTROLoperation with EUROCONTROL


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ESA SDLS Future ProgrammeESA SDLS Future Programme

ESA Support ActivitiesESA Support Activities

Spectrum defence activities through Spectrum defence activities through CEPT and ITUCEPT and ITU groupsgroups

Support to Eurocontrol in the framework of Support to Eurocontrol in the framework of ICAO ICAO AMCP AMCP

26 nov 2002 nexsat steering group meeting 1 satellite data link system (sdls) an aeronautical mobile...

Documents

nexsat steering group

return link msbn

sdls concept slide

msbn field tests

inmarsat ior satellite

azimuth driven antenna

vehicle slide

camera slide