European Space Information Technology

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European Space Information Technology
Future Needs of Communication and Navigation
Missions
ESA-ESOC 27 September 2000
Hans-Hermann Fromm Navigation Department
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Satellite Communication and Broadcasting

• challenge for satellite communications is cost to
  users
• complexity, and hence need for intelligent
  control (IT) comes with spot beams onboard
  routing
• innovations handicapped by relatively small
  business opportunities

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USE OF SATELLITE CAPACITY BY PRESENT OPERATORS
10-15 TRUNK
15-10 VSATS
50 DTH
50 DTH
25 TV PROF
mobile not included
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The attraction of satcom for data
distribution Example Delivery of a CD-ROM of
600 Mbytes to 10000 users
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HYBRID SYSTEM ARCHITECTURE FOR MULTIMEDIA AT HOME
Use of Ka band return channels is quite
attractive

• suitable for reutilization of frequencies large
  capacity
• size of user terminal antennas compatible with
  DTH Receive Only Earth Stations
• allows to optimise the use of resources power
  and frequency to specific markets

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Ku/Ka HYBRID SYSTEM ARCHITECTURE
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ARTES-3 From WEB to WEST
WEST Early Bird (WEB)
WEST
Full beam to beam connectivity Carrier / frame
basis
Full ATM cell connectivity Optimised User to User
connectivity
TDM (e.g. DVB) downlink compatibility

• Carrier Router
• RETURN LINK
• Coarse Demux switching

• ATM Cell Router
• RETURN LINK
• Fine Demux
• Multicarrier Demod/Decoding
• ATM cell regeneration switching
• FORWARD LINK
• TDM demod decod
• ATM cell regeneration switching
• ATM SWITCH CONTROLLER

• Frame Router
• FORWARD LINK
• Demodulation
• Frame switching
• Downlink TDM
• modulation

TRANSPARENT
REGENERATIVE
Lower power Low mass packaging technology
Technology
Available CMOS/ GaAs technology
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• Evolution of Ku/Ka band systems requires
• demand assignment of capacity
• intelligent onboard interconnectivity
• demodulation, switching, re-modulation of the Ku
  band capacity

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HYBRID REGENERATIVE CONFIGURATION
Ku BAND PAYLOAD
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ARTES-3 EUROSKYWAY SERVICE CONCEPT (1)
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Satellite Navigation Infrastructures EGNOS
Galileo

• EGNOS sets the scene challenge is with the
  ground control segment
• Galileo will depend on reliable global monitoring
  and control network
• future GNSS may depend on complex onboard
  monitoring and processing for autonomous
  operations

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EGNOS Integrity Service
Integrity function gives the user a reliable
estimation of his positioning error !
Aircraft Position Reading
Integrity Protection level
Designing for certification is the challenge
Courtesy Alenia/Alcatel
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EGNOS AOC Architecture
GEO
GLONASS
AOR-E
GPS
IOR
ARTEMIS
RIMS
NLES
(x 7)
EWAN
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EGNOS Wide Area Network
RIMS
RIMS
MCC-1
MCC-2
MCC-3
MCC-4
RIMS
RIMS
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Galileo Space Ground Segment Architecture
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Galileo Ground Control Elements
Legend
Monitoring Control
data flow
TM/TC
Signal In Space
TTC data flow
Navigation data
flows
Orbitogr. Synchro.Stations
TelemetryTracking Control
Pseudo rangemeasurements
TM/TC
Navigation data uplink
PrecisionTimingStation
Orbitogr. Synchro.Proc. Facility
Processed data
Time ref.
Navigation data
SatelliteControlFacility
NavigationControlFacility
Status and co-ordination
GCSNetworkMC
Navigation SystemControl Centre
Service Centres Interface
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The challenges on ground GNSS services and
applications
Air traffic management certified navigation and
communication
Integration of mobile comms and position
determination
Large user bases to be operated under controlled
access