International Civil Aviation Organization

1
International Civil Aviation Organization

• GALILEO
• CAR/SAM ATN/GNSS Seminar
• Varadero, Cuba, 6 to 9 May 2002

Presentation GNSS 4.3 by E. Chatre
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• GALILEO Overview
• High Level Architecture
• Consist of 30 (273) satellites and associated
  ground infrastructure
• Best solution in terms of robustness and
  performance homogeneity, including northern
  latitudes
• Use CDMA signals on 4 frequencies
• Offer different services (OS-SoL-CS and PRS
  SAR)
• Implement concept of Global Integrity
• Certify system performance
• Fully Operational by 2008

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• Space Segment
• Constellation Configuration

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Signal Baseline

• Open and Safety Of Life Signals

Signal Frequency Chip Rate Data Rate
1 1176 10MHz 50
2 1207 10MHz 250
3 1575 2MHz 200
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• Space Segment
• Constellation Performance
• Horiz accuracy around 4m (95)
• Vertical accuracy around 8m (95)

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• Space Segment
• Satellite Payload

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• Ground Segment
• Overview

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GALILEO Ground Control Stations
for illustration only
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• System Boundaries

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• Local Elements
• Viewed as an integral part of the overall system
• -Recognised that a great many applications will
  require Local Elements i.e. Category III landing
• - Existence of capabilities considered and
  defined within the High Level documents of
  GALILEO
• Local services may be offered by the Galileo
  Operating Company or external service providers
• Possible to offer certified services where
  necessary
• Demonstrators of Local Elements will form part of
  the GALILEO development process and indicate
  achievable performance levels

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• Local Elements
• Performance Enhancement in the following
• Position, Velocity, Time
• Differential Code
• Carrier - TCAR
• Availability
• Pseudolite
• Integrity
• Time To Alarn (TTA), and alam limit
• Communication
• Single or bi-directional
• Voice, Data or Both
• Local Elements will offer different combinations
  of these enhancements to different extents over
  different service volumes
• Base level performances will be specified

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• GALILEO Schedule
• 4 Phases
• Definition Phase
• Up to end 2001
• Initial definition of the GALILEO requirements
  and architecture
• Development and Validation
• 2002 through 2005
• Consolidation of Mission Requirements
• Development of satellites and ground based
  components
• In Orbit validation
• Deployment
• 2006 through 2007
• Construction and launch of satellites
• Installation of complete ground segment
• Operations
• 2008 onwards

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• GALILEO Schedule

2001 2002 2003 2004 2005 2006 2007 2008
2009 2010 .
DEF
Initial Galileo
Full Galileo
DDV
Operational Galileo
Definition Phase
LOR
...
Design Development In-Orbit Validation Phase
Full Deployment Phase
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• Summary
• GALILEO a joint EU / ESA initiative
• Unanimous support from both ESA and EU councils
• EC politically responsible, ESA technically
  responsible
• Builds upon existing European experience in field
  of GNSS (EGNOS)
• Designed from a civilian perspective
• Independent from, but interoperable with other
  systems
• GPS, GLONASS, EGNOS, UMTS etc.
• Brings additional robustness for civil aviation
• Further information can be found at the following
  Web sites
• www.galileo-pgm.org
• www.esa.int/navigation