International Civil Aviation Organization

GALILEO INTERIM SUPPORT STRUCTURE

EUROPEAN COMMISSION

International Civil Aviation Organization

GALILEO

CAR/SAM ATN/GNSS SeminarVaradero, Cuba, 6 to 9 May 2002

Presentation GNSS 4.3 by E. Chatre


EUROPEAN COMMISSION

GALILEO Overview• High Level Architecture

– Consist of 30 (27+3) 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


EUROPEAN COMMISSION

Space Segment• Constellation Configuration

altitude ~23616 kmSMA 29993.707 km

inclination 56 degrees

• period 14 hours 4 min• ground track repeat about 10 days

GGALILEOALILEO DATADATA

27 + 3 satellites in three Medium Earth Orbits (MEO)

Walker 27/3/1Constellation


EUROPEAN COMMISSION

Signal Baseline

• Open and Safety Of Life Signals

E5A

1300MHz

1164MHz

1215MHz

1260MHz

1559MHz

1591MHz

Upper L-BandLower L-Band

E5B E6 L1E2 E1

FREQUENCY (MHZ)

IN PHASE

E5A

1300MHz

1164MHz

1215MHz

1260MHz

1559MHz

1591MHz

Upper L-BandLower L-Band

E5B E6 L1E2 E1

FREQUENCY (MHZ)

IN PHASE

Signal Frequency Chip Rate Data Rate

1 1176 10MHz 50

2 1207 10MHz 250

3 1575 2MHz 200


EUROPEAN COMMISSION

Space Segment• Constellation Performance

• Horiz accuracy around 4m (95%)• Vertical accuracy around 8m (95%)

MEO Constellation for optimal MEO Constellation for optimal European CoverageEuropean Coverage

52Vertical Accuracy in metres


EUROPEAN COMMISSION

Space Segment• Satellite Payload

GALILEOGALILEO In Flight Configuration

Overall Spacecraft:

650 Kg / 1.5 kW class

Launcher Options:

Ariane, Proton, Soyuz,

…...

Navigation payload: 70-80 Kg / 850 W

Search and Rescue (SAR)

transponder: ca. 20 kg


EUROPEAN COMMISSION

Ground Segment• Overview

Delta Integrity Processing Facilities (TBC)

Constellation - 30 satellites

Galileo Control CentreGCC2Galileo Control Centre

GCC1

11 m antenna

Communications Networkfull redundancy

5 Dedicated Mission Up-link Sites

TT&C S-band Up-link(incl. PRS nav)

Mission C-band Up-link (nav/integ/SAR/NRS)

Mission C-band Up-link (nav/integ/SAR/NRS)

IPFsOSPFs PTF

Satellite Control Facility

SCF

Operated Components

Mission Control Facility

MCF

GroundAssets

Control FacilityGACF

GSS

NAV. CHAIN

INT. CHAIN

B-UP CHAIN

5 Combined Galileo Up-link Sites, GUS (global coverage)

from Regional IDSfrom S&Rfrom NRS TBCService

Products Facility

SPF

externalcomms

~ 20 Galileo Sensor Stations(Global Coverage - DOC 4)

excl. redundancy

from Regional IDSfrom S&R

TWTTF

Galileo Mission Monitoring Office

MMO


EUROPEAN COMMISSION

GALILEO Ground Control Stations

for illustration only


EUROPEAN COMMISSION

System Boundaries

USER SEGMENT

IMS

GALILEO CORE SYSTEM

TTC uplink

GCC

L-bandNAV

UHFSAR

….

REGIONALCOMPONENTS

LOCALCOMPONENTS

COSPAS-SARSATGROUND SEGMENT

MEO CONSTELLATION

External ComplementarySystems

C-band uplink

regional uplink

S-b

and

uplin

k

GSS Network

ICC

IMSNetwork

ICC

IMSNetwork IULS

Communication link

LocalInfra-

struct.

Communication link

LocalInfra-

struct.

.

.

.

.

.

.

NAV SIS NAV SIS

NAV SIS NAV SIS

INTEGRITY DETERMINATION& DISSEMINATION

NAVIGATION CONTROL &CONSTELLATION MANAGEMENT

Mission uplink


EUROPEAN COMMISSION

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


EUROPEAN COMMISSION

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


EUROPEAN COMMISSION

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


EUROPEAN COMMISSION

GALILEO Schedule

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 ….

DefinitionPhase Design

Development& In-Orbit Validation

Phase

Full Deployment

Phase

...

DEF

DDV

LOR

Initial Galileo

Full Galileo

Operational Galileo

1.250 B€1.250 B€ 2.150 B €2.150 B € 220 M€ p.a.220 M€ p.a.80 M€80 M€


EUROPEAN COMMISSION

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.orgwww.esa.int/navigation

Documents

International Civil Aviation Organization