GALILEO OVERVIEW AND STATUSAlexandre Steciw

Cracow-23 September 2004

2

The European Approach (1)

EGNOS

- Civil augmentation to military GPS and GLONASS

- Signals distributed through 2 Inmarsat / 1 Artemis Geo Transponders

- Interoperable with WAAS and MSAS (ICAO standard, seamless service)

- Pre-operational EGNOS Signals already available through EGNOS Testbed since early 2000 – used for tests and demonstrations

- Fully Operational Signal in 2004

- Initiative of the European Commission, Eurocontrol and ESA

EGNOS is the first contribution of Europe into GNSS and the first step towards Galileo

3

The European Approach (2)

Galileo

- Global Navigation Satellite System

- Under Civil Control

- Independent but compatible and interoperablewith GPS and GLONASS

- With service guarantees

- Target Date to be operational - 2008

- Initiative of the European Commission and ESA

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Galileo Services

•Galileo Satellite-only Navigation, Positioning & Timing Services (through the Galileo Signal-In-Space):

Open Service (OS) –free and available to the public Commercial Service (CS) – under commercial conditions Safety of Life Service (SoL)- for safety-of life applications & users Public Regulated Service (PRS)- for government authorised users

•Support to the Search and Rescue Service (SAR):

406/1544.1 MHz transparent Forward Link for COSPAS/SARSAT compatible distress beacons localisation in the COSPAS/SARSAT ground segment

SAR Return Link Messages (Acknowledgement & Coordination) through Galileo Signal in Space

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Galileo Services

•Galileo Locally Assisted Services:

Network Assisted/ Location Based Services Indoor Positioning Services High Precision Navigation & Positioning Services

•Galileo SIS plus Local Augmentations:

Improved safety-of life applications, e.g. for trains & railways, port navigation, precision landing approach etc.

Road applications (predicted adaptive cruise control, tolling etc.)

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Galileo Services

•Galileo Combined Services

Galileo + other satellite navigation system (SBAS, GPS, GLONASS,...) Galileo + other non-satellite navigation systems (LORAN C, mobile

systems,…) Galileo + communications systems (GSM, GPRS, UMTS,…)

EGNOS Services augmenting GPS and complementing Galileo services

Wide area differential corrections for GPS over ECAC region Real-time Integrity messages for GPS-based Safety-of Life applications Ionosphere corrections for single-frequency users Complementary GPS-like ranging signals for improved availability

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GALILEO Open Services Performance

Open Service Carriers Single Frequency Dual-

Frequency Type of Receiver Ionospheric

correction Based on simple model

Based on dual-frequency measurements

Coverage Global Accuracy (95%) H: 15 m

V: 35 m H: 4 m V: 8m

Timing Accuracy wrt UTC/TAI 30 nsec Availability 99.8 %

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Safety-Of-Life Service

Carriers Three Frequencies

Computes Integrity

Yes Type of Receiver

Ionospheric correction

Based on dual-frequency measurements

Coverage Global Critical level Non-critical level Accuracy (95%) H: 4 m

V: 8 m H: 220 m

Alarm Limit H: 12 V 20 m H: 556 m Time-To-Alarm 6 seconds 10 seconds

Integrity

Integrity risk 3.5x10-7 / 150 s 10-7/hour Continuity Risk 10-5/15 s 10-4/hour – 10-8/hour

Certification/Liability Yes Availability of integrity 99.5%

Availability of accuracy 99.8 %

GALILEO SOL Performance

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GALILEO + GPS Combined Performance Galileo OS

(10° m.a.) single frequency receiver

Galileo OS + GPS (10° m.a.) single frequency receiver

Galileo OS (10° m.a.) dual frequency receiver

Galileo OS +GPS (10° m.a.) dual frequency receiver

Galileo OS (30° m.a.) single frequency receiver

Galileo OS + GPS (30° m.a.) single frequency receiver

Horizontal accuracy

15 7-11 4 3-4 14-54 11-21

Vertical accuracy

35 13-26 8 6-8 21-81 17-32

Galileo OS and GPS combined service performances (illustrative)

Receiver elevation masking angle

Number of visible GALILEO satellites

Number of visible GPS satellites

Total

5° 13 12 25 10° 11 10 21 15° 9 8 17

Maximum number of visible satellites for various masking angles

Combined use provides increased performance and availability (RAIM) for high masking angle, e.g. urban canyons

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GALILEO Frequency Plan, L-Band

GALILEO Bands (Navigation)

GALILEO SAR Downlink

GPS Bands

E5a/L5 E5b E6 L1E2 E1

1164

MH

z

1214

MH

z

1260

MH

z

1300

MH

z

(*) 1

176.

45 M

Hz

1278

.75

MH

z

1544

MH

z15

45 M

Hz

1559

MH

z

1587

MH

z

1591

MH

z

1563

MH

z

1575

.42

MH

z

1215

MH

z

1237

MH

z

(*) 1

207.

140

MH

z

SARL2

RNSS Bands RNSS Bands

ARNS Bands ARNS Bands

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FrequencyFrequency

GALILEO Signals

1278.75 MH

z

E6

G/Nav Signal:BOC(10,5) mod.Rc=5.115 Mcps

G/Nav Signal:BOC(10,5) mod.Rc=5.115 Mcps

C/Nav Signal:Data + PilotBPSK mod.Rc=5.115 McpsRs=1000 sps

C/Nav Signal:Data + PilotBPSK mod.Rc=5.115 McpsRs=1000 sps

1575.42 MH

z

L1E2 E1

G/Nav Signal:BOC(n,m) mod.G/Nav Signal:BOC(n,m) mod.

I/Nav Signal:Data + PilotBOC(2,2) mod.Rc=2.046 McpsRs=250 sps

I/Nav Signal:Data + PilotBOC(2,2) mod.Rc=2.046 McpsRs=250 sps

1176.45 MH

z

L5/E5a E5b

F/Nav Signal:Data+PilotBPSK mod.Rc=10.23 McpsRs=50 sps

F/Nav Signal:Data+PilotBPSK mod.Rc=10.23 McpsRs=50 sps

I/Nav Signal:Data+PilotBPSK mod.Rc=10.23 McpsRs=250 sps

I/Nav Signal:Data+PilotBPSK mod.Rc=10.23 McpsRs=250 sps

(MHz)PILOT CHANNELS

DATA CHANNELS

1207.140 MH

z

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GALILEO Signal Parameters

Bands E5a E5b E6 E2-L1-E1

Services OS/SOL/CS OS/SOL PRS CS PRS OS/SOL/CS

Channels Data Pilot Data Pilot Data Pilot Data Pilot 

Ranging Code Rate(Mcps)

10.23 10.23 10.23 10.23 10.23 5.115 5.115 m 2.048 2.048

Modulation Type

AltBOC 

BOC(10,5)

BPSK(5)

BPSK(5)

BOC(n,m)

BOC(2,2)

BOC(2,2)

Symbol Rates (Bd)

50 N/A 250 N/A --- 1000 N/A ---- 250 N/A

Minimum Received Power on Ground at 10o elevation in dBW

-158 -158 -158 -158 -155 -158 -158 -155-160to-158

-160to-158

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GALILEO Architecture

Space Segment

User Receiver Demonstrators

Local Component Demonstrator Local Components

External RegionalIntegrity Systems

User Receivers

Search&

Rescue

Service Providers

MEO-LUT

COSPAS-SARSAT

Ground Segment

DistressBeacons

RLSP

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The GALILEO Satellite

Mass at Launch (incl. Propellant)

Power Consumption

Dimensions:

Main Body

Length (with deployed solar arrays)

Lifetime

Ca.680 kg

Ca. 1.6 kW

 

2700 x 1200 x 1100 mm

13 m

12 years

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The GALILEO Ground Segment

•The Galileo Ground Segment comprises the Ground Control Segment (GCS) and the Ground Mission Segment (GMS) and includes:

•A global network of Galileo Sensor Stations (GSS)

•A global real-time oriented network of Up-link Stations (ULS) for mission data up-link in C-Band

•A global network of Telemetry, Telecommand and Ranging Stations (TT&C) for control of the satellites in S-Band

•An interconnecting high performance communication network and

•2 geographically redundant Galileo Control Centres (GCC) for all the centralised processing, monitoring & control.

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The GALILEO Ground Segment Architecture

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Considered TT&C & ULS Station Sites

Svalbardor

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Locations considered for Sensor Stations

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GALILEO Master Schedule

1 Test Satellite & 4 Operational Satellites

Ground Infrastructure

26 Satellites

Ground Infrastructure

Routine Operations and Replenishment

Development and Validation Deployment Operations and Maintenance

48 months 24 months 20 years

The European Commission 6th Framework Programme

Complementing the Development of the Galileo System

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EC 6th Framework Programme, 1st Call

•Development of User Receivers

•Development of Local Elements

Preliminary Design of a Local Component Demonstrator Preliminary Design of SAR G/S Elements, e.g. MEOLUT Preliminary Design of a Galileo Time Service Provider Preliminary Design of a generic Galileo Service Centre Preliminary Design of a generic External Regional Integrity System

•Galileo Thematic Support

certification external interfaces frequency issues

•EGNOS Integration into Galileo

•Development of Galileo Business Plan

The European Space Agency Galileo System Test Bed Programme

Mitigating the Technical Risk for the Development of the Galileo System

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ESA GSTB Activities

•GSTB V.1:

Design and Verification Tool for the mitigation of the Galileo risks related to algorithms Experimentation framework convoying the experience from European industries,

institutes and agencies towards common objectivesA GSTB V1 Processing Centre set-up at ESA/ESTEC, Noordwijk with access to 1-sec

observed GPS dual-frequency data from 25 sensor stations worldwide

•GSTB V.2:

Protection of GALILEO frequency filings In orbit atomic clocks experimentation MEO environment characterisation Signal experimentation Two independent contracts are placed with European Industry (GAIN & SSTL) to

launch two Experimental Satellites by end of 2005Experimentation activities are planned to be performed in the frame of the Galileo IOV

programme

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Conclusions

Galileo after EGNOS will provide a further European Contribution into Global Navigation

Satellite Systems

Galileo will ensure interoperability with existing systems for the benefits of the users

Galileo will be open for partnerships in other regions

With the approval of the IOV Program for Galileo - Galileo is becoming a reality

Thank you for your attention!