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GALILEOGIOVE-A Mission

ESA/ESTEC

D. Navarro, M. Tossaint, J. Hahn, M. Falcone

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GIOVE Objectives

Galileo In Orbit Validation

Element Support Galileo Frequencies

Filing Notification. Test Payload technology in-

orbit:Clocks and Monitoring ControlUnitNavigation Signal Generator Unit

Provide the first GALILEOSignal-in-Space.

Characterize MEO radiationenvironment.

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GIOVE-A Satellite

Lift-off mass 649 kg

Power demand 700 WStowed Dimensions:

1.3 m x 1.8 m x 1.65 mSolar arrays: 6.8 m 2

Semi-major axis: 29635 km

Inclination: 56 deg

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GIOVE-A Status

Successful orbit injection by Soyuz-Fregatfrom Baikonur on 28 th December 2005

Payload switch-on 10 th January 2006

From 12th

January the first GalileoNavigation signals have been broadcastfrom Space

First Objective achieved: GALILEOFrequencies Filing Notified to ITU

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GIOVE-A Payload

Navigation Signal GenerationTimekeeping system

2 RAFS

Signal Generator Chain2 x CFI Signal Generator Chain (ESA managed)

SSTL Signal Generator ChainTransmit chain: TWTA, Coupler, DiplexersAntenna (Alenia)

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GIOVE-A SIGNAL

GIOVE-A SIS is fully representative of GALILEO SIS:

RF and ModulationsChip RatesData Rate

GIOVE-A can only transmit two signals at a time(L1+E5 or L1+E6)

GIOVE-A codes are different from GALILEO codes

GIOVE-A Navigation Message not representativefrom structure and contents viewpoint(demonstration only purpose)

.

1 2 7 8

. 7 5 M H z

1 5 7 5

. 4 2 M H z

1 1 9 1

. 7 9 5 M

H zFrequency(MHz)

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GIOVE Mission Segment Tasks

Early demonstration of the navigation service(generation, uplink, and broadcast of navigationmessage)

On Board Clock Characterisation

Sensor Station Characterisation (interference andmulti-path characterisation)

Validation of Galileo Ground Segment Models

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Core Infrastructure

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Architectural Design

Lift-off mass 649 kg

Power demand 700 WStowed Dimensions:1.3 m x 1.8 m x 1.65 m

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Routine Navigation Message generation

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GESS Hardware

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Communication Network

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GPCI Design

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First Mission Campaign

ObjectivesTo carry out a preliminary characterisation of the O/Bclocks

Available Infrastructure2 GESS: at ESTEC (Noordwijk) and INRIM (Torino)GIOVE Processing Centre at ESTEC

Time LineStarting from 15 th May: GESS Signal quality assessmentduring first weekStarting from 22 nd May: Processing of Orbits and Clocksfor 6 to 8 weeks

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Expected Performance in First Campaign

According to analysis based on using aGlonass s/c as a mock-up for GIOVE, theavailable infrastructure (2 stations inEurope) would allow to determine

Orbits with a precision of 200 cmClocks with a precision of 4 ns

This performance can be drasticallyimproved by using SLR* data which wouldprovide

Orbits with a precision of 20 cmClocks with a precision of 0.4 ns

Due to clock data gaps (2 stations inEurope), Allan deviation will present gapsat some intervals. However the RAFSbehaviour can be fully characterized:

Short term results are fullyrepresentativeLong term stability can be assed fromthe data.

10 2 10 3 10 4 10 5 10 610 -14

10 -13

10 -12

Overlapp

ing Allan Deviat

,

!( ")

Averaging Time, " , Seconds

FREQUENCY STABILITY

24h Visibilityover EuropeSpecification

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Contribution from/to GNSS Community

GIOVE Mission has adopted IGS Standards:SINEX, SP3, RINEX clockRINEX 3.00

Galileo has cooperated in the creation of RINEX 3.0 observable fileGIOVE mission will help validate

Galileo RINEX Navigation to be confirmed after SIS ICD publication

TEQC enhancement for RINEX 3.0

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Opportunity for GNSS Community

GIOVE-A SIS ICD publicly available in June 2006

Possible participation of IGS membersDeployment of receivers at IGS sites

Access to Galileo Signal through GIOVE observablesEnhancement GIOVE Mission Segment

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Opportunity for ILRS Community

GIOVE-A Laser Retroreflector CharacterisationMade by IPIE (supplier for GLONASS and GPS)76 cubes (27 cm )Return about 10% better than GPS

Enhancement of SLR stationsChangchun station refurbishing procured by NRSC of China

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Conclusions

GIOVE-A signals are fully representative of GALILEO Signalsand have been brought into use Importance of the GIOVE Mission

Onboard Clock CharacterisationSensor Station CharacterisationFeedback into Galileo System Development

GIOVE represent opportunities for both IGS and ILRS GPC and 2 GESS installed and tested First Tracking Campaign

Preliminary Clock CharacterisationUse of SLR data contributes significantly to campaign success

More info soon available at www.giove.esa.int