Galileo Programme Status and Ongoing GIOVE Experimentation

8/14/2019 Galileo Programme Status and Ongoing GIOVE Experimentation

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EGU 2007 - 16 April 2007, page 1

Galileo ProgrammeStatus and ongoing

GIOVEExperimentation

Daniel Navarro-Reyes

GALILEO Project Office (ESA/ESTEC)

EGU General Assembly 2007Vienna 16 April, 2007


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Table of Contents

Development LogicGIOVE (aka GSTB-v2)

SatellitesMission Segment

DescriptionExperimentation

- Signal in SpaceICD

ReceiverSensor Station

- Clockcharacterisation

MethodologyFM4FM5

Conclusions


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GALILEO Development Logic

GPSConstellation

GalileoExp. SV (*2)

2003 2005 2009 2010-2012

GSTB

V1

GSTB

V2

IOV Phase FOC Phase

Galileo In OrbitValidation

Const. (*4)

Galileo FullOperation

Const. (30)

GIOVE


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What is the GIOVE Mission ?

Galileo In Orbit Validation Element Objectives

Secure Galileo FrequenciesProvide the first GALILEO Signal-in-SpaceTest Payload technology in-orbit, such as the atomicclocks

Validate signal processing and navigation messagegeneration and receptionCharacterize MEO radiation environment

Risk Mitigation approach 2 (3) S/CGIOVE-A by Surrey Satellite Technology LtdGIOVE-B by ESNIS(GIOVE-A2 by Surrey Satellite Technology Ltd)


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GIOVE A

Build by SSTL Mass: 614 kg Size: 1904 x 1394 x 1670 mm

3-axis stabilized: nadir-pointing + yaw steering

Power: 633 W used / 744 Wavail.

3 Payload chains (A,B,C) 2 Rb Clocks (FM4 & FM5) LRR

Launched on 28 December2005 on Soyuz + Fregat fromBaikonur

Control Centre in Guildford

LIMITATIONS Only two frequencies (E1/E5 or

E1/E6) at a time


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GIOVE B

Built by ESNIS Mass: 495 kg Size: 1468 x 1605 x 2735 mm 3-axis stabilized: nadir-

pointing + yaw steering Power: 767 W used / 1161 W

avail. 2 Rb Clocks + 1 H Maser

Launch on 4th quarter 2007on Soyuz + Fregat fromBaikonur

Control Centre in Fucino

LIMITATIONS LRR smaller than GPS

high elevation passes at night only


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GIOVE A2

Build by SSTL Design very similar to

GIOVE-A

ESA has awarded acontract to SSTL for initialactivities

Ready for launch in thesecond half of 2008

Launch date will be decideddepending upon GIOVE-Aand GIOVE-B in-orbitperformance


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GIOVE Mission Segment Drivers

Acquire and store GIOVE rawobservables

Process raw data to generate results(core products)

Collect Payload and Platform Telemetry Support Navigation Message

generation


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GIOVE Mission Overall Architecture


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GIOVE Mission Drivers


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Signal In Space Experimentation Objectives

Confirm the feasibility of Galileo signal tracking in realenvironment with real Signal In Space for different receiverenvironments and user types

Confirm signal design performance assumptions in terms of:C/N0Tracking noise

Static and Dynamic Multipath Conduct RF Surveys for Interference Analysis on a global

scale using the 13 Galileo Experimental Sensor Stationssites

Out Of Band, In Band, Pulsed Interference

Provide early feedback to the Test User Receiverdevelopments


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GIOVE: Provide Experimental Signal in Space

GIOVE-A SIS is fully representative ofGALILEO SIS:

RF and Modulations Chip Rates and Code Lengths Data Rate

GIOVE-A codes are different fromGALILEO codes

GIOVE-A Navigation Message not

representative of Galileo from structure and contents viewpoint(demo purpose)

http://www.giove.esa.int/images/userpage/GIOVEA_SISICD.pdf


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Galileo Experimental Test Receiver Overview

All-In-View dual-frequency PolaRx 2GPS Receiver

+simulaneously tracks the

GIOVE-A and GIOVE-B Channels for CA-code(L1)9 GPS CA channels

Dedicated AltBOCChannel1 AltBOC channel

Channels for tracking allthe modulation, exceptAltBOC

6 GIOVE-A channels

Real-Time Monitoring of the Correlation Fct

Output Measurements Logging Capability

IF Samples Logging Capability

Carrier Aiding

PreDetect, PLL & DLL BW user selectCorrelator Spacing d=35ns

Bump Jumping & Pulse Blanking

Parallel Acquisition (Matched Filt + FFT)

First output of Galileo Test User Receiver development by Septentrio


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Galileo Experimental Test Receiver is operational


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Code and CarrierTracking Noise Performance

Based on Data minus Pilot

Code NoiseGood agreement with theoretical curvesGalileo has lower tracking noise than GPS

Carrier Noise

Independent of modulation scheme


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Code Multipath (Static Environment)

All Galileo signals perform significantly better than GPS-CA Worst signal: L1BC Best signals: L1A, E6A, and AltBOC


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Code Multipath (Static Environment)

Based on GIOVE infrastructure (GESS)SIRD is the required performance for Galileo


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Code Multipath (Kinematic Enviroment)

Very large reduction of multipath error when moving. No visible difference between modulations, except for AltBOC

which remains slightly better.

RuralStatic

RuralMovement

UrbanStatic

MotorwayMovement

GPS-CA 1.19 0.23

L1BC 0.27 0.15 0.40 0.18

E6BC 0.50 0.22

E5a 0.20 0.16

E5b 0.26 0.15E5AltBOC 0.10 0.11

Standard deviation of code multipath in car tests, meters


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SIS Experimentation Results

The good Galileo signal performance, previously obtained by simulationsand laboratory tests has been also confirmed in the fieldCode and Carrier Phase Tracking noise matches theoretical

expectations, especially AltBOC code tracking noise is extremely low(


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Clock Characterisation: Methodology

Orbits + Apparent Clocks

OrbitsClocks wrt H maser.

PL Tx chain

GESS GESS GESSGESS .

SLR ODTS

RINEX 3.00 files

Ref.H-Maser

Satelliteapparent andstation clocks areestimated versus

ground referenceclock (free-running H maser)through ODTS.The main outputis clock phaseoffset wrt referenceclock

Propagation


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Clock Characterisation: Methodology

GIOVE clock is permanentlysynchronized to the master clockthanks to GPS common view

Dual GPS/Galileo station network(GIOVE + all GPS processed togetheron ground)

The GESS is driven by a single clock buthas an inter-system bias

P1-P2

staC

sta

E D 1

)3( sta E D

sta

E D 2

sta

G D 1

)3( staG D

sta

G D 2

station inter-system bias

clock interface

C1C-C7Q

GPSGIOVE

Iono-free combinationsL1/L2 GPSL1/E5 GIOVE


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Clock Characterisation: Data Processing Scenario

Processed data period:2006/10/28 - 2007/03/21

GIOVE transmitting L1+E5

Payload chain A (RAFS FM4 )Payload chain B (RAFS FM5 )

Satellite clocks estimated when inview of at least 2 stations ( DOC-2 )

12 stations , but not all working100%, many DOC-2 holes: sparsedata (as compared to IGS, GSTB-V1)

GPS P1-P2 codes used

GIEN is the reference station(GETR driven by free-running H-maser)

GIOVE RINEX 3.00 observables

Coverage of the 12-station network


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Clock Characterisation:Support from International Laser Ranging Service

High-accuracy laser ranging helpsto improve orbit accuracy

GIOVE tracked by around 10 SLRstations on a regular basis plusdedicated campaigns

Limitations:Shared among many satellitemissions

Depends on weather conditions Tracking campaigns

Early GIOVE mission validationEclipsesIndependent calibration of S/Cproperties


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FM4 Analysis Period

013 - 01713 Jan - 17 Jan 2007ARC 14

009 - 01309 Jan - 13 Jan 2007ARC 13

005 - 00905 Jan - 09 Jan 2007ARC 12001 - 00501 Jan - 05 Jan 2007ARC 11

361 - 36527 Dec - 31 Dec 2006ARC 10

357 36123 Dec - 27 Dec 2006ARC 9

353 35719 Dec - 23 Dec 2006ARC 8

349 35315 Dec - 19 Dec 2006ARC 7345 - 34911 Dec - 15 Dec 2006ARC 6

341 - 3457 Dec - 11 Dec 2006ARC 5

GIOVE A switch-off

319 32215 Nov - 18 Nov 2006ARC 4

GIOVE A switch-off

313 31710 Nov - 14 Nov 2006ARC 3

309 3135 Nov - 10 Nov 2006ARC 2

305 - 3091 Nov - 5 Nov 2006ARC 1

301 30528 Oct - 1 Nov 2006ARC 0

DOYDateArc

1 st period

2 nd period

INRiM Hmasersubstitution

3 rd period013 - 01713 Jan - 17 Jan 2007ARC 14

009 - 01309 Jan - 13 Jan 2007ARC 13


361 - 36527 Dec - 31 Dec 2006ARC 10

357 36123 Dec - 27 Dec 2006ARC 9

353 35719 Dec - 23 Dec 2006ARC 8


341 - 3457 Dec - 11 Dec 2006ARC 5

GIOVE A switch-off

319 32215 Nov - 18 Nov 2006ARC 4

GIOVE A switch-off

313 31710 Nov - 14 Nov 2006ARC 3

309 3135 Nov - 10 Nov 2006ARC 2

305 - 3091 Nov - 5 Nov 2006ARC 1

301 30528 Oct - 1 Nov 2006ARC 0

DOYDateArc

013 - 01713 Jan - 17 Jan 2007ARC 14

009 - 01309 Jan - 13 Jan 2007ARC 13


361 - 36527 Dec - 31 Dec 2006ARC 10

357 36123 Dec - 27 Dec 2006ARC 9

353 35719 Dec - 23 Dec 2006ARC 8


341 - 3457 Dec - 11 Dec 2006ARC 5

GIOVE A switch-off

319 32215 Nov - 18 Nov 2006ARC 4

GIOVE A switch-off

313 31710 Nov - 14 Nov 2006ARC 3

309 3135 Nov - 10 Nov 2006ARC 2

305 - 3091 Nov - 5 Nov 2006ARC 1

301 30528 Oct - 1 Nov 2006ARC 0

DOYDateArc

1 st period

2 nd period

INRiM Hmasersubstitution

3 rd period


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FM4 APPARENT CLOCK on a regular data period

GIOVE APPARENT CLOCK on a regular data period

The Allan deviation onquiet periods isaccording tospecifications


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Frequency jumps

ZOOM


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FM5 Analysis Period

083-08624 - 27 March 2007ARC 20

078 08019 - 21 March 2007ARC 19

074 07815 - 19 March 2007ARC 18

070 07411 - 15 March 2007ARC 17066 07007 - 11 March 2007ARC 16

062 06603 - 07 March 2007ARC 15

DOYDateArc

Total period

083-08624 - 27 March 2007ARC 20

078 08019 - 21 March 2007ARC 19

074 07815 - 19 March 2007ARC 18

070 07411 - 15 March 2007ARC 17066 07007 - 11 March 2007ARC 16

062 06603 - 07 March 2007ARC 15

DOYDateArc

Total period


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FM5 APPARENT CLOCK

The Allan deviation isaccording to specifications

In addition, no frequencyjumps have been observed.


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Clock Characterisation: Conclusions

FM4:Long term behaviour of the apparent clock is showingfrequency offset and linear frequency drift as expected(quiet period)Abrupt jumps in the frequency values

No clear correlation between FM4 apparent clock frequency andtemperature was found

Internal Clock TM resolution not able to highlight correlationClock was switched on/off many times ground experience seemsto correlate this with jumps

Short term stability in spec in the most quiet period

FM5:No frequency jumps are detected on the analysed periodShort term stability in spec in the most quiet period


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Further information

Further information available on following websites:

http://www.giove.esa.inthttp://www.esa.int/export/esaSA/navigation.html

http://europa.eu.int/comm/dgs/energy_transport/galileo


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Acknowledgment


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Thanks.

Documents

Galileo Programme Status and Ongoing GIOVE Experimentation