GALILEO POSITIONING EVOLUTION - orbi.uliege.be · Galileo signals vs GPS signals • SPP : still...

GALILEO: POSITIONING EVOLUTION

Deprez CécilePhD CandidateUniversity of Liège

2005 - 2008DEVELOPMENT

SYSTEM TESTED

GIOVE A – B

2013IN-ORBIT

VALIDATION PHASE

4 IOV satellitesInitial ground infrastructure

ESA imagesESA images

2016INITIAL GALILEO

SERVICES

OS, SAR, PRS, CS demonstration

GSA image

2014 - 19DEPLOYMENT PHASE

FOC system deployment

2020FULL OPERATIONAL CAPABILITY

24 operational satellites+

6 spares satellites +

Complete ground infrastructure

ESA images

IOV FOCTEST PROTOTYPES

GIOVE-B

EVOLUTION OF # SATELLITES

201120082005 2012 2014 2015 2016 2017 2018

GIOVE-A

2006 2007 2009 2010 2013

4 satellites = positioning possible

AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège -cecile.deprez@uliege.be

Elev min: 0°

December 10, 2014

Observation duration: 24h

Mean # of satellites: 11

Observation duration: 1h56

Mean # of satellites: 4

Galileo

24 hours of data

5 visible satellites

Mean # of satellites: 4.2

Galileo

Elev min: 0°

December 27, 2015

24 hours of data

Elev min: 0°

December 1, 2016GPS

Galileo

024 hours of data

Elev min: 0°

November 16, 2017

Galileo

24 hours of data

Elev min: 0°

October 15, 2018

Galileo

24 hours of data

Observation duration improvement over years

Summary:

1.93.4

22.224

24 visible satellites : 24h observation!

2018 conclusions :

Average # visible satellites/day : 7.4

• Min # visible satellites : 5

• Max # visible satellites : 10[GPS : 16]

[GPS : 7]

Positioning with Galileo-only possible anytime during the day

Observation durationH

[GPS : 11.3]

Evolution of the mean # satellites visible/day over 10 days in 2018:

Days of Year 2018

Mean: 7.27

Galileo = 10 days periodicity

EVOLUTION OF GEOMETRY [PDOP]

2014 2015 2016 2017 2018

PDOP # sat

Increase in # satellites improves geometry

Precision of positioning improved : .POS OBS DOP

Galileo E1 Galileo E5a Galileo E5b Galileo E5a+b

Galileo E6

SignalsAll users

Signal quality :

Galileo

L1 L5 L2

Short baseline (5.6 m)between two Septentrio X4connected to two choke ring Trimble antennas

Signal quality :

Galileo

Phases

L1 L5 L2

Short baseline (5.6 m)between two Septentrio X4connected to two choke ring Trimble antennas

Positioning techniques

Codes Phases

One receiverSingle Point

Positioning (SPP)Precise Point

Positioning (PPP)

Expected 3D precision ~ 5-20 m ~ 0.01 m

Two receivers DGNSS (DGPS)Real Time Kinematic

Expected 3D precision ~ 1-3 m ~ 0.10 m

Values given in reference to ellipsoid WGS84

Short baseline (5.6 m)between two Trimble NetR9connected to two choke ring Trimble antennas

Positioning with Galileo SPP

Galileo E1:

Galileo E1Position 3D: 10.79 m

Satellite Galileo E24 degrades positioning with Galileo!

Galileo E1:

Satellite Galileo E24 removed !

Positioning with GPS SPP

Galileo E1:

GPS L1Position 3D: 4.33 mGPS L1:

Positioning with Galileo + GPS SPP

Galileo E1+

GPS L1 :

Galileo E1 +

GPS L1

Position 3D: 3.32 m

Satellite Galileo E24 removed !

Galileo E1 +

GPS L1

Position 3D: 6.12 m

SPP DGPS

1 m1 m

DGPSPositioning with Galileo

Galileo E1:

Galileo E1Position 2D: 0.72 mPosition 3D: 1.13 m

Galileo E1:

Satellite Galileo E24 removed

Galileo E1:

Galileo E5aPosition 2D: 0.55 mPosition 3D: 0.86 m

Galileo E5a:

Galileo E1:

Galileo E5a+bPosition 2D: 0.16 mPosition 3D: 0.25 m

Galileo E5a+b:

Galileo E1:

GPS L1Position 2D: 0.81 mPosition 3D: 1.32 m

Positioning with GPS

GPS L1:

DGPSPositioning with Galileo + GPS

Galileo E1+

GPS L1 :

Galileo E1 +

GPS L1

Position 2D: 0.43 mPosition 3D: 0.85 m

DGPSPositioning with Galileo + GPS

Galileo E5a+

GPS L5 :

Galileo E5a +

GPS L5

RTKDGPS RTK

1 m 1 m

Positioning with Galileo RTK

Galileo E1:

Positioning with Galileo RTK

Galileo E5:Galileo E5a+bPosition 2D: 0.26 mPosition 3D: 0.33 m

Galileo E5a+b:

Galileo E1:

Positioning with GPS RTK

Galileo E1:

GPS L1Position 2D: 0.17 mPosition 3D: 0.22 m

GPS L1:

Positioning with Galileo + GPS RTK

Galileo E1+

GPS L1 :

Galileo E1 +

GPS L1

Positioning with Galileo possible all day

CONCLUSIONS

Galileo signals vs GPS signals

• SPP : still affected by Galileo low number of satellites (higher PDOP than GPS)

Quality of positioning with Galileo-only

• Similar precisions for codes and phases

• Code signal Galileo E5a+b exceptional

• DGPS : Similar values of accuracy for both GPS & Galileo

• RTK: Similar values of accuracy for both GPS & Galileo

GPS + Galileo combination improves both GPS-only and Galileo-only solutionsAM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège -

cecile.deprez@uliege.be

Cécile DeprezDoctorante en GNSS et géodésieUnité de Géomatique - Université de Liège

Phone : +32 4 366 58 80Email: cecile.deprez@uliege.beLinkedIn

CONTACT

GALILEO POSITIONING EVOLUTION - orbi.uliege.be · Galileo signals vs GPS signals • SPP : still...

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