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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
ESA images
IOV FOCTEST PROTOTYPES
GIOVE-B
30
25
20
5
0
15
10
EVOLUTION OF # SATELLITES
201120082005 2012 2014 2015 2016 2017 2018
GIOVE-A
2006 2007 2009 2010 2013
4 satellites = positioning possible
24 4
6
12
18
22
26
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
FOC
E7 -
E3
E4 -
E5
FOC
E21
–E2
5
E27
–E3
1
Posi
tio
nin
g n
on
ava
ilab
le
FOC
E36
E1
5 –
E33
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
2014
Elev min: 0°
December 10, 2014
0
Observation duration: 24h
Mean # of satellites: 11
GPS
Observation duration: 1h56
Mean # of satellites: 4
Galileo
24 hours of data
16
14
12
10
8
6
4
2
0
# sa
telli
tes
5 visible satellites
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Observation duration: 3h25
Mean # of satellites: 4.2
Galileo
2015
Elev min: 0°
December 27, 2015
0
Observation duration: 24h
Mean # of satellites: 11.3
GPS
24 hours of data
16
14
12
10
8
6
4
2
0
# sa
telli
tes
9 visible satellites
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
2016
Elev min: 0°
Observation duration: 24h
Mean # of satellites: 11.3
December 1, 2016GPS
Observation duration: 18h55
Mean # of satellites: 4.8
Galileo
024 hours of data
16
14
12
10
8
6
4
2
0
# sa
telli
tes
13 visible satellites
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
2017
Elev min: 0°
November 16, 2017
0
Observation duration: 24h
Mean # of satellites: 11.3
GPS
Observation duration: 22h43
Mean # of satellites: 6.2
Galileo
24 hours of data
16
14
12
10
8
6
4
2
0
# sa
telli
tes
17 visible satellites
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
2018
Elev min: 0°
October 15, 2018
Observation duration: 24h
Mean # of satellites: 11.1
GPS
Observation duration: 24h
Mean # of satellites: 7.4
Galileo
24 hours of data
16
14
12
10
8
6
4
2
0
# sa
telli
tes
24 visible satellites
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Observation duration improvement over years
Ho
urs
Summary:
1.93.4
18.9
22.224
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
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
ou
rs
[GPS : 11.3]
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Evolution of the mean # satellites visible/day over 10 days in 2018:
Days of Year 2018
# sa
telli
tes
Mean: 7.27
Galileo = 10 days periodicity
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
30
25
20
5
0
15
10
EVOLUTION OF GEOMETRY [PDOP]
2014 2015 2016 2017 2018
PDOP # sat
Increase in # satellites improves geometry
Precision of positioning improved : .POS OBS DOP
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Galileo E1 Galileo E5a Galileo E5b Galileo E5a+b
Galileo E6
SignalsAll users
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Signal quality :
Cen
tim
etre
s
Codes
GPS
Galileo
L1 L5 L2
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Short baseline (5.6 m)between two Septentrio X4connected to two choke ring Trimble antennas
Signal quality :
Mill
imet
res
GPS
Galileo
Phases
L1 L5 L2
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
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
(RTK)
Expected 3D precision ~ 1-3 m ~ 0.10 m
Values given in reference to ellipsoid WGS84
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
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
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Positioning with Galileo SPP
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 degrades positioning with Galileo!
Positioning with Galileo SPP
Galileo E1:
Galileo E1Position 3D: 4.96 m
Satellite Galileo E24 removed !
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Positioning with GPS SPP
Galileo E1:
Galileo E1Position 3D: 4.96 m
GPS L1Position 3D: 4.33 mGPS L1:
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Positioning with Galileo + GPS SPP
Galileo E1+
GPS L1 :
Galileo E1 +
GPS L1
Position 3D: 3.32 m
Satellite Galileo E24 removed !
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
SPP
Galileo E1 +
GPS L1
Position 3D: 6.12 m
SPP DGPS
1 m1 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
DGPSPositioning with Galileo
1 m
Galileo E1:
Galileo E1Position 2D: 0.72 mPosition 3D: 1.13 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
DGPSPositioning with Galileo
Galileo E1:
Galileo E1Position 2D: 0.71 mPosition 3D: 1.10 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
DGPSPositioning with Galileo
Galileo E1:
Galileo E5aPosition 2D: 0.55 mPosition 3D: 0.86 m
Galileo E5a:
Galileo E1Position 2D: 0.71 mPosition 3D: 1.10 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
DGPSPositioning with Galileo
Galileo E1:
Galileo E5a+bPosition 2D: 0.16 mPosition 3D: 0.25 m
Galileo E5a+b:
Galileo E1Position 2D: 0.72 mPosition 3D: 1.13 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
DGPS
Galileo E1:
GPS L1Position 2D: 0.81 mPosition 3D: 1.32 m
Galileo E1Position 2D: 0.72 mPosition 3D: 1.13 m
Positioning with GPS
GPS L1:
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
DGPSPositioning with Galileo + GPS
Galileo E1+
GPS L1 :
Galileo E1 +
GPS L1
Position 2D: 0.43 mPosition 3D: 0.85 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
DGPSPositioning with Galileo + GPS
Galileo E5a+
GPS L5 :
Galileo E5a +
GPS L5
Position 2D: 0.45 mPosition 3D: 0.73 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
Positioning with Galileo RTK
1 m
Galileo E1Position 2D: 0.29 mPosition 3D: 0.37 m
Galileo E1:
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
Positioning with Galileo RTK
Galileo E5:Galileo E5a+bPosition 2D: 0.26 mPosition 3D: 0.33 m
Galileo E5a+b:
Galileo E1Position 2D: 0.29 mPosition 3D: 0.37 m
Galileo E1:
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
Positioning with GPS RTK
Galileo E1Position 2D: 0.29 mPosition 3D: 0.37 m
Galileo E1:
GPS L1Position 2D: 0.17 mPosition 3D: 0.22 m
GPS L1:
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Positioning with Galileo + GPS RTK
Galileo E1+
GPS L1 :
Galileo E1 +
GPS L1
Position 2D: 0.10 mPosition 3D: 0.15 m
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]
Satellite Galileo E24 removed
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 -
Cécile DeprezDoctorante en GNSS et géodésieUnité de Géomatique - Université de Liège
Phone : +32 4 366 58 80Email: [email protected]
CONTACT
AM/FM GIS Belux & Flagis 25/10/2018 - Cécile Deprez, ULiège [email protected]