cecile deprez - relative positioning with galileo e5 altboc code measurements
TRANSCRIPT
Cécile Deprez
PhD CandidateUniversity of Liège
Relative positioning with Galileo E5 AltBOC code measurements
The CLGE Students’ Contest 2016
The CLGE Student's Contest 2016 - C.Deprez
Possibility of precise positioning with ANDROID raw code pseudoranges ?
Google opens up
code measurements access
The CLGE Student's Contest 2016 - C.Deprez
Metres
Expected precision on a position :
Codes
Challenge
The CLGE Student's Contest 2016 - C.Deprez
Decimetres
Required precision on a position :
Mass-market applications
Challenge
The CLGE Student's Contest 2016 - C.Deprez
Hypothesis
Galileo E5 signal AltBOC Modulation High tracking
accuracy Strong multipath
resistance
Improvement of the code pseudorange precisions
The CLGE Student's Contest 2016 - C.Deprez
MethodDouble difference :
Difference between two SIMULTANEOUS receiver
observations of the two same satellites
Relative Positioning
The CLGE Student's Contest 2016 - C.Deprez
Configurations
ZERO BASELINE
SHORT BASELINE
MEDIUM BASELINEReceiver
observation noise
Theoretical caseBaseline length: 0 metre
Not used in practiceEstimation of the observation noise of the receiver
The CLGE Student's Contest 2016 - C.Deprez
Configurations
ZERO BASELINE
SHORT BASELINE
MEDIUM BASELINE
Analytical caseBaseline length: 5 metres
Estimation of the precision of the OBSERVATIONS
Multipath+
Noise
The CLGE Student's Contest 2016 - C.Deprez
Configurations
ZERO BASELINE
SHORT BASELINE
MEDIUM BASELINE
Practical caseBaseline length:
23 kilometres (Liège – Waremme)87 kilometres (Liège – Brussels)
Precision of the POSITIONS
Atmospheric errors+
Multipath+
Noise
The CLGE Student's Contest 2016 - C.Deprez
Equipment
Waremme
BrusselsSeptentrio PolaRx4TR
Septentrio PolaRx4
University of Liège
Trimble Septentrio
R9
R9
xS
x5
x4
x4
Observable precisions (metres)
10 Days in June 2016
L1 L2 L5 E1 E5a E5bTrimble 0.38 0.30 0.30 0.24 0.22 0.24Septentrio
0.20 0.12 0.14 0.17 0.14 0.14
E5 AltBOC
0.14
0.06
GPS Galileo
Short baselines in Liège
The CLGE Student's Contest 2016 - C.Deprez
The CLGE Student's Contest 2016 - C.Deprez
Results
Observable precision
CONCLUSIONS
Different precisions for different types of receivers
Galileo E5 AltBOC outperforms other GPS and Galileo signals
Galileo E1 & GPS L1 show the worst precision values
Galileo signals are more precise than GPS signals
GPS L2/ GPS L5, Galileo E5a/Galileo E5b show similar quality
The CLGE Student's Contest 2016 - C.Deprez
Precision of the positions (metres)
Liège5 metres baseline
17th January 2016
RMSE 3D
0.53 metres
Galileo E5 AltBOC
The CLGE Student's Contest 2016 - C.Deprez
Precision of the positions (metres)
Waremme23 kilometres baseline
1st April 2015
RMSE 3D
0.59 metres
Galileo E5 AltBOC
The CLGE Student's Contest 2016 - C.Deprez
Precision of the positions (metres)
Brussels87 kilometres baseline
RMSE 3D
1.68 metres
Galileo E5 AltBOC
1st April 2015
The CLGE Student's Contest 2016 - C.Deprez
Conclusions
POSITION precisions
Galileo signals show a better precision than GPS signals
Galileo E5 AltBOC is superior to other signals
OBSERVATION precisions
The CLGE Student's Contest 2016 - C.Deprez
Conclusions
POSITION precisions
OBSERVATION precisions
Limited number of available Galileo satellites degrades the solution
Days with good satellite visibility allow reaching few decimetres precisionFor baselines from 5 metres to 23 kilometres
When compared to reduced-GPS constellation, Galileo results are very promising
The CLGE Student's Contest 2016 - C.Deprez
Dissertation submitted in 2015 to the University of Liège in partial requirements for the degree of Master of Geomatics and Geometrology
Under the supervision of Pr. René Warnant, University of LiègeContact: [email protected]
The CLGE Students’ Contest 2016Cécile Deprez, University of LiègeContact: [email protected]