Post on 27-Mar-2015
EUROCONTROL Experimental Centre
EUROCONTROL Navigation Domain
The Data Collection Network: EGNOS revealed
GNSS 2004 – Rotterdam, The NetherlandsSantiago Soley, PILDO Labs S.L.
EUROCONTROL Experimental Centre
Summary
EUROCONTROL: GNSS-1 Operational Validation The Data Collection Network A Methodology to assess EGNOS performance
• First Glance• Anomaly Investigation• Towards the Final Results
Conclusions and Future Work
EUROCONTROL Experimental Centre
The European Organisation for the Safety of Air Navigation
31 Member States
EUROCONTROLThe European Organisation for the Safety of Air Navigation
32 Member States
EUROCONTROL Experimental Centre
GNSS-1 Operational Validation
EUROCONTROL will coordinate the GNSS-1 Operational
Validation: • To support the Member States in achieving the approval for the
provision of EGNOS services throughout ECAC (European Civil
Aviation Conference) Two distinct areas of work:
• Technical Validation of the performance- SARPS requirements – RNP values- MOPS DO229C compliant receiver
• Definition of operational rules and procedures for aircraft to use
the system for a particular application (APV implementation)
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The Data Collection Network: Objectives
Collect ESTB/EGNOS Data and Evaluate them from different sites in Europe
Group of experts to support:• the development of the tools need in the future EGNOS
Operational Validation - PEGASUS• definition of data collection and processing procedures
Baseline for the future static campaign in the GOV Plan – extended with the Air Navigation Service Providers participation
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The Network
Hartebeesthoek
Kourou
IOR PRN131
Höfn
Tromsö
Hönefoss
Rotterdam
Scilly
Toulouse
MalagaPalma
Canaries
Fucino
Matera
Ankara
ESTB referencestation (RIMS)
EURIDIS referencestation
ESTB processingfacilities (CPF, MCC)
NLES
BarcelonaLisboa
The Data Collection Network
GOV ANSP
EUROCONTROL Experimental Centre
ProcessedProcesseddatadatasa
mples
parameters
Extrapolation
Simulation
ConfidenceConfidence•Integrity (range)•RNP availability•Continuity
Anom
aly in
vesti
gatio
n
Syste
m a
nalys
is
SystemSystembehaviourbehaviour
•file watch•MT•ionosphere•ranges•clock•multipath•etc.
ContinuityAccuracy AvailabilityIntegrity
Data sample filtering(plausibility rules/flag)
Actual Actual performanceperformance
SARPS Thresholds
•event counting•visualisation•position domain
The Methodology
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A First Glance
Proposed algorithmsA C C U R A C Y
A V A I L A B I L I T Y
C O N T I N U I T Y
I N T E G R I T Y
Check against RNP parameters
single site/day
test fail or pass
EGNOS post-SIS1
EEC, April 23rd, 2004
EUROCONTROL Experimental Centre
0
1
2
3
4
5
6
7
8
9
1005
/12/
0120
/12/
0104
/01/
02
19/0
1/02
03/0
2/02
18/0
2/02
05/0
3/02
20/0
3/02
04/0
4/02
19/0
4/02
04/0
5/02
19/0
5/02
03/0
6/02
18/0
6/02
03/0
7/02
18/0
7/02
02/0
8/02
17/0
8/02
01/0
9/02
16/0
9/02
01/1
0/02
16/1
0/02
31/1
0/02
15/1
1/02
30/1
1/02
15/1
2/02
30/1
2/02
14/0
1/03
29/0
1/03
13/0
2/03
28/0
2/03
15/0
3/03
30/0
3/03
14/0
4/03
29/0
4/03
14/0
5/03
29/0
5/03
13/0
6/03
28/0
6/03
13/0
7/03
Date
met
ers Series1
Series2
Series3
Summary of results – Vertical Position Error 95%
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60
65
70
75
80
85
90
95
100
05/1
2/01
20/1
2/01
04/0
1/02
19/0
1/02
03/0
2/02
18/0
2/02
05/0
3/02
20/0
3/02
04/0
4/02
19/0
4/02
04/0
5/02
19/0
5/02
03/0
6/02
18/0
6/02
03/0
7/02
18/0
7/02
02/0
8/02
17/0
8/02
01/0
9/02
16/0
9/02
01/1
0/02
16/1
0/02
31/1
0/02
15/1
1/02
30/1
1/02
15/1
2/02
30/1
2/02
14/0
1/03
29/0
1/03
13/0
2/03
28/0
2/03
15/0
3/03
30/0
3/03
14/0
4/03
29/0
4/03
14/0
5/03
29/0
5/03
13/0
6/03
28/0
6/03
13/0
7/03
Date
%
Series1
Series2
Series3
Summary of results – APV-II Availability (AL 20m)
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Anomaly Investigation
What to do if some anomalies appear that makes some of the test fail?
Just a first check on the obtained performance is not enough to declare the system not compliant with the requirements• detailed analysis on what caused a test fail
Different methods and techniques used by the Network
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Example 1: Jump on the VPE
1.62 1.63 1.64 1.65 1.66 1.67 1.68
x 104
-20
-15
-10
-5
0
5
10
15
20 HPE, VPE, n satellites and VDOP during 10 minutes on Dec 19th
Sample[-]
VPE HPE n satVDOP
Delft, December 26th, 2002
Jump on the position error periodically experiencedJump on the position error periodically experienced
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Example 1: Jump on the VPE
211 12
11 LLCMc
0 20 40 60 80 100 120 140 160 180 200-20
-15
-10
-5
0
5
10
15Signal strength PRN15 and VPE, 200 seconds on dec. 19th
VPE PRN15 signal
Delft, December 26th, 2002
Multipath
Mc combinationMc combination
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Example 2: Integrity Failures
Barcelona, February 6th, 2003
Integrity failures: HPE>HPL
Integrity failures: HPE>HPL
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Example 2: Integrity Failures
Barcelona, February 6th, 2003
MT02/03 anomalies
Psedorange correction oscillations broadcast in MT02 and MT03
UDREI<12IODF<3
Psedorange correction oscillations broadcast in MT02 and MT03
UDREI<12IODF<3
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Example 3: Integrity Failures
Barcelona, September 12th, 2002
MT26 anomalies
60 MI in about 500 epochs60 MI in about 500 epochs
Ionospheric corrections for all visible satellites
PRN17 in red
Ionospheric corrections for all visible satellites
PRN17 in red
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UPC1: Vertical Component
Barcelona, May 22th, 2003
Example 4: Integrity Failures
8 consecutive MI8 consecutive MI
Prefit- residualsPrefit- residuals
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Fast Corrections: UDREIUDREI=14PRN 29
PRN 29
9 s
NO Alarm Conditions
(IODF <3 & UDREI<15)
NO Alarm Conditions
(IODF <3 & UDREI<15)
Sudden jump in C1 codePseudorange for PRN 29.
The ESTB declares the sat. as NOT MONITORED(UDREI=14) 9 sec. after.
Sudden jump in C1 codePseudorange for PRN 29.
The ESTB declares the sat. as NOT MONITORED(UDREI=14) 9 sec. after.
Barcelona, May 22th, 2003
Example 4: Integrity Failures satellite clock jump
Prefit- residualsPrefit- residuals
EUROCONTROL Experimental Centre
20:40
VPE/VPL
Barcelona, November 20th, 2003
Pref-Res PRN11 PRN16
PRN02
Prefit- residualsPrefit- residuals
Large number of MILarge number of MI
Example 5: Integrity Failures
19:17
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PRN16: P2-P1 (shifted)
PRN16: C1-Rho (shifted)
PRN16: L1-L2 (shifted)
STEC
(m
L1
)
19:17 20:40
PRN16: STEC +/- UIRE (ESTB)
Barcelona, November 20th, 2003
Example 5: Integrity Failures
EUROCONTROL Experimental Centre
22:00
18:00
20:00
LOW
Medium
High
Very High
Extreme
October 29-31th November 20-21th
Example 5: Integrity Failures Ionospheric storm
Kp index
from
Oct. 17th
up to
Dec. 1st 2003
Kp index
from
Oct. 17th
up to
Dec. 1st 2003
EUROCONTROL Experimental Centre
To validate SARPS requirements in a reasonable period of time just the data collected from the network would not be enough
• simulations or other methods – get up to the required level of confidence from the measurements
Impossible to do it for all locations under all conditions
• extrapolation of the local results from the network sites• Global Assessment
Towards the final results
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The Global Monitoring System
LINUX
Automatic daily
processingSlog
Automatic data
collectingAutomatic
resultspresentati
on
BRUS
24h GPS and GEO binary data
Receiver
Automatic data
gathering
24h RINEX files
INTERNET
e-mailWEB
server
GPS networks
PEGASUS
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The Global Monitoring System
Cross-check with simulations
Network results extrapolation
Global Assessment HPE 95% & Integrity EventsHPE 95% & Integrity Events
HPL 99% & satellites usedHPL 99% & satellites used
EUROCONTROL Experimental Centre
Conclusions
Summary of the activities from the Data Collection Network – Eurocontrol• gain knowledge on how the data need to be collected,
processed and analysed – EGNOS Operational Validation Methodology (3 axis)
• Actual performance- First glance report• System Behaviour - Anomaly investigation• Confidence, Extrapolation – Global Monitoring System
Dynamic trials
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Future Work
Improving the network layout and the automation of procedures• continuous data logging• automated results data sharing - ftp
Potential data exploitation and validation of the Global Monitoring System results• harmonization with the network sites ones
Data campaigns with the first EGNOS SIS• reuse of all the ESTB lessons learned• expected that the encountered anomalies rarely happen• EGNOS SIS-1 confirms that
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Questions?