EUROCONTROL Experimental Centre EUROCONTROL Navigation Domain The Data Collection Network: EGNOS revealed GNSS 2004 – Rotterdam, The Netherlands Santiago

EUROCONTROL Experimental Centre

EUROCONTROL Navigation Domain

The Data Collection Network: EGNOS revealed

GNSS 2004 – Rotterdam, The NetherlandsSantiago Soley, PILDO Labs S.L.


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


The European Organisation for the Safety of Air Navigation

31 Member States

EUROCONTROLThe European Organisation for the Safety of Air Navigation

32 Member States


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)


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


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


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


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


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%


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)


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


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


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


Example 2: Integrity Failures

Barcelona, February 6th, 2003

Integrity failures: HPE>HPL

Integrity failures: HPE>HPL



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



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


UPC1: Vertical Component

Barcelona, May 22th, 2003


8 consecutive MI8 consecutive MI

Prefit- residualsPrefit- residuals


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



20:40

VPE/VPL

Barcelona, November 20th, 2003

Pref-Res PRN11 PRN16

PRN02


Large number of MILarge number of MI


19:17


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



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


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


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


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


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


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


Questions?

Documents

EUROCONTROL Experimental Centre EUROCONTROL Navigation Domain The Data Collection Network: EGNOS revealed GNSS 2004 – Rotterdam, The Netherlands Santiago