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

EUROCONTROL Experimental Centre 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

EUROCONTROL Experimental Centre The Network Hartebeesthoek Kourou IOR PRN131 Höfn Tromsö Hönefoss Rotterdam Scilly Toulouse Malaga Palma Canaries Fucino Matera Ankara ESTB reference station (RIMS) EURIDIS reference station ESTB processing facilities (CPF, MCC) NLES Barcelona Lisboa The Data Collection Network GOV ANSP

EUROCONTROL Experimental Centre Processeddata samples parameters Extrapolation Simulation Confidence Integrity (range) RNP availability Continuity Anomaly investigation System analysis Systembehaviour file watch MT ionosphere ranges clock multipath etc. ContinuityAccuracyAvailabilityIntegrity Data sample filtering (plausibility rules/flag) Actual performance SARPS Thresholds event counting visualisation position domain The Methodology

EUROCONTROL Experimental Centre A First Glance Proposed algorithms A 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 23 rd, 2004

EUROCONTROL Experimental Centre Summary of results – Vertical Position Error 95%

EUROCONTROL Experimental Centre Summary of results – APV-II Availability (AL 20m)

EUROCONTROL Experimental Centre 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

EUROCONTROL Experimental Centre Example 1: Jump on the VPE Delft, December 26 th, 2002 Jump on the position error periodically experienced

EUROCONTROL Experimental Centre Example 1: Jump on the VPE Delft, December 26 th, 2002 Multipath Mc combination

EUROCONTROL Experimental Centre Example 2: Integrity Failures Barcelona, February 6 th, 2003 Integrity failures: HPE>HPL

EUROCONTROL Experimental Centre Example 2: Integrity Failures Barcelona, February 6 th, 2003 MT02/03 anomalies Psedorange correction oscillations broadcast in MT02 and MT03 UDREI<12 IODF<3 Psedorange correction oscillations broadcast in MT02 and MT03 UDREI<12 IODF<3

EUROCONTROL Experimental Centre Example 3: Integrity Failures Barcelona, September 12 th, 2002 MT26 anomalies 60 MI in about 500 epochs Ionospheric corrections for all visible satellites PRN17 in red Ionospheric corrections for all visible satellites PRN17 in red

EUROCONTROL Experimental Centre UPC1: Vertical Component Barcelona, May 22 th, 2003 Example 4: Integrity Failures 8 consecutive MI Prefit- residuals

EUROCONTROL Experimental Centre Fast Corrections: UDREI UDREI=14 PRN 29 9 s NO Alarm Conditions (IODF <3 & UDREI<15) NO Alarm Conditions (IODF <3 & UDREI<15) Sudden jump in C1 code Pseudorange for PRN 29. The ESTB declares the sat. as NOT MONITORED (UDREI=14) 9 sec. after. Sudden jump in C1 code Pseudorange for PRN 29. The ESTB declares the sat. as NOT MONITORED (UDREI=14) 9 sec. after. Barcelona, May 22 th, 2003 Example 4: Integrity Failures satellite clock jump Prefit- residuals

EUROCONTROL Experimental Centre 20:40 VPE/VPL Barcelona, November 20 th, 2003 Pref-Res PRN11 PRN16 PRN02 Prefit- residuals Large number of MI Example 5: Integrity Failures 19:17

EUROCONTROL Experimental Centre 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 20 th, 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. 1 st 2003 Kp index from Oct. 17th up to Dec. 1 st 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

EUROCONTROL Experimental Centre The Global Monitoring System LINUX Automatic daily processing Slog Automatic data collecting Automatic results presentation BRUS 24h GPS and GEO binary data Receiver Automatic data gathering 24h RINEX files INTERNET WEB server GPS networks PEGASUS

EUROCONTROL Experimental Centre The Global Monitoring System Cross-check with simulations Network results extrapolation Global Assessment HPE 95% & Integrity Events HPL 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

EUROCONTROL Experimental Centre 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

EUROCONTROL Experimental Centre Questions?