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C. Bruyninx, J. Legrand, F. Roosbeek EPN Central Bureau Royal Observatory of Belgium

Explore the application of GNSS network management procedures to the EPN, covering guidelines, data flow, and calibration details. Learn about the transition to APCV and antenna calibrations. Stay updated on new station guidelines and monitoring processes.

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C. Bruyninx, J. Legrand, F. Roosbeek EPN Central Bureau Royal Observatory of Belgium

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  1. GNSS Network Management Procedures: Application to the EPN C. Bruyninx, J. Legrand, F. Roosbeek EPN Central Bureau Royal Observatory of Belgium http://epncb.oma.be/

  2. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary 203 permanent GNSS stations 30 % GPS+GLONASS 91 % hourly 44 % real-time 40 % IGS 38 countries Real-time Hourly Daily

  3. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary IGS ≠ EPN • Site guidelines – • Difference between IGS and EPN guidelines • Hourly and daily data flow 2004-2005 • Dependence on one regional data centre • Guidelines for real-time data 2006 • EUREF-IP Pilot Project • Antenna Calibrations 2006 • IGS switch to APCV

  4. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary DATA FLOW Dec. 2004: guidelines Spring 2005: implementation

  5. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary antenna • Result: • 2 regional data centers : • OLG (Austria) and BKG (Germany) • 95% 99% • (BRST, BSCN,CAGZ,KELY, PUYV, QAQ1, RABT, THU3, TRAB, VFCH) (REDU, TRAB)

  6. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary Real-time • EUREF-IP Pilot Project : 2002-2007 • Today: real-time data dissemination part of routine EPN operations • EPN Site Guidelines: • 3 new network components • Local Broadcaster, Regional Broadcaster (www.euref-ip.net),High Rate Data Centre (ftp://igs.bkg.bund.de/EUREF/highrate/yyyy/DOY/H/) • EPN real-time streams → Regional Broadcaster → Users • Min. Requirement: 1 Hz data, full code and carrier phases • Format: RCTM 2.X (X=1,2,3), RCTM 3.X (X=0,1), SOC, RAW • Converter to RINEX needs to be freely available

  7. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary antenna • November 2006 IGS switch to APCV • Absolute calibrations • converted field calibrations (elev dependency, probl. below 10°) • True absolute calibrations (elev+azimuthal dependency), eg GEO++ • For IGS stations: IGS CB can distribute type absolute calibration values (GEO++) for antenna/radomes • BUT for EPN stations : EPN CB can NOT publish absolute type calibrations (GEO++) for antenna/radome included in the EPN, but not in IGS

  8. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary Abs. calib. from robot 69% Converted field calib. 16% Uncal. pairs 15% antenna Nov. 2006

  9. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary antenna • EUREF objectives: • Reduce # of antenna/radome combinations without known absolute robot calibrations and work towards long-term improvement of network • Need to find a solution for (future) EPN stations with known abs. type calibr. but not included in IGS network • New EPN guidelines (Dec 2006): • All antenna/radome combinations introduced within EPN station after Dec 5, 2006 must have TRUE absolute calibrations (taking radome into account). • Use IGS ATX complemented with absolute individual antenna/radome calibrations for EPN stations

  10. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary antenna May 2008 Indiv. abs. calib 8% True abs. calib 69 % 77% Calib. from field 11% No calib. 12% Dec. 2006 Indiv. abs. calib., 5% True abs.calib 64% 69% Calib. from field 14% No calib. 17%

  11. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary antenna GEO++ letter to IGS August 2nd, 2007

  12. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary procedure • Procedure for inclusion of new EPN stations: • Commitment letter (5 years) • Location in EPN, co-locations, connection to national and European levelling network • GNSS receiver and antenna/radome type + calibration • Planned data flow • Site log • Operational Centre Form • Digital Station Pictures • If site log is approved : • Start daily+ hourly data flow to primary and secondary data centres + real-time data flow to real-time broadcaster • EPN CB verifications • Once passed the EPN CB verifications, EPN ACs are contacted (3 ACs needed) • EUREF mail to announce new EPN station

  13. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary verifications EPN CB Verifications Daily&hourly metrics 90% availability requested in 2 RDC 90% below 10 min. latency (hourly) Last 7 days Real-time metrics 90% availability at regional broadcaster Latency: Simulate user and download stream using 2-hour samples

  14. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary verifications OSJE (Croatia) RTCM3.0 0.5 s BRUS (Belgium) RTIGS 1.8 s BELL (Spain) RTCM3.0 3.5 s

  15. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary verifications EPN CB Verifications Daily Meta-data verification: RINEX data versus site log Similar to IGS but, including antenna serial number! Real-time (RTCM format) antenna/radome type, antenna height, station coordinates 2 hour samples

  16. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary verifications • EPN CB Verifications

  17. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background> Guidelines > New Stations > Monitoring > Summary verifications • Data quality verification : - Teqc-based • - tracking plots • Tracking at low elevations: • elevation cut off angle • L2 • obstructions

  18. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary Summary Stations are not included in EPN as long as all criteria are not fulfilled

  19. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary web • EPN CB Web site = gateway to all information about EPN sites • Verifications continue after station is included in EPN • Complemented with results of other agencies contributing to EPN • time series (rapid, long-term) • ZTD biases • Automated site logs test/submission through email • for IGS stations copy to IGS CB • Web-based site log submission under development • No automatic emails to station managers • reduce # of false alarms & automatic filter to trash • but time consuming

  20. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary Mails • EUREFmail • Monthly reports on latency of hourly data • Weekly reports on availability and meta-data consistency in daily data • Extended reports under development • eg availability and latency of real-time data

  21. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary Analysis Centres • Interaction with EUREF Analysis Centers • euref.snx, excluded.wwww,… • Weekly verification of SINEX files • Antenna/radome type + serial number • Antenna calibration values – offsets only • Station list (missing EPN stations, non-EPN stations) • Emails to AC (copy to AAC)

  22. Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Status > Guidelines > Tracking > Monitoring > Summary Background > Guidelines > New Stations > Monitoring > Summary • EPN guidelines : data flow, real-time, antenna • New EPN stations: • Quality over quantity, but exceptions are allowed • If you do not get the info at the time the station is proposed, then you will never get it once it is in the EPN • Follow up is crucial • Statistics available on-line for station managers and ACs • Usage? • Limited alarms running, but need for more. Automated emails?

  23. Background > Management > Guidelines > New Stations > Monitoring > Summary EPN CB

  24. Background > Management > Guidelines > New Stations > Monitoring > Summary EPN CB

  25. Background > Management > Guidelines > New Stations > Monitoring > Summary EPN CB

  26. Background > Management > Guidelines > New Stations > Monitoring > Summary EPN CB

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