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

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/.

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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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