GNSS Network Management Procedures Application to the EPN

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking

EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

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

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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/ EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring > >> SUMMARY Summary 203 permanent GNSS stations 30 % GPS+GLONASS 91 % hourly 44 % real-time 40 % IGS 38 countries Real-time Hourly Daily EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary IGS ≠ EPN Site guidelines – Difference between IGS and EPN guidelines ü Hourly and daily data flow 2004 -2005 Dependence on one regional data centre ü Guidelines for real-time data EUREF-IP Pilot Project 2006 ü Antenna Calibrations IGS switch to APCV 2006 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary DATA FLOW Dec. 2004: guidelines Spring 2005: implementation EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary ANTENNA Result: -2 regional data centers : OLG (Austria) and BKG (Germany) 95% (BRST, BSCN, CAGZ, KELY, PUYV, QAQ 1, RABT, THU 3, TRAB, VFCH) EPN Central Bureau IGS Analysis Workshop 2008, Miami 99% (REDU, TRAB) Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary ANTENNA November 2006 IGS switch to APCV • Absolute calibrations ü converted field calibrations (elev dependency, probl. below 10°) ü 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary ANTENNA Nov. 2006 Abs. calib. from robot Converted field calib. Uncal. pairs EPN Central Bureau 69% 16% 15% IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary ANTENNA Dec. 2006 Indiv. abs. calib. , 5% True abs. calib 64% Calib. from field 14% No calib. 17% EPN Central Bureau 69% May 2008 Indiv. abs. calib 8% True abs. calib 69 % Calib. from field 11% No calib. 12% IGS Analysis Workshop 2008, Miami 77% Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary PROCEDURE Procedure for inclusion of new EPN stations: 1. 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 2. Site log 3. Operational Centre Form 4. Digital Station Pictures 5. If site log is approved : Start daily+ hourly data flow to primary and secondary data centres + real-time data flow to real-time broadcaster 6. EPN CB verifications 7. Once passed the EPN CB verifications, EPN ACs are contacted (3 ACs needed) 8. EUREF mail to announce new EPN station EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary VERIFICATIONS EPN CB Verifications Daily Hourly Real-time Availability x x x Latency x x x Meta-data x Quality x x 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary VERIFICATIONS OSJE (Croatia) BRUS (Belgium) BELL (Spain) EPN Central Bureau IGS Analysis Workshop 2008, Miami RTCM 3. 0 0. 5 s RTIGS 1. 8 s RTCM 3. 0 3. 5 s Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary VERIFICATIONS EPN CB Verifications Daily Hourly Real-time BKG/OLG x x Latency x x x Meta-data x Quality x Availability Daily Meta-data verification: RINEX data versus site log but, including antenna serial number! Real-time (RTCM format) antenna/radome type, antenna height, station coordinates EPN Central Bureau IGS Analysis Workshop 2008, Miami x Similar to IGS 2 hour samples Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary VERIFICATIONS Data quality verification : - Teqc-based - tracking plots Tracking at low elevations: - elevation cut off angle - L 2 -obstructions EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY Summary SUMMARY Stations are not included in EPN as long as all criteria are not fulfilled EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY 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 EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring >>> SUMMARY 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) EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

BACKGROUND Background >> > Background Status GUIDELINES >> Guidelines > NEW STATIONS >> Tracking Status Guidelines Tracking> >>MONITORING Monitoring > >> SUMMARY 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? EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium

Background > Management > Guidelines > New Stations > Monitoring > Summary EPN CB EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium