EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium C. Bruyninx, J. Legrand, F. Roosbeek EPN Central Bureau Royal Observatory

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

C. Bruyninx, J. Legrand, F. Roosbeek

EPN Central BureauRoyal Observatory of Belgium

http://epncb.oma.be/

GNSS Network Management GNSS Network Management Procedures: Application to the EPNProcedures: Application to the EPN


203 permanent GNSS stations30 % GPS+GLONASS91 % hourly 44 % real-time40 % IGS

38 countries

Background Background > Status > Guidelines > Tracking > Monitoring > Status > Guidelines > Tracking > Monitoring > Summary > Summary

Real-timeHourly

Daily


BACKGROUND BACKGROUND > GUIDELINES > NEW STATIONS > MONITORING > SUMMARY> GUIDELINES > NEW STATIONS > MONITORING > SUMMARY


Site guidelines – Difference between IGS and EPN guidelines

Hourly and daily data flow 2004-2005Dependence on one regional data centre

Guidelines for real-time data 2006EUREF-IP Pilot Project

Antenna Calibrations 2006IGS switch to APCV



BACKGROUND BACKGROUND > > GUIDELINES GUIDELINES > NEW STATIONS > MONITORING > SUMMARY > NEW STATIONS > MONITORING > SUMMARY

IGS ≠ EPNIGS ≠ EPN


Dec. 2004: guidelinesSpring 2005: implementation



BACKGROUNDBACKGROUND > > GUIDELINES GUIDELINES > NEW STATIONS > MONITORING > SUMMARY > NEW STATIONS > MONITORING > SUMMARY

DATA FLOWDATA FLOW


Result:

-2 regional data centers :

OLG (Austria) and BKG (Germany)

95% 99%(BRST, BSCN,CAGZ,KELY, PUYV, QAQ1, RABT, THU3, TRAB, VFCH) (REDU, TRAB)



BACKGROUND BACKGROUND > > GUIDELINES GUIDELINES > NEW STATIONS > MONITORING > SUMMARY> NEW STATIONS > MONITORING > SUMMARY

AANTENNANTENNA


- 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, RAWConverter to RINEX needs to be freely available



BACKGROUND BACKGROUND > > GUIDELINESGUIDELINES > NEW STATIONS > MONITORING > SUMMARY > NEW STATIONS > MONITORING > SUMMARY

REAL-TIMEREAL-TIME


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



BACKGROUNDBACKGROUND > > GUIDELINESGUIDELINES > NEW STATIONS > MONITORING > SUMMARY > NEW STATIONS > MONITORING > SUMMARY

AANTENNANTENNA


Abs. calib. from robot 69%Converted field calib. 16%Uncal. pairs 15%

Nov. 2006




AANTENNANTENNA


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




AANTENNANTENNA


May 2008Indiv. abs. calib 8%True abs. calib 69 % 77%Calib. from field 11%No calib. 12%

Dec. 2006Indiv. abs. calib., 5%True abs.calib 64% 69%Calib. from field 14%No calib. 17%




AANTENNANTENNA


GEO++ letter to IGS

August 2nd, 2007



BACKGROUNDBACKGROUND > > GUIDELINES GUIDELINES > NEW STATIONS > MONITORING > SUMMARY> NEW STATIONS > MONITORING > SUMMARY

AANTENNANTENNA


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 log3. Operational Centre Form4. Digital Station Pictures5. 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 verifications7. Once passed the EPN CB verifications, EPN ACs are contacted (3 ACs needed)8. EUREF mail to announce new EPN station



BACKGROUNDBACKGROUND > GUIDELINES > > GUIDELINES > NEW STATIONS NEW STATIONS > MONITORING > SUMMARY> MONITORING > SUMMARY

PROCEDUREPROCEDURE


EPN CB Verifications

Daily Hourly Real-time

Availability x x x

Latency x x x

Meta-data x x

Quality x

Daily&hourly metrics

90% availability requested in 2 RDC90% below 10 min. latency (hourly)Last 7 days

Real-time metrics 90% availability at regional broadcasterLatency: Simulate user and download stream using 2-hour samples



BACKGROUND BACKGROUND > GUIDELINES > > GUIDELINES > NEW STATIONS NEW STATIONS > MONITORING > SUMMARY> MONITORING > SUMMARY

VERIFICATIONSVERIFICATIONS


OSJE (Croatia) RTCM3.0 0.5 sBRUS (Belgium) RTIGS 1.8 sBELL (Spain) RTCM3.0 3.5 s






EPN CB VerificationsDaily Hourly Real-time

Availability BKG/OLG x x

Latency x x x

Meta-data x x

Quality x

DailyMeta-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






EPN CB Verifications

Daily Hourly Real-time

Availability x x x

Latency x x x

Meta-data x x

Quality x






Data quality verification : - Teqc-based - tracking plots

Tracking at low elevations:- elevation cut off angle- L2-obstructions






Stations are not included in EPN as long as all criteria are not fulfilled




SUMMARYSUMMARY


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



BACKGROUND BACKGROUND > GUIDELINES > NEW STATIONS > > GUIDELINES > NEW STATIONS > MONITORING MONITORING > SUMMARY> SUMMARY

WEBWEB


EUREFmail• Monthly reports on latency of hourly data • Weekly reports on availability and meta-data consistency in daily data

Extended reports under developmenteg availability and latency of real-time data

MAILSMAILSBackground Background > Status > Guidelines > Tracking > Monitoring > Status > Guidelines > Tracking > Monitoring

> Summary > SummaryBackground Background > Status > Guidelines > Tracking > Monitoring > Status > Guidelines > Tracking > Monitoring

> Summary > SummaryBACKGROUND BACKGROUND > GUIDELINES > NEW STATIONS > > GUIDELINES > NEW STATIONS > MONITORING MONITORING > SUMMARY> SUMMARY


Interaction with EUREF Analysis Centerseuref.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)

ANALYSIS CENTRESANALYSIS CENTRESBackground Background > Status > Guidelines > Tracking > Monitoring > Status > Guidelines > Tracking > Monitoring

> Summary > SummaryBackground Background > Status > Guidelines > Tracking > Monitoring > Status > Guidelines > Tracking > Monitoring

> Summary > SummaryBACKGROUND BACKGROUND > GUIDELINES > NEW STATIONS > > GUIDELINES > NEW STATIONS > 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?



BACKGROUND BACKGROUND > GUIDELINES > NEW STATIONS > MONITORING > > GUIDELINES > NEW STATIONS > MONITORING > SUMMARYSUMMARY



Background Background > Management > Guidelines > New Stations > > Management > Guidelines > New Stations > MonitoringMonitoring > Summary > Summary EPN CBEPN CB







Documents

EPN Central Bureau IGS Analysis Workshop 2008, Miami Royal Observatory of Belgium C. Bruyninx, J. Legrand, F. Roosbeek EPN Central Bureau Royal Observatory