# Presentation: 412030

## 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/*

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

## 203 permanent GNSS stations

- 		30 % GPS+GLONASS
- 		91 % hourly
- 		44 % real-time
- 		40 % IGS
- 38 countries

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

- Real-time
- Hourly
- Daily

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

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

**Notes:**
Today the EPN consists of 200 permanent tracking stations. Since the last EUREF symposium 11 station joined the EPN. These station are indicated on the map with circles. You can see that we have our first station in Northern Ireland (Belfast) and in Estonia (Tallin).
1 station located at Spain was removed from the EPN because it seemed impossible to gather good quality GPS observations from that site anymore.

## Site guidelines – 

**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

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

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

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

**IGS ≠ EPN**

**Notes:**
In the 8-channel ROGUE SNR-8000 receivers, the receiver firmware uses another algorithm for the selection of the satellites to be tracked as can be seen from these plots.

## Dec. 2004:  guidelines

- Dec. 2004:  guidelines
- Spring 2005: implementation

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

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

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

**DATA 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       ****>       Status        >       Guidelines       >       Tracking       >       Monitoring       >      Summary**

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

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

**A****NTENNA**

##  EUREF-IP Pilot Project : 2002-2007

-  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

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

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

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

**REAL-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

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

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

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

**A****NTENNA**

## Nov. 2006

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

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

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

**A****NTENNA**

## 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

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

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

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

**A****NTENNA**

## 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%

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

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

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

**A****NTENNA**

## GEO++ letter to IGS

- August  2nd, 2007

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

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

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

**A****NTENNA**

## 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

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

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

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

**PROCEDURE**

**Notes:**
This table gives the details of the new stations included in the EPN. As you can see all stations provide hourly data, 3 of them stream data in real time and 5 provide GLONASS as well as GPS data. We will come back to the last column later on.

## 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 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

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

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

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

**VERIFICATIONS**

**Notes:**
This map shows the EPN stations classified following their data flow. The stations indicxated in blue provide real-time data streams, those in green provide near real-time or houlry data and the ones in red provide only daily data; We hope that with time the red dots on the map will dissapear.

## OSJE (Croatia)	       RTCM3.0        0.5 s

- OSJE (Croatia)	       RTCM3.0        0.5 s
- BRUS (Belgium)      RTIGS	    1.8 s
- BELL (Spain)	       RTCM3.0        3.5 s

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

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

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

**VERIFICATIONS**

## EPN CB Verifications

|  | Daily | Hourly | Real-time |
| --- | --- | --- | --- |
| Availability | BKG/OLG | x | x |
| Latency | x | x | x |
| Meta-data | x |  | x |
| Quality | x |  |  |

- _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

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

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

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

**VERIFICATIONS**

**Notes:**
This map shows the EPN stations classified following their data flow. The stations indicxated in blue provide real-time data streams, those in green provide near real-time or houlry data and the ones in red provide only daily data; We hope that with time the red dots on the map will dissapear.

## EPN CB Verifications

|  | Daily | Hourly | Real-time |
| --- | --- | --- | --- |
| Availability | x | x | x |
| Latency | x | x | x |
| Meta-data | x |  | x |
| Quality | x |  |  |

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

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

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

**VERIFICATIONS**

**Notes:**
This map shows the EPN stations classified following their data flow. The stations indicxated in blue provide real-time data streams, those in green provide near real-time or houlry data and the ones in red provide only daily data; We hope that with time the red dots on the map will dissapear.

## Data quality verification :   -   Teqc-based 			

- Data quality verification :   -   Teqc-based
- 			   -   tracking plots
- Tracking at low elevations:
-  elevation cut off angle
-  L2
- obstructions

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

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

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

**VERIFICATIONS**

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

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

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

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

**SUMMARY**

**Notes:**
This map shows the EPN stations classified following their data flow. The stations indicxated in blue provide real-time data streams, those in green provide near real-time or houlry data and the ones in red provide only daily data; We hope that with time the red dots on the map will dissapear.

## 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       ****>       Status        >       Guidelines       >       Tracking       >       Monitoring       >      Summary**

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

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

**WEB**

## 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

**MAILS**

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

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

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

## 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)

**ANALYSIS CENTRES**

**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?

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

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

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

## Slide 23

## EPN CB

**EPN CB**

## EPN CB

**EPN CB**

## EPN CB

**EPN CB**

## EPN CB

**EPN CB**