1. Permanent GNSS Stations (GNSS – Global Navigation Satellite System)
Dionyssos Satellite Observatory

2. Dionyssos Satellite Observatory
Must
Monument stability
Obstacle free
Interference free
Data Streaming capability
Dionyssos Satellite Observatory

3. Main Public Organizations
IGS : International GNSS Service
EUREF : European Geodetic Reference Systems
Dionyssos Satellite Observatory

4. Dionyssos Satellite Observatory
EUREF GNSS Network
Dionyssos Satellite Observatory

5. Dionyssos Satellite Observatory
EUREF in Greece
NTUA DSO
NOA
AUTH
INSU
TUC
Dionyssos Satellite Observatory

6. Station (DYNG) at Dionyssos Satellite Observatory (NTUA-CNES)
Trimble Net R9
Installed at May 2011
IGS, EUREF, REGINA networks
Dionyssos Satellite Observatory

7. Dionyssos Satellite Observatory

8. NTRIP protocol for streaming GPS data over the Internet
Networked Transport of RTCM via Internet Protocol
RTCM : Radio Technical Commission for Maritime Services
developed by the German Federal Agency for Cartography and Geodesy (BKG) and the Dortmund University Department of Computer Science
- GNSS Data segment
Collecting & streaming GNNS data
- SSR (Space State Representation) segment
Computing & streaming SSR (ephemeris/clock corrections)
!!!! REAL TIME !!!!
Dionyssos Satellite Observatory

9. Dionyssos Satellite Observatory
NTRIP modules
Dionyssos Satellite Observatory

10. Dionyssos Satellite Observatory
NTRIP modules
Dionyssos Satellite Observatory

11. Dionyssos Satellite Observatory
EUREF CASTER Real-Time GNSS Data Streams From EUREF-IP Ntrip Broadcaster
Dionyssos Satellite Observatory

12. Dionyssos Satellite Observatory
IGS CASTER Real Time SSR (Ephemeris/clock corrections) streaming table products.igs-ip.net:2101
Dionyssos Satellite Observatory

13. Dionyssos Satellite Observatory
1 or 2 receivers ?
Dionyssos Satellite Observatory

14. Positioning Techniques
Single : One receiver, acc. 2-30m
Relative : 2 Receivers
Static acc. < 1-2 cm
DGPS acc. < 1m
Kinematic acc. < 5cm fixed , < 20cm float
PPP : One receiver (SSR input), acc. <10cm
NTRIP
Dionyssos Satellite Observatory

15. Dionyssos Satellite Observatory
RTK vs. PPP
RTK: “Tell me the precise location of your reference station and I will tell you the precise location of your mobile receiver.” 
PPP: ”Tell me the precise location of the navigation satellites and I will tell you the precise location of your mobile receiver.”  
Static (with precise orbits) does both !
Dionyssos Satellite Observatory

16. Dionyssos Satellite Observatory
PPP procedure
Dionyssos Satellite Observatory

17. Mainly used Ntrip software (open source)
BNC
pros : extremely accurate PPP
cons : only PPP, not so user friendly
RTKLib
pros : user friendly environment, DGPS, RTK,PPP
cons : not so accurate real time PPP
Dionyssos Satellite Observatory

18. Dionyssos Satellite Observatory
Other Links
PPP-Wizard project
Orbits & Clock corrections
Dionyssos Satellite Observatory

19. BNC PPP in progress Station LAMY (Lambadario)
Dionyssos Satellite Observatory