Permanent GNSS Stations - portal.survey.ntua.gr

Permanent GNSS Stations(GNSS – Global Navigation Satellite System)

Dionyssos Satellite Observatory

• Monument stability

• Obstacle free

• Interference free

• Data Streaming capability

Main Public Organizations

• IGS : International GNSS Servicehttp://www.igs.org/

• EUREF : European Geodetic Reference Systemshttp://www.euref.eu/

EUREF GNSS Network

EUREF in Greece

NTUA DSO

Station (DYNG) at Dionyssos Satellite Observatory (NTUA-CNES)

Trimble Net R9

Installed at May 2011

IGS, EUREF, REGINA networks

https://space-geodesy.nasa.gov/docs/2011/02_REGINAhostingsitev1_en.pdf

http://itrf.ensg.ign.fr/doc_ITRF/RT121_POYARD_DionysosITRFCo-locationSurvey.pdf

NTRIPprotocol for streaming GPS data over the Internet

• NTRIP : 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 segmentCollecting & streaming GNNS data

- SSR (Space State Representation) segmentComputing & streaming SSR (ephemeris/clock corrections)

!!!! REAL TIME !!!!

NTRIP modules

EUREF CASTERReal-Time GNSS Data Streams From EUREF-IP Ntrip Broadcaster

www.euref-ip.net:2101

IGS CASTERReal Time SSR (Ephemeris/clock corrections) streaming table

products.igs-ip.net:2101

1 or 2 receivers ?

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

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 !

PPP procedure

Mainly used Ntrip software(open source)

• BNC https://igs.bkg.bund.de/index/index

pros : extremely accurate PPP

cons : only PPP, not so user friendly

• RTKLib http://www.rtklib.com/pros : user friendly environment, DGPS, RTK,PPP

cons : not so accurate real time PPP

Permanent GNSS Stations - portal.survey.ntua.gr

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