Instituto Brasileiro de Geografia e Estatística

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Geodesy

Real-time PPP

The Department of Geodesy of IBGE inaugurated, through NTRIP Caster, a new service called Real-Time Precise Point Positioning, or simply “Real-Time PPP”. The real-time IGS Project brought forward a way of accessing orbits and errors of precise watches, by means of corrections inserted in real-time messages.

Therefore, in order to do real-time PPP, users should have a receiver sending data to a PC, in the RTCM 3.0, and have access to corrective flows, to the orbit and watch made available by IBGE’s Caster. Corrective flows, together with the GNSS data flows being received in the application BNC client (BKG NTRIP Client) in the PC, are used for data processing. The BNC application is available on (http://igs.bkg.bund.de/ntrip/download).

Corrective flows and orbits get the following identification in IBGE’s Caster:

Identification or Mountpoint Reference System GNSS Description
IGS03 ITRF2008 GPS+GLONASS Orbit correction and watch
SIRGAS200001 SIRGAS2000 GPS Orbit correction and watch
SIRGAS200002 SIRGAS2000 GPS+GLONASS Orbit correction and watch
RTCM3EPH GPS Assistido GPS+GLONASS Transmitted orbits

The user logged in the RBMC-IP service has automatic access to the flows mentioned above. For a SIRGAS solution, SIRGAS00001 (only for GPS receivers) or SIRGAS0002 (for GNSS receivers) and RTCM3EPHO should be selected. These flows are received by the application BNC client through IP 186.228.51.52 door 2101.

In case a corporate network protected by firewall or proxy is used, the service might not work.