PPP-Serve - Network Based GNSS Phase Biases to Enhance PPP Applications – A New Service Level of GNSS Reference Station Provider

Regularly established RTK (Real Time Kinematic) techniques are based on building and processing observation differences while the required observation corrections are forwarded to the user community in standardized RTCM format.

In contrast to the differencing technique, the PPP (Precise Point Positioning) model is based on code/phase single point positioning, which requires a limited amount of correction data by transferring model parameters instead of observation corrections. Leading manufacturers have agreed on a new RTCM standard (RTCM 3.2, State Space Representation = SSR) which supports PPP.

New receiver hardware and software issued from 2012 onwards will be capable to process this standard. GNSS service providers must thus adapt to this situation by offering new service levels. Unfortunately global SSR information like satellite orbit and clock correction models do not allow for phase ambiguity resolution in real-time and therefore PPP still suffers from long convergence times (10-30 minutes).

In a further step PPP-Serve aims at the provision of so-called satellite phase biases which are the missing link at user side to allow for PPP-based phase ambiguity resolution. Applying relevant satellite phase biases will reduce the convergence times down to a few seconds. Both currently known techniques for establishing these phase biases will be investigated. Software to determine these parameters from the observation data of the regional GNSS service provider EPOSA will be established. Finally these parameters are forwarded to the user community in a proprietary format as a new service level.

Aside from GPS based positioning, the project also addresses the aspect of how to use GLONASS satellite signals and the processing of relevant GLONASS phase biases. Investigations concerning Galileo IOV (In-Orbit Validation) signals depend on the availability of the IOV signals during the project life span.

Coordinator

Vienna University of Technology
Institute of Geodesy and Geophysics
Robert Weber
Gußhausstraße 27-29
A-1040 Vienna
Tel.: +43 (1) 58801 - 12865
E-mail: robert.weber@tuwien.ac.at
Web: http://hg.geo.tuwien.ac.at/

Partners

• Graz University of Technology,Institute of Navigation - Katrin Huber
• WIEN ENERGIE Stromnetz GmbH - Christian Klug

Vienna University of Technology - Institute of Geodesy and Geophysics
Robert Weber
Gußhausstraße 27-29
A-1040 Vienna
Tel.: +43 (1) 58801 - 12865
E-mail: robert.weber@tuwien.ac.at
Web: http://hg.geo.tuwien.ac.at/