This four-year project is the algorithmic development of a PPP-RTK network platform for the analysis and processing of multi-constellation, multi-frequency GNSS data of Australian CORS stations, with the goal to enable single-receiver GNSS users to perform carrier-phase ambiguity resolved precise point positioning, otherwise known as PPP-RTK.

There are two project components which will contribute to the CRCSIs Analysis Centre Software (ACS).

The PPP-RTK network project will be a comprehensive library of advanced, single to multi-frequency GNSS PPP-RTK un-differenced network processing algorithms for the determination of user-required PPP-RTK parameters.The PPP-RTK network processor will also output the numerical estimation and quality description of the network parameters. These parameters are:

  • Satellite and receiver clock errors
  • Multi-frequency satellite and receiver code biases
  • Multi-frequency satellite and receiver phase biases
  • Ionospheric delays
  • Zenith tropospheric delays.

For the single-receiver PPP-RTK user, method and algorithms will also be provided that allow smooth transformations between the different varieties of possible PPP-RTK corrections. 

The second project, Multi-GNSS integration, will develop a comprehensive library of advanced, single to multi-frequency algorithms for the optimal and numerically efficient integration of multiple GNSS constellations into the PPP-RTK network processor.This will further enhance the PPP-RTK network capability to any combination of GNSSs.

The GNSS inclusion is done in the order of GPS, BeiDou, Galileo, and Glonass, with RNSSs in parallel when possible.The GNSS-specific network parameters of each of these GNSSs will be determined, together with their PPP-RTK user corrections.

Method and algorithms for the network determination of the multi-GNSS inter and intra-frequency ISB/ISTBs will also be provided.