HAS Phase 2

Enabling Ultra High Accuracy Positioning with advanced correction services

Objective(s) of the Project: 

The activity will investigate, develop, and demonstrate innovative GNSS PPP-RTK positioning algorithms suitable for real-time high accuracy positioning with State Space Representation (SSR) GNSS corrections coming from the Galileo High Accuracy Service (HAS) and other experimental sets of corrections, validated against other sources of SSR corrections like CNES IGS real-time correction dissemination. 

Innovation shall primarily focus on advanced signal filtering techniques for GNSS measurements up to 3 or 4 frequencies to enable robust carrier ambiguity resolution exploiting real-time high accuracy SSR corrections for PPP-RTK, including the application of orbits, clock, biases, ionosphere corrections and their variance-covariance matrix. 

The following objectives are to be achieved: 

• Identify the relevant algorithms for high accuracy positioning with SSR set of corrections, principally focusing on the corrections provided by the Galileo HAS in Phase 1 and its evolutions for Phase 2.
• Define and develop techniques for exploiting ambiguity resolution, ionosphereweighting modelling, and correction accuracy indication for static and kinematic users, taking into account all the necessary metadata collection and pre-processing steps for performing navigation data (PVT) computation with the highest accuracy achievable by
  a determined set of SSR corrections.
• Develop a system for collecting the necessary real data (triple or quadruple frequency GNSS signals, assistance, and corrections data, etc.) and performing all the functions and algorithms involved in the above innovations up to the sequential estimation of the user state vector.
• Test of the developed system in field trials representative of the identified use cases (real collected data) and compare the obtained performances against available solutions and references trajectories.

The task of ANavS within the project is to provide the ANavS SW to design, develop and verify innovative GNSS PPP-RTK positioning algorithms suitable for real-time high accuracy positioning with State Space Representation (SSR) GNSS corrections.