Context

PPP WIZARD ODTS : The PPP-WIZARD demonstrator is a ‘proof of concept’ of the zero-difference ambiguity resolution method developed and patented by CNES. PPP USER : The PPP-User uses corrections from the PPP-Wizard demonstrator or from another IGS analysis center and GNSS (GPS, Glonass, Galileo, BeiDou) measurements to compute the user position within 1cm accuracy (in real or non-real time).

CS Group responsabilities for Precise Point Positioning With Integer and Zero-difference Ambiguity Resolution Demonstrator are as follows:

Maintenance and software developments.
Maintenance of the operational pipeline producin correction streams.
Maintenance of the platform for online services (correction data streams).
GNSS study analysis.

Main Picture

The features are as follows:

PPP-WIZARD : Real-time orbit determination and Time synchronisation and computation of clock and phases biaises for multiple constellations based on a station network
Connection to data streams from IGS and REGINA, EUREF and AUSCOR. Broadcasting of computed products in SSR formats USER : Centimetric-level user position computation software, based on ODTS products.
Monitoring ODTS corrections. Automatic calculation of reference stations positions

Project implementation

The project objectives are as follows:

Development, maintenance and surveillance of the PPP-WIZARD ODTS.
Development and maintenance of the PPP USER software.
Analysis : Impact of ionosphere and station networks
Analysis: HAS Galileo service performance

The processes for carrying out the project are:

V cycle

Technical characteristics

The solution key points are as follows:

C++
Computation of ODTS corrections
Transmission of correction data stream through a caster
Use of these corrections by the PPP USER

Archi Picture

The main technologies used in this project are:

Domain	Technology(ies)
Hardware environment(s)	OVH server
Operating System(s)	Linux - Debian
Programming language(s)	C++ / Shell / Python
Production software (IDE, DEVOPS etc.)	Scilab ; BNC; GIT