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Improved Multi-GNSS PPP Software for Upgrading the DEMETRA Project Time Monitoring Service.

Wei Huang^1,2, Pascale Defraigne³, Giovanna Signorile⁴

¹Politecnico di Torino, 10129 Torino, Italy. wei.huang@polito.it.

Sensors (Basel, Switzerland)

|October 17, 2019

Summary

The DEMETRA project enhances precise point positioning (PPP) software with Galileo signals and integer ambiguity resolution. These updates improve time transfer stability and clock monitoring accuracy for users.

Keywords:

DEMETRA GNSS Galileo constrained PPP frequency transfer integer PPP precise point positioning time service time transfer

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Area of Science:

Geodesy and Geophysics
Satellite Navigation Systems

Background:

The H2020 DEMETRA project offers low-latency clock monitoring services.
Atomium precise point positioning (PPP) software from the Royal Observatory of Belgium is utilized.

Purpose of the Study:

Introduce and evaluate three recent updates to the Atomium PPP software.
Demonstrate the advantages of these software enhancements for time users.

Main Methods:

Incorporated Galileo satellite signals into PPP computations.
Implemented a receiver clock constraint option.
Developed PPP with integer ambiguity resolution.

Main Results:

Combining Galileo and Global Positioning System (GPS) signals enhances frequency stability.
Receiver clock constraints reduce noise and enable continuous or robust clock solutions.
Integer PPP provides continuous clock solutions and improves mid- to long-term frequency transfer stability.

Conclusions:

The updated Atomium software significantly improves precise point positioning and time transfer capabilities.
New features offer enhanced clock monitoring services with greater stability and accuracy.