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Open AccessArticle

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

1
Politecnico di Torino, 10129 Torino, Italy
2
Observatoire Royal de Belgique, 1180 Brussels, Belgium
3
Istituto Nazionale di Ricerca Metrologica, 10135 Torino, Italy
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4389; https://doi.org/10.3390/s19204389
Received: 30 August 2019 / Revised: 8 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
The H2020 DEMETRA project provides short latency clock monitoring services to the time users using the Atomium precise point positioning (PPP) software developed by the Royal Observatory of Belgium. In this paper, three recent updates of the current Atomium software are introduced: adding Galileo signals in the PPP computation; the option to constrain the receiver clock; PPP with integer ambiguity resolution. The advantages of these updates are demonstrated: Combining the Galileo and global positioning system (GPS) signals for PPP time transfer will further improve the frequency stability inside the computation batch; PPP with receiver clock constraint is not only used to reduce the short-term noise of the clock measurements but can also be used for some specific applications to a keep continuous clock solution in the computation batch or retrieve correct clock measurements from extremely noisy environments; the integer PPP allows a continuous clock solution, and improves the mid-term and long-term stability of the frequency transfer compared to the current PPP frequency transfer techniques. View Full-Text
Keywords: precise point positioning; GNSS; time transfer; frequency transfer; Galileo; constrained PPP; integer PPP; DEMETRA; time service precise point positioning; GNSS; time transfer; frequency transfer; Galileo; constrained PPP; integer PPP; DEMETRA; time service
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Huang, W.; Defraigne, P.; Signorile, G.; Sesia, I. Improved Multi-GNSS PPP Software for Upgrading the DEMETRA Project Time Monitoring Service. Sensors 2019, 19, 4389.

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