Performance Analysis of the New Ephemeris Sets in Galileo Second Generation (G2G) and their Impact on a Real-Time Receiver

Freddy A. Pinto-Benel, Carlos Moriana-Varo, Esteban Garbin-Manfredini, Rodrigo M. Romero-Gaviria, Rodrigo Silverio Orbiso, Sergio Blesa Jiménez, José M. Masó Llinàs, Enik Shytermeja, Enik Shytermeja, Gianluca Caparra, Luciano Musumeci, Vicente Lucas Sabola, Jose A. Garcia-Molina

Abstract:	The Galileo Second Generation (G2G) introduces innovative signal and data dissemination mechanisms aimed at improving Global Navigation Satellite System (GNSS) performance for both mass-market and Internet of Things (IoT) receivers. Central to these advancements are Quasi-Pilot (QP) signals, designed to reduce acquisition complexity and power consumption, and fastdata components capable of transmitting high-rate navigation messages. Among them, the Enhanced Reduced Ephemeris (EnhRedCED) enables the broadcast of orbital and clock parameters for up to 15 satellites, drastically reducing the time-to-firstfix (TTFF). This paper presents a detailed analysis of the impact of the new ephemeris sets on receiver performance, focusing on their implementation within GMV’s Galileo Second Generation Test User Receiver Non-PRS (G2TURN). The receiver exploits QP signals for acquisition and time retrieval, while integrating fast-data dissemination for rapid ephemeris demodulation. Performance is assessed under different environmental conditions (open-sky and urban) and operational states (cold, warm, and hot starts), evaluating the TTFF reduction in real-world receivers. The findings confirm that the new ephemeris structures of Galileo G2G enable faster and more robust positioning without compromising accuracy, thus representing a major step forward in GNSS receiver design.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	3000 - 3007
Cite this article:	Pinto-Benel, Freddy A., Moriana-Varo, Carlos, Garbin-Manfredini, Esteban, Romero-Gaviria, Rodrigo M., Orbiso, Rodrigo Silverio, Jiménez, Sergio Blesa, Llinàs, José M. Masó, Shytermeja, Enik, Shytermeja, Enik, Caparra, Gianluca, Musumeci, Luciano, Sabola, Vicente Lucas, Garcia-Molina, Jose A., "Performance Analysis of the New Ephemeris Sets in Galileo Second Generation (G2G) and their Impact on a Real-Time Receiver," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 3000-3007. https://doi.org/10.33012/2025.20292
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