EGNOS High Integrity System Test Bed (HISTB): A First Implementation of Dual Frequencies Multi Constellations Standard

D. Joly and C. Lopez de Echazarreta

Abstract:	In the frame of the “European GNSS Evolution Program” (EGEP), ESA prepared the Preliminary Design phase of the next version of EGNOS, the so-called EGNOS V3. EGNOS V3 will improve the performances offered to the user taking benefit from the evolution of new constellations and signals, and more specifically from the deployment of the Galileo constellation and the availability of dual frequency signals on both GPS and Galileo constellations. The single-frequency L1 SBAS standard [1] is not compatible with these new features and thus a new standard is currently being drafted called DFMC for Dual Frequencies Multi Constellation standard [2] and [3]. In a previous phase of the HISTB project, a first implementation of the EGNOS algorithms to monitor Galileo satellites and augment a dual frequency signal was studied. The results were presented in a paper featured in ION-GNSS 2015 (EGNOS High Integrity System Test Bed (HISTB): Transition to Dual Frequency and Galileo Augmentation). These first results were based on real datasets and confirmed the benefit brought by the usage of multi-constellation and dual frequency improving the performance offered to EGNOS users communities. The experiments were performed using an adaptation of the SBAS L1 standard. This paper is the logical continuation of this previous work with a most up to date implementation of SBAS L5 DFMC standard through: • The assessment of the performance offered with different Galileo constellation deployment states. Experiments were performed with 11 Galileo satellites (February 2017 dataset) and 15 Galileo satellites (August 2017). • The re-use of the dataset studied in previous experiments with 4 Galileo satellites (November 2014), which allowed to compare the performances obtained between the L1-like and DFMC standard. These experimentations were performed using: • Raw measurements collected from real in-field receivers (e.g. from deployed stations networks such as IGS, EUREF, MGEX and Galileo Experimental Sensor Stations –GESS). • An evolved version of the simulation platform (SPEED version 2), which enables a more flexible use and easy adaptation to future Multi-frequency / Multi-constellation data standard. • Evolved versions of the EGNOS processing and integrity check algorithms covering the dual-frequency / multi-constellation augmentation. • A set of tools dedicated to performance assessment of dual-frequency / multi-constellation users (accuracy, availability, integrity, continuity, service area) An overview of HISTB mission and architecture will be presented followed by the summary of the results from the previous experimentations. Then, the results of the new set of experiments will be presented, including description of the results. Finally the last part will provide the plans and status for the future.
Published in:	Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018) September 24 - 28, 2018 Hyatt Regency Miami Miami, Florida
Pages:	2134 - 2141
Cite this article:	Joly, D., de Echazarreta, C. Lopez, "EGNOS High Integrity System Test Bed (HISTB): A First Implementation of Dual Frequencies Multi Constellations Standard," Proceedings of the 31st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018, pp. 2134-2141. https://doi.org/10.33012/2018.15850
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