EGNOS High Integrity System Test Bed (HISTB) Transition to Dual Frequency and Galileo Augmentation

J-A. Gicquel, B. Charlot, D. Joly, D. Lekaim, M. Jeannot

Abstract:	In the frame of the “European GNSS Evolution Program” (EGEP), ESA is preparing the next version of EGNOS, in the so-called EGNOS V3 project. This project is completing its phase B, with the aim of pursuing to development phases. EGNOS V3 aims at taking benefit from the evolution of new constellations and signals, and more specifically from the deployment of the Galileo constellation and the availability of bi-frequency signals on both GPS and Galileo constellations. In order to bring more confidence in simulations results, including notably field testing, Test Beds have been developed in the frame of EGEP. Among them, HISTB has been designed to assess future EGNOS services for aeronautical users. The experimentations done up to end 2013 have provided the following results: • The feasibility of SBAS algorithms to process future GPS frequencies (L1 with L2C or L5) is ensured. These results validate the capability to handle next GPS generation to provide EGNOS legacy service. • SBAS algorithms are able to process dualfrequency/multi constellation data. • Tests with GPS and Galileo simulated data show the interest of using both constellations. • The first SBAS augmentation of real Galileo IOV satellites signals has also been performed, already showing the benefit of it. • Finally, it has been shown that a SBAS configured by using GPS and Galileo is robust to the loss of Galileo constellation, in particular without loss of integrity. The new aspects developed in this paper are the ones done in the second phase of the project (since beginning 2014): • Consolidate initial results by studying, for the legacy service, the transition from the current EGNOS service (based only on L1/L2P frequencies) via a likely transient phase (based on L1 and a mix of L2P, L2C and L5) and eventually to the future EGNOS service (based on L1/L5 frequencies) • Assess the impact on performances of the relaxed refresh rate of satellite corrections introduced by the new SBAS L5 standard [3]. • Develop an independent SBAS integrity check for GPS/Galileo configurations and assess its performances. This is the continuation of the first phase where GPS/Galileo simulations have been done without this independent check. • Perform a demonstration with an aircraft to show the interest of dual frequency and multi constellation augmentation system and assess preliminary performances.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	1754 - 1763
Cite this article:	Gicquel, J-A., Charlot, B., Joly, D., Lekaim, D., Jeannot, M., "EGNOS High Integrity System Test Bed (HISTB) Transition to Dual Frequency and Galileo Augmentation," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 1754-1763.
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