Towards the Early Adoption of ARAIM Services: PROARAIM Experimentation Campaign Results

J. Gabriel Pericacho, José Celada, David Sánchez, Konrad W. Janicki, Alessandra Calabrese, Fernando Díaz, Xavier Quiles, Victor Arribas, Javier Andrés, Juan Ibañez, Carlos López de Echazarreta

Abstract:	The Advanced Receiver Autonomous Integrity Monitor (ARAIM) concept is being developed as an evolution of the previous RAIM technology. The Receiver Autonomous Integrity Monitoring (RAIM) technique has been widely used in aviation GNSS receivers as an Aircraft Based Augmentation System (ABAS) augmentation to GNSS core constellations. Nowadays it is based on GPS L1 and protects from single satellite faults. The ARAIM concept takes advantage of the GNSS modernisation programs, using the new constellations and signals available for civil aviation navigation. ARAIM includes the capability to detect and exclude multiple satellite faults, up to constellation faults, based on the constellation characteristics received via an Integrity Support Message (ISM). The initial ARAIM service will support a Horizontal ARAIM solution (H-ARAIM), and it is expected to highly improve horizontal navigation availability, providing superior performance compared to traditional RAIM. Later, the ARAIM service will also support a Vertical ARAIM solution (V-ARAIM). ARAIM services will increase the alternatives available for an Air Navigation Service Provider (ANSP) to choose the most suitable navigation means to develop an airspace efficient and safe for use. The advent of new GNSS services in support of flight operations requires introducing new technologies and procedures that allow the continuous monitoring of their compliance to the accuracy, integrity, continuity, and availability performance requirements specified in ICAO SARPs. Besides, availability predictions are also required to improve the continuity performance of a GNSS service. In this context, the PROARAIM project aims to ease the early adoption of ARAIM services through the pre-development and experimentation of some of the key elements needed to validate and approve the future use of ARAIM to support flight operations, with the here called ARAIM tool suite. The PROARAIM project is co-founded by ESA as part of the NAVISP program and carried out by ENAIRE, the main Spanish Air Navigation Service Provider; and GMV, one of the key players in Europe in GNSS augmentation infrastructure and services. The present paper aims to share the results of the experimentation campaign in which ENAIRE has tested the ARAIM tool suite developed by GMV to cover the following use cases: • ARAIM service (fault free receiver) past compliance at a specific location/area: Determine the performances of an ARAIM fault free receiver using a set of core satellite constellations during a past period of time at a specific location/area, and report the level of compliance of the ARAIM services with respect to the GNSS Signal-in-space (SIS) performance requirements. • ARAIM service (real receiver) past compliance at a specific location: Determine the performances of an ARAIM real receiver using the GNSS raw data recorded during a past period of time at a specific location, and report the level of compliance of the ARAIM services with respect to the GNSS SIS performance requirements. • ARAIM service (fault free receiver) prediction consultation at a specific location: Consult the prediction of availability outages for an ARAIM fault free receiver using a set of core satellite constellations to support a specific flight operation for a near-future time interval at a selected location. • ARAIM service (on-board receiver) past compliance during a flight: Determine the performances of an ARAIM on-board real receiver using the GNSS raw data recorded during a flight, and report the level of compliance of the ARAIM services with respect to the GNSS SIS performance requirements applicable to the flown flight operations. Each use case is addressed by a set of experiments, covering both the nominal case, where all signals from all used constellations are available, and degraded cases, where there is only one frequency available per constellation, or just one usable GNSS constellation. Also, these experiments will assess ARAIM performances against different flight navigation requirements (e.g., RNAV-1 for SID/STAR and RNP APCH down to LNAV, LNAV/VNAV and LPV minima), using a H-ARAIM or a V-ARAIM solution as per flight operation.
Published in:	Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022) September 19 - 23, 2022 Hyatt Regency Denver Denver, Colorado
Pages:	217 - 237
Cite this article:	Pericacho, J. Gabriel, Celada, José, Sánchez, David, Janicki, Konrad W., Calabrese, Alessandra, Díaz, Fernando, Quiles, Xavier, Arribas, Victor, Andrés, Javier, Ibañez, Juan, de Echazarreta, Carlos López, "Towards the Early Adoption of ARAIM Services: PROARAIM Experimentation Campaign Results," Proceedings of the 35th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2022), Denver, Colorado, September 2022, pp. 217-237. https://doi.org/10.33012/2022.18359
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