EGNOS Open Service Guidelines for Receiver Manufacturers

David Jimenez-Banos, Matthew Powe, Ankit Raj Mathur, Felix Toran, Didier Flament, Eric Chatre

Abstract:	Satellite Based Augmentation Systems (SBAS) consist of a network of reference stations distributed over a wide area that monitor the status of GPS and other Global Navigation Satellite Systems (GNSS). These reference stations send the data collected on the status of GPS to a master station where differential corrections and integrity are computed for every monitored satellite. Once these are computed a ground Earth station uplinks them to geostationary satellites that broadcast this information to the end user. Examples of SBAS systems are the European Geostationary Navigation Overlay Service (EGNOS), the U.S. Wide Area Augmentation System (WAAS), the Japanese Multifunctional Transport Satellite Augmentation System (MSAS), and the Indian GPS and GEO Augmented Navigation (GAGAN). In the recent years SBAS systems have been topic of much study for Safety of Life (SoL) applications. User communities such as civil aviation have extensively used these kinds of systems relying on the accuracy benefits they provide but above all on the use of integrity. SBAS-enabled GNSS receivers for these applications have been designed and manufactured according to the recognized standards [1]. The standards have been developed by the civil aviation community and therefore solely address the use of SBAS for this type of safety-critical operations. This has provided receiver manufacturers with a clear view on how to design their products for SBAS SoL service. However, no similar guideline exist for less stringent applications that could strongly benefit from SBAS but do not require implementation of the very conservative algorithms elaborated for aviation. Focusing on the particular case of EGNOS, besides the SoL service (declared operational on March 2011), the Open Service (OS) has been readily available and free to the public since October 2009. Since then most manufacturers have partially followed [1] for the design of their products. This has lead to several different implementations that in some cases may not be optimal. The objective of this paper is to present a work plan to produce set of clear guidelines for GNSS receiver manufacturers on how to properly make use of the EGNOS broadcast messages to improve their positioning accuracy measurements for Open Service. This topic was discussed in the context of the SBAS Interoperability Working Group (IWG) and the interest for such guidelines was confirmed by other SBAS providers.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2505 - 2512
Cite this article:	Jimenez-Banos, David, Powe, Matthew, Mathur, Ankit Raj, Toran, Felix, Flament, Didier, Chatre, Eric, "EGNOS Open Service Guidelines for Receiver Manufacturers," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 2505-2512.
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