Interoperability Test Analysis between EGNOS and MSAS SBAS Systems

Jorge Nieto, Joaquín Cosmen, Ignacio García, Javier Ventura-Traveset, Isabel Neto, Kazuaki Hoshinoo

Abstract:	Europe, US/Canada and Japan are currently developing their own regional Satellite Based Augmentation Systems (SBAS). Although all SBAS are regional systems, it is recognised the necessity to establish adequate ways for co-operation and co-ordination among the different SBAS providers, in order to provide SBAS interoperability, and, in turn, produce a more effective implementation and a part of a seamless world-wide navigation system. Although interoperability implies a large variety of com-plex issues (such as certification, standards, safety, op-erations,…), in this paper we discuss only architectural and technical interoperability options. In particular, an assessment of different interoperability options between EGNOS and MSAS SBAS systems will be presented. This assessment is based on the use of both EGNOS and MSAS respective test beds. SBAS providers guarantee only adequate service provi-sion in their nominal service volumes. In spite of this, SBAS broadcast signals will be available anywhere in their respective GEO footprints. In the case of EGNOS and MSAS the GEO visibility areas is extended to the whole Asian continent. In that intermediate region (interoperability area), signals for both GEO (i.e. from both SBAS) are available but none of the SBAS provid-ers considers it as part of its nominal service area. It means that the level of service available in this region is not defined. Taking into account that these intermediate regions are not covered by any other SBAS, the possibil-ity of providing a minimum service level in the interme-diate region by means of SBAS interoperability is a main concern of the interoperability analyses. For this purpose, several scenarios can be conceived. These are discussed and analysed through this paper. Europe, US/Canada and Japan are currently developing their own regional Satellite Based Augmentation Systems (SBAS). Although all SBAS are regional systems, it is recognised the necessity to establish adequate ways for co-operation and co-ordination among the different SBAS providers, in order to provide SBAS interoperability, and, in turn, produce a more effective implementation and a part of a seamless world-wide navigation system. Although interoperability implies a large variety of com-plex issues (such as certification, standards, safety, op-erations,…), in this paper we discuss only architectural and technical interoperability options. In particular, an assessment of different interoperability options between EGNOS and MSAS SBAS systems will be presented. This assessment is based on the use of both EGNOS and MSAS respective test beds. SBAS providers guarantee only adequate service provi-sion in their nominal service volumes. In spite of this, SBAS broadcast signals will be available anywhere in their respective GEO footprints. In the case of EGNOS and MSAS the GEO visibility areas is extended to the whole Asian continent. In that intermediate region (interoperability area), signals for both GEO (i.e. from both SBAS) are available but none of the SBAS provid-ers considers it as part of its nominal service area. It means that the level of service available in this region is not defined. Taking into account that these intermediate regions are not covered by any other SBAS, the possibil-ity of providing a minimum service level in the interme-diate region by means of SBAS interoperability is a main concern of the interoperability analyses. For this purpose, several scenarios can be conceived. These are discussed and analysed through this paper.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	221 - 232
Cite this article:	Nieto, Jorge, Cosmen, Joaquín, García, Ignacio, Ventura-Traveset, Javier, Neto, Isabel, Hoshinoo, Kazuaki, "Interoperability Test Analysis between EGNOS and MSAS SBAS Systems," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 221-232.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In