The GEMINUS Proposed Galileo Services:- Evolution of GNSS

M. Ziya Arif, Serge Brami, Pablo Haro and Raniero Pasquali

Abstract:	Galileo is being designed to be a global satellite-based navigation system under European civil control. It is to be independent but compatible with the existing satellite- based navigation systems (Global Positioning System, GPS, and Global Navigation Satellite System, GLONASS). The information presented in this paper summarises the interim views of the Galileo European Multimodal Inte- grated Navigation User Service (GEMINUS) study consortium for Galileo’s services. These services have not been formally endorsed by the European Commission (EC) or other European bodies. However, a final set of Galileo services will emerge towards the end of this year when the EC is expected to harmonise these proposed services with recommendations from other studies. The GEMINUS project is one of a number of EC-funded project definition studies for Galileo, and the aims of the GEMINUS study are: • To define the Galileo Service. • To define the business structure for the Galileo Op- erator which meets the requirements of both the EC and the Provider Consortium. • To validate the study with Case Studies which will examine many levels of the service provision value chain. The objective of this paper is to present a set of services that are commercially and technically viable, with suffi- cient market potential to merit being offered by Galileo. The methodology adapted here to identify the Galileo ser- vices is basically a market driven one, that is, Galileo shall offer what the market wants. Therefore, market siz- ing and market requirement analyses are being employed as the defining tools and techniques to derive Galileo’s services. The basic services that Galileo should offer are position- ing, velocity, time (PVT) dissemination and navigation- related communication services. These services should be offered globally to a large number of user communities (aviation, land, maritime, etc) equipped with Galileo re- ceivers. It is envisaged that there will be an Open Access Service (OAS), a Regional Safety Service (RSS), a Time Service and a Navigation Related Communication Service (NRS). The latter can be bundled with either OAS or RSS. Each service will be tailored to the users’ require- ments in a manner similar to the current GPS Standard Positioning Service (SPS) and Precise Positioning Service (PPS). In addition, there will be a Government Access Service (GAS) to be provided on separate frequencies. The provision of this service should be controlled by a highly secure access control mechanism. This paper focuses mainly on the technical requirements of the identified potential services and also specifies and defines the service design drivers qualitatively as well as quantitatively, in terms of Required Navigation Perform- ance (RNP) parameters (or attributes) and levels of cover- age. RNP parameters include accuracy, integrity, continu- ity, and availability while levels of coverage include global, regional and local. The RNP parameters will form the basis of differentiation between distinct service levels. This paper also considers the safety-critical aspects of the Galileo services.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	1798 - 1806
Cite this article:	Arif, M. Ziya, Brami, Serge, Haro, Pablo, Pasquali, Raniero, "The GEMINUS Proposed Galileo Services:- Evolution of GNSS," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 1798-1806.
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