Design Criteria For RNSS Signal Emissions

Hanspeter Kuhlen, Thomas Burger, Brian Barnes and Matt O'Donnell

Abstract:	This paper discusses considerations and design drivers that have led to the signal concept and frequency plan for the European Galileo RNSS system. The resulting baseline signal and frequency plan for GALILEO will be presented in a companion paper by members of the GALILEO Signal Task Force [1]. In this paper we concentrate on the user- perceived service performance and how they drive the signal design and design requirements. The user demand is interpreted from market research conducted in recent European studies such as GALA, GEMINUS, and GALILEI [2,3]. The drivers for signal design are based on three main considerations: (1) service performance characteristics that best serve the anticipated types of applications. (Note that service performance depends on other system and environmental parameters contribute as well); (2) efficient but maximum reasonable use of the available frequency spectrum resources, including the new bands that were allocated to RNSS at the WRC2000 in Istanbul. The resources are differentiated by spectrum bandwidth and permitted aggregated power flux density; and (3) interoperability of GALILEO with GPS to create an improved core element of the next generation GNSS. The latter aspect, highly prized by most potential user communities, means that the signals will have to coexist in frequency bands that are currently or planned to be used by GPS. To make the position and time transfer performance of Galileo attractive for all anticipated user groups wide bandwidth signals are proposed enabling (1) an Open Service (OS), (2) a Commercial Service, (3) a Safety-of- Life Service (SoL), and (4) a Public Regulated Service (PRS). Accuracy, availability and robustness require careful signal design, particularly for operation in the mobile propagation channel. The signal design is further driven by the anticipated receiver processing needed for future dual-system reception (GPS+Galileo) and by RF-section cost constraints particularly associated with the consumer electronics domain. This paper is based upon work conducted within EC, ESA and DLR funded Galileo studies. The views expressed are the opinions of the authors and do not reflect EC/ESA policy.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	278 - 286
Cite this article:	Kuhlen, Hanspeter, Burger, Thomas, Barnes, Brian, O'Donnell, Matt, "Design Criteria For RNSS Signal Emissions," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 278-286.
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