Technical Assessment of Signal Structures for the Galileo Satellite Navigation System

Robert Schweikert, Thomas Woerz, Riccardo De Gaudenzi

Abstract:	The American Global Positioning System (GPS) originally devised as a military positioning system, has triggered the de-velopment of a tremendous amount of civil applications based on positioning and timing services. GPS is rapidly moving toward an enhanced hybrid military/civil system trough the addition of new carriers. The strategic role of satellite-based navigation and time distribution motivated the European authorities to develop its own complementary global naviga-tion satellite system (GNSS). In February 1999, the European Commission officially announced the European initiative, called Galileo [EC99], and laid out the EC’s view on the key features and high-level requirements of the envisaged global satellite-based navigation system (GNSS). Few years before the Galileo communication, the European Space Agency (ESA) initiated preliminary studies to investigate the key as-pects of a future GNSS. In this contribution, we focus on the results on code and car-rier phase jitter performance of narrow-band (4 MHz) and wide-band (20 MHz) signals in the presence of a HPA and multipath/fading channels. The results are based on a signal structure developed in one of the ESA funded research activ-ity: “Signal Design and Transmission Performance Study for GNSS-2” [SDS98] [NTM99]. This study was actually com-pleted before the EC Galileo communication and conse-quently does not satisfy fully the current system requirements; in particular the need for a security control access was not part of the investigation. However, the investigated narrow- and wide-band signals are still seen as applicable modules for the on-going Galileo definition. In section 3 a description of the investigated signals is pro-vided. Section 4 is divided into two main parts. After defining the relevant properties of a HPA the results of code phase tracking are given in the presence of a HPA and a subsequent filter. Then the code and carrier phase tracking behaviour with respect to multipath/fading channels is illuminated.
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:	2139 - 2148
Cite this article:	Schweikert, Robert, Woerz, Thomas, De Gaudenzi, Riccardo, "Technical Assessment of Signal Structures for the Galileo Satellite Navigation System," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 2139-2148.
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