Combined Galileo/GPS Frequency and Signal Performance Analysis

José Ángel Ávila Rodríguez, Markus Irsigler, Guenter W. Hein and Thomas Pany

Abstract:	After many years of complex talks, the European Union and the United States agreed in June 2004 on a common baseline for the future GPS and Galileo signals, in particular on L1. Quite recently (mid of 2004) a few more important changes in the Galileo waveforms on L1 and E6 had to carry out which are outlined in the paper. Then the paper pretends to show the theoretical potential performance of the new baseline signals of Galileo and its counterpart GPS in terms of position accuracy and discusses the impact of the signal modulation on the overall error budget. The absolute position accuracy is assessed by means of the error budget and consequently, special attention will be paid on its main error contributions. Thus, the atmospheric errors, multipath and ranging noise performance represent an obligated topic in this work. By analysing worst case and typical scenarios, we are giving realistic estimations of the performance of the European and American GNSS. This is of extreme importance because the future market of Galileo depends basically on the services it will be capable to cover. Finally the results of all the investigations presented in this paper show the real accuracy potential of Galileo services and that of a combined Galileo/GPS system. The governmental Galileo Public Regulated Service (PRS) and the military GPS M-code were not considered in this paper.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	632 - 649
Cite this article:	Rodríguez, José Ángel Ávila, Irsigler, Markus, Hein, Guenter W., Pany, Thomas, "Combined Galileo/GPS Frequency and Signal Performance Analysis," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 632-649.
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