Galileo E1 OS and GPS L1C Pseudo Random Noise Codes - Requirements, Generation, Optimization and Comparison -

Stefan Wallner, Jose-Angel Avila-Rodriguez, Guenter W. Hein, and Joseph J. Rushanan

Abstract:	With the introduction of the future Galileo signals as well as with GPS L1C, new Pseudo Random Noise (PRN) Code structures that are not based on Linear Feedback Shift Registers (LFSR) will be employed for the very first time in the history of civilian GNSS. Instead of this well known code generation approach, completely different schemes will be followed by both GPS and Galileo. GPS L1C will use Weil-based codes derived from a single Legendre sequence while the Galileo E6 CS and E1 OS signals will implement random codes optimized via genetic algorithms. Since these are two completely different procedures for code optimization, this paper will try to shed some light on both code designs. Furthermore, this paper will present pros and cons of both designs. Finally, in order to have the fairest comparison between both approaches, sample code sets have been generated using the two schemes. As GPS L1C and Galileo E1 OS will transmit their signals at a center frequency of 1575.42 MHz with an identical Power Spectral Density (PSD) of MBOC(6,1,1/11) it is obvious that both PRN code families could potentially affect each other. This paper will also deal with this topic. For simplicity in the notation, we will refer to this aspect as intersystem crosscorrelation.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1549 - 1563
Cite this article:	Wallner, Stefan, Avila-Rodriguez, Jose-Angel, Hein, Guenter W., Rushanan, Joseph J., "Galileo E1 OS and GPS L1C Pseudo Random Noise Codes - Requirements, Generation, Optimization and Comparison -," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1549-1563.
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