Determination of the Spectral Separation Between Signals and its Effect on the GNSS Receiver Performance. A More Pragmatic Approach

David Fernandez Prim, Michael Schoenhuber, Otto Koudelka

Abstract:	The present satellite positioning and navigation technology is clearly evolving towards an aggregate System of Systems. In the near future, a number of GNSS constellations will be orbiting the Earth (i.e. the North American GPS, the Russian GLONASS, the European Galileo or the Chinese BeiDou-2, among the most relevant), and several additional navigation signal components (L1C and L2C in GPS or CDMA signals proposed for GLONASS), will be made available to both civilian and military users to complement currently existing services. Furthermore, the presence of several regional augmentations (the North American WAAS, the European EGNOS and the Japanese MSAS), and the upcoming constitutions of a number of new systems (i.e. the Japanese QZSS or the Indian GAGAN -towards the global coverage, as IRNSS-) will introduce additional complexity to this composite global scheme, making interoperability and compatibility more tedious. For completeness, the consideration of a range of nonnavigation related interfering sources in certain radio navigation bands (i.e. UWB emissions, out-of-band radiation from analog/digital television transmitters, DME/TACAN stations or primary/secondary surveillance radar emissions, especially in GPS L5/Galileo E5 bands) adds complication to the analysis. Therefore, in a worstcase future scenario, literally tens of signal components will have to be considered in the interference level evaluation on a given target navigation receiver, making of this an extremely time-consuming task, only possible through hardware and/or software simulations. In this contribution, the dependency of accuracy and computation time of spectral separation coefficients with the numerical methods in use will be studied, a number of results presented, and several practical conclusions drawn from the pertinent simulation cases, making this study as much applicable as possible for the design and implementation of future software simulation tools. Furthermore, a more pragmatic methodology to be followed in order to reduce the runtime of simulations dealing with Doppler-dependent spectral separation coefficients will be proposed
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	2669 - 2676
Cite this article:	Prim, David Fernandez, Schoenhuber, Michael, Koudelka, Otto, "Determination of the Spectral Separation Between Signals and its Effect on the GNSS Receiver Performance. A More Pragmatic Approach," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 2669-2676.
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