Improved Signal in Space Accuracy Based on Matrix Indicators

L. Fernández, C. Catalán, A. Mozo, F. Amarillo

Abstract:	Galileo GNSS System broadcasts two indicators of the navigation and integrity data quality: SISA and SISMA, respectively. From this information a user can more accurately determine its position and also the confidence he can place in the correctness of that position solution. In principle, this accuracy and reliability vary within the satellite footprint. However, as SISA and SISMA are scalar bounds that shall cover all users in the satellite footprint, they are computed for the worst location, penalizing the rest of the users. We have developed a method to estimate SISA and SISMA in matrix form. From these matrixes, users can reconstruct the error bound that applies to their specific location, instead of using the largest bound in the satellite coverage area. We will show that with the new matrix indicators, errors are more accurately bounded in the satellite service area, reducing the scalar bounds by more than 60%. We will also show the benefits that can be achieved in terms of service availability.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2839 - 2851
Cite this article:	Fernández, L., Catalán, C., Mozo, A., Amarillo, F., "Improved Signal in Space Accuracy Based on Matrix Indicators," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2839-2851.
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