Galileo System Performance Status Report

V. Oehler, J.M. Krueger, T. Beck, M. Kirchner, H.L. Trautenberg, J. Hahn, D. Blonski

Abstract:	The Galileo project is currently finalizing its design and development phase with the related major segment CDR milestones that have been successfully passed for the Ground Mission Segment and the Test User Segment in 2008, and which will be finalized in 2009 for the Space Segment. All achieved segment performances are now flown up to system level to critically review the System design in mid 2009. The present paper summarizes the Galileo System performance status at such System CDR milestone and fully reflects the current segment, sub-segment, and system development status accordingly. Within the paper all major segment CDR performance findings including over-compliances or possible specification violations with respect to the key performance drivers are highlighted, and their impact on the Galileo services is derived. Such service performance impact derivation also considers possible System level mitigation and/or recovery activities, like segment performance re-allocations according to related compliance levels, system concept modifications considering optimized (according to segment CDR status) service derivation approaches (local SISMA consideration, different SISA levels, normal environments instead of worst-case only, etc.), or even system performance derivation for different service types and user expectations. Beside such design and development CDR status, the paper also highlights the currently achievable system performance considering early verification results coming from lower level measurement campaigns and verification activities, as well as from early in-orbit test results with the experimental GIOVE-A and GIOVE-B satellites, which are already for various contributors considered representative for the final Galileo satellite performances. The same system mitigation and recovery concepts considered for the design and development status are also applied for this early system performance verification status. Thus, the present paper summarizes the current Galileo project status at System CDR from system performance point of view in line with the current designed and developed status, as well as the most realistic system performance status based on real measurements, properly extrapolated to the full constellation. All results are presented in detailed service availability maps over Europe/ECAC, WAAS region, world-wide, etc. and depending on the deployed constellation and service expectations, i.e. according to the Galileo System Requirements Document (GSRD), the Galileo Mission Requirements Document (MRD), or other relevant positioning accuracy or integrity service specifications, like LPV-200 or APV-I, etc.
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:	2956 - 2966
Cite this article:	Oehler, V., Krueger, J.M., Beck, T., Kirchner, M., Trautenberg, H.L., Hahn, J., Blonski, D., "Galileo System Performance Status Report," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2956-2966.
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