Integrity Testcase Experimentation Results Within GSTB-V1

Wolfgang Werner, Ingrid Deuster and Francisco Amarillo Fernandez

Abstract:	Within the European Galileo Satellite Test Bed (GSTBV1) experiments are conducted with the goal of assessing Galileo integrity performance and consolidating integrity architecture. For this reason an experimental integrity processing facility (E-IPF) has been developed and put into place within the GSTB-V1 processing centre (GPC). The routine operation of the system has begun in the first half of this year and the system is now generating a set of daily and long-term core products based on real GPS data but with Galileo navigation and integrity algorithms. First experiments cover mainly the pre-processing and the integrity system budget allocation. Within the first experimentations the performance of the complete preprocessing chain is analysed in terms of total range and synchronisation error. It turns out that for the purpose of integrity processing the pre-processing of raw measurements is a critical trade-off between few high-accuracy or many low-accuracy measurements that will be a major contributor to overall integrity performance. The signal-in-space monitoring accuracy (SISMA) has been analysed. The signal in space error (SISE) is an (instantaneous) value composed of the components orbit and clock error, which needs to be estimated as accurate as possible by the E-IPF. Valid SISE estimation candidate algorithms for the Galileo integrity system are a tangential plane estimation algorithm as well as a (robust or non-robust) direct error component estimation algorithm at the satellite coming from earlier phases of the Galileo project. This paper presents the current status of the integrity experimentation and provides the first results obtained so far in the pre-processing and SISMA performance areas based on the GSTB-V1 sensor station network.
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:	1653 - 1662
Cite this article:	Werner, Wolfgang, Deuster, Ingrid, Fernandez, Francisco Amarillo, "Integrity Testcase Experimentation Results Within GSTB-V1," 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. 1653-1662.
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