GNSS Performance Monitoring Services with GalTec

W. Ehret, H. Su, O. Glaser, A. Wahl and E. Blomenhofer

Abstract:	This paper presents a concept of integrating different GNSS information sources in one single GNSS Service Centre which provides comparable and understandable information for different user groups and their needs. The first part of the paper will introduce the architecture and concept of GalTeC which is to be understood as a GNSS Service Centre for the Satellite Navigation Systems Galileo, GPS, and EGNOS as a first implementation. GalTeC is based on four corner stones. The first of them is the Satellites Reference Orbit & Clock reconstitution, which serves as the basis of analysis in Signal In Space(SIS) domain. First results of this capability is presented upon the SIS related behaviour of each GPS satellite for a representative time period. The second cornerstone of GalTeC will be the analysis capability in the user domain, accounting raw measurements with all errors along the path. They serve for determination of positions, protection levels (SBAS, RAIM), integrity risks (Galileo). The third cornerstone of GalTeC is its powerful service volume simulation capability for different kinds of constellations and different integrity methods (RAIM, SBAS, GBAS, Galileo Integrity). Within this paper, results will be presented using the new AVIGA Service Availability Module. The module results are the Availabilities of Accuracy, Integrity Risk, Continuity Risk and Availability of Service. The fourth cornerstone of GalTeC is the collection and structured handling and archiving of GNSS monitor station observations and computed data. For the results obtained in this paper the IGS provided observations are used on the one hand and one EGNOS/GPS receiver on the other hand. Finally an outlook on the Services Provision methodology and architecture is given and the offered products are presented showing an example of the internet browser based functionality and styles for condensing the GPS and EGNOS/GPS analysis at staged levels of information depth.
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:	907 - 918
Cite this article:	Ehret, W., Su, H., Glaser, O., Wahl, A., Blomenhofer, E., "GNSS Performance Monitoring Services with GalTec," 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. 907-918.
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