GALILEO Integrity Performance Assessment (GIPA)

In this paper the Galileo integrity performance assessment (GIPA) project is briefly described. In the frame of this project a tool is developed which will be used for Galileo integrity performance assessment. The main application of this simulator will be to analyse several critical issues of the Galileo baseline architecture. These critical issues are mainly assumptions that are not yet satisfyingly justified. A set of ten use cases have been defined to cover these issues. These will be presented in the first part of the paper. Considering the GIPA tool development, most of the necessary integrity and satellite-navigation algorithms are already available in different IfEN in-house tools (which will not be described here). The main task of the tool development is to adapt and incorporate all these algorithmic models into the GIPA simulator kernel. The tool will be a near end-to-end simulator with Monte-Carlo capabilities, based on a very flexible architecture, that allows to perform all the specified use cases. The second part of the paper will present the current status of this simulator development. Finally, two detailed algorithms for global integrity checking are presented in the last part of the paper together with some initial results. These early results have been obtained with the IfEN in-house tool GIPS (Ground Integrity Performance Simulator). As they are not the results of an end-to end simulation, they have to be considered with caution, but can serve as first indicators for achievable performance.