Abstract
This article contains an analysis of GNSS (Global Navigation Satellite System) integrity from a viewpoint of railway transportation. The integrity concept of functional EGNOS (European Geostationary Navigation Overlay Service) system is explained in detail and also the integrity mechanism of the future Galileo system is briefly outlined. In order to verify the theoretical conclusions, static measurements by means of EGNOS receiver in a safety mode have been performed. Selected experimental results are discussed.
Highlights
EGNOS dependability attributes as quality measures of one of subsystems must be determined - according to the railway safety concept
The EGNOS system is certificated for use in avionic safety critical applications, but in railway applications it is necessary to analyze the real performance of the system on the earth ground and to validate the fulfillment of EGNOS parameters on earth ground, and so to verify the theoretical properties of the system
The integrity mechanism of EGNOS system was analyzed in the article
Summary
Before a satellite navigation system such as EGNOS or Galileo can be used in railway safetyrelated applications, it is necessary to perform a risk analysis of the whole railway safetyrelated system and specify its safety integrity and dependability requirements. It is mandatory to perform the risk analysis according to the railway safety standards (EN 50126, EN 50129, etc.). For this reason, EGNOS dependability attributes as quality measures of one of subsystems must be determined - according to the railway safety concept
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