EGNOS Performance Monitoring using the DLR’s Experimental Verification Network

Kurzfassung

The Experimental Verification Network (EVNet) of DLR is an observation and verification platform for GPS, SBAS and in a close future for Galileo. This network has 4 stations regularly distributed over Europe and connected to a processing center located at DLR- Neustrelitz near Berlin. Its modular architecture is suitably designed for verification, testing and monitoring new receiver algorithms and navigation systems with respect to specific application performance requirements. A Network Integrity Monitoring Platform coupled with the EVNet will give the user the possibility to monitor the performances of specific services. EGNOS the European Geostationary Overlay Service is for the moment under validation process. A need has been identified to monitor EGNOS independently by comparing availability of protection levels with respect to standard RAIM protection levels. The results obtained using PRN120 (Actually still used for ESTB the EGNOS System Test Bed but planed to be upgraded for EGNOS) for a 4 day measurement campaign with 4 EVNet stations show lower availability with respect to a standard solution with RAIM protection levels. Nevertheless, degraded performances during an approval phase of a system might be observed and justifies the necessity for continuous monitoring of these services. The DLR’s EVNet with the Network Integrity Monitoring Platform is perfectly designed to fulfill this task as explained in this paper.