R. Gps and O. Center, htm RD2 Analysis of the failure of GPS PRN 23 STNA (now DSNA/DTI), ICAO paper, http://sis-perfandata.cnes.fr/ RD3 Investigation report on ESTB reaction in front of GPS23 failure, N. Suard, CNES report RD4 Continued analysis of ESTB behaviour to the PRN23 event, C. Macabiau, ECDN WGM 10 http://www.eurocontrol.fr/projects/sbas/ RD5 Investigation report on WAAS reaction in front of GPS23 failure, N. Suard, CNES report ACRONYMS ABAS Airborne Based Augmentation System AIVP Assembly, Integration, Validation Platform APV APproach with Vertical guidance CPF Central Processing Facility EGNOS European Geostationary Navigation Overlay Service ENT EGNOS Network Time ESTB EGNOS System TestBed GBAS Ground Based Augmentation, System GNSS Global Navigation Satellite System GPS Global Positioning System HAL Horizontal Alert Limit HPL Horizontal Protection Level ICAO International Civil Aviation Organization MI Misleading Information MOPS Minimum Operational Performance Standard NPA Non Precision Approach PRC PseudoRange Correction PRN Pseudo Random Noise RAIM Receiver Autonomous Integrity Monitoring RGP Réseau GPS Permanent (Permanent GPS Network) RIMS Receiver Integrity Monitoring Station SBAS Satellite Based Augmentation System TSO Technical Standard order UDRE User Differential Range Error WAAS Wide Area Augmentation System, 2004.