ESTIMATION AND ANALYSIS OF PROTECTION LEVELS FOR PRECISE APPROACH AT RIO DE JANEIRO INTERNATIONAL AIRPORT USING REAL TIME σVIG FOR EACH GPS AND GLONASS SATELLITE

Abstract: Determinations of the vertical ionospheric gradient standard deviation (σvig ) in real time to each Global Positioning System (GPS) and Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) satellite available Ground-Based Augmentation (GBAS) Rio de Janeiro International Airport (SBGL) were used estimates Horizontal Vertical Protection Level (HPL/VPL). For this purpose two software developed: MoR_Ion_RT (real threat assessment for GBAS Brazil) SBGL_PL (calculation SBGL HPL/VPL), whose methods equations are presented paper. Since such determinations transmit condition at an approaching aircraft, they also allow performing screening data, based on Conterminous United States (CONUS) Threat Model threshold. Experiments carried out indicate that it is possible attend CAT-I during autumn (most affected season) using GPS or GLONASS satellites, provided restrictions established by a temporal model developed region applied (avoid satellites with elevations between 10° 37°). It was found use conjunction makes meet CAT-III Alert Limit (HAL/VAL), since has better geometric configuration.