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Rate of change of TEC (ROT) and its index (ROTI) are considered agood proxy to characterize the occurrence of ionospheric plasmairregularities like those observed after sunset at low latitudes. SBASs(satellite-based augmentation systems) are civil aviation systems thatprovide wide-area or regional improvement to single-frequency satellitenavigation using GNSS (Global Navigation Satellite System) constellations.Plasma irregularities in the path of the GNSS signal after sunset causesevere phase fluctuations and loss of locks of the signals in GNSS receiverat low-latitude regions. ROTI is used in this paper to characterize plasmadensity ionospheric irregularities in central–western Africa under nominaland disturbed conditions and identified some days of irregularityinhibition. A specific low-latitude algorithm is used to emulate potentialpossible SBAS message using real GNSS data in the western African low-latituderegion. The performance of a possible SBAS operation in the region underdifferent ionospheric conditions is analysed. These conditions includeeffects of geomagnetic disturbed periods when SBAS performance appears to beenhanced due to ionospheric irregularity inhibition. The results of thispaper could contribute to a feasibility assessment of a European Geostationary Navigation Overlay System-based SBAS inthe sub-Saharan African region

Signature of ionospheric irregularities under different geophysical conditions on SBAS performance in the western African low-latitude region