@article{abe_signature_2017,
	title = {Signature of ionospheric irregularities under different geophysical conditions on {SBAS} performance in the western African low-latitude region},
	volume = {35},
	issn = {0992-7689},
	url = {https://www.ann-geophys.net/35/1/2017/},
	doi = {10.5194/angeo-35-1-2017},
	abstract = {{\textless}p{\textgreater}{\textless}strong{\textgreater}Abstract.{\textless}/strong{\textgreater} Rate of change of {TEC} ({ROT}) and its index ({ROTI}) are considered a good proxy to characterize the occurrence of ionospheric plasma irregularities like those observed after sunset at low latitudes. {SBASs} (satellite-based augmentation systems) are civil aviation systems that provide wide-area or regional improvement to single-frequency satellite navigation using {GNSS} (Global Navigation Satellite System) constellations. Plasma irregularities in the path of the {GNSS} signal after sunset cause severe phase fluctuations and loss of locks of the signals in {GNSS} receiver at low-latitude regions. {ROTI} is used in this paper to characterize plasma density ionospheric irregularities in central–western Africa under nominal and disturbed conditions and identified some days of irregularity inhibition. A specific low-latitude algorithm is used to emulate potential possible {SBAS} message using real {GNSS} data in the western African low-latitude region. The performance of a possible {SBAS} operation in the region under different ionospheric conditions is analysed. These conditions include effects of geomagnetic disturbed periods when {SBAS} performance appears to be enhanced due to ionospheric irregularity inhibition. The results of this paper could contribute to a feasibility assessment of a European Geostationary Navigation Overlay System-based {SBAS} in the sub-Saharan African region.{\textless}/p{\textgreater}},
	pages = {1--9},
	number = {1},
	journaltitle = {Annales Geophysicae},
	author = {Abe, Oladipo Emmanuel and Otero Villamide, Xurxo and Paparini, Claudia and Ngaya, Rodrigue Herbert and Radicella, Sandro M. and Nava, Bruno},
	urldate = {2020-01-27},
	date = {2017-01-03},
	note = {Number: 1}
}

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SBASs (satellite-based augmentation systems) are civil aviation systems that provide wide-area or regional improvement to single-frequency satellite navigation using GNSS (Global Navigation Satellite System) constellations. Plasma irregularities in the path of the GNSS signal after sunset cause severe phase fluctuations and loss of locks of the signals in GNSS receiver at low-latitude regions. ROTI is used in this paper to characterize plasma density ionospheric irregularities in central–western Africa under nominal and disturbed conditions and identified some days of irregularity inhibition. A specific low-latitude algorithm is used to emulate potential possible SBAS message using real GNSS data in the western African low-latitude region. The performance of a possible SBAS operation in the region under different ionospheric conditions is analysed. These conditions include effects of geomagnetic disturbed periods when SBAS performance appears to be enhanced due to ionospheric irregularity inhibition. The results of this paper could contribute to a feasibility assessment of a European Geostationary Navigation Overlay System-based SBAS in the sub-Saharan African region.\\textless/p\\textgreater","pages":"1–9","number":"1","journaltitle":"Annales Geophysicae","author":[{"propositions":[],"lastnames":["Abe"],"firstnames":["Oladipo","Emmanuel"],"suffixes":[]},{"propositions":[],"lastnames":["Otero","Villamide"],"firstnames":["Xurxo"],"suffixes":[]},{"propositions":[],"lastnames":["Paparini"],"firstnames":["Claudia"],"suffixes":[]},{"propositions":[],"lastnames":["Ngaya"],"firstnames":["Rodrigue","Herbert"],"suffixes":[]},{"propositions":[],"lastnames":["Radicella"],"firstnames":["Sandro","M."],"suffixes":[]},{"propositions":[],"lastnames":["Nava"],"firstnames":["Bruno"],"suffixes":[]}],"urldate":"2020-01-27","date":"2017-01-03","note":"Number: 1","bibtex":"@article{abe_signature_2017,\n\ttitle = {Signature of ionospheric irregularities under different geophysical conditions on {SBAS} performance in the western African low-latitude region},\n\tvolume = {35},\n\tissn = {0992-7689},\n\turl = {https://www.ann-geophys.net/35/1/2017/},\n\tdoi = {10.5194/angeo-35-1-2017},\n\tabstract = {{\\textless}p{\\textgreater}{\\textless}strong{\\textgreater}Abstract.{\\textless}/strong{\\textgreater} Rate of change of {TEC} ({ROT}) and its index ({ROTI}) are considered a good proxy to characterize the occurrence of ionospheric plasma irregularities like those observed after sunset at low latitudes. {SBASs} (satellite-based augmentation systems) are civil aviation systems that provide wide-area or regional improvement to single-frequency satellite navigation using {GNSS} (Global Navigation Satellite System) constellations. Plasma irregularities in the path of the {GNSS} signal after sunset cause severe phase fluctuations and loss of locks of the signals in {GNSS} receiver at low-latitude regions. {ROTI} is used in this paper to characterize plasma density ionospheric irregularities in central–western Africa under nominal and disturbed conditions and identified some days of irregularity inhibition. A specific low-latitude algorithm is used to emulate potential possible {SBAS} message using real {GNSS} data in the western African low-latitude region. The performance of a possible {SBAS} operation in the region under different ionospheric conditions is analysed. These conditions include effects of geomagnetic disturbed periods when {SBAS} performance appears to be enhanced due to ionospheric irregularity inhibition. 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