Ionospheric Modelling in the North of Algeria
作者： H Dekkiche , S Kahlouche , C.B Kadri , R Mir
DOI: 10.1007/978-3-540-85426-5_78
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摘要: The knowledge of the ionospheric behaviour is an important factor in GPS positioning. Data five ALGEONET (Algerian GEOdynamical NETwork) and a hundred IGS stations are processed with Bernese software, which based on use spherical harmonic expansion, to provide mapping Total Electronic Content (TEC). used model supposes that whole free electrons concentrated thin layer altitude varying between 250 450 km. Results obtained for several heights (350, 400 km) 2-hourly resolution. maximal value TEC north Algerian area about 20 (midnight) 60 (midday) TECU, such values day April 30, 2001, refers high solar activity period sunspot number 112. Calculated thereafter applied correct single frequency solution. comparison corrected $L1$ ionosphere-free solutions shows effects involve network contraction. Also, solution close one; baselines hundreds kilometers, deviations 10 cm (in horizontal coordinates), they reduced by 50% vertical component
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