TY JOUR TI Asessment of the effectiveness of models used for ionospheric correction of GNSS measurements KW GNSS KW GNSS receiver KW ionospheric models KW ionospheric measurement correction KW Klobuchar model KW NeQuick-G KW IRI KW total electron content JO Izvestia Vuzov. Geodesy and Aerophotosurveying AU Kupriyanov, A.O. AU Morozov, D.A. AU Zamogil'nyy, D.. PY 2025 IS 69 PB MIIGAiK