TY JOUR TI Assessment of GNSS multipath effects using open source software KW multipath KW GNSS measurements KW automated satellite monitoring system KW RINGO KW criteria for assessing multipath KW International GNSS Service JO Izvestia Vuzov. Geodesy and Aerophotosurveying AU Kosarev, N.S. PY 2025 IS 69 PB MIIGAiK