TY JOUR TI Comparative Analysis of Precise Positioning Methods for Unmanned Aerial Vehicles KW UAV routing KW GNSS KW DGPS KW RTK KW PPP KW correction signals KW precise positioning JO Intellectual Technologies on Transport AU Lipanov, I.D. AU Khomonenko, A.D. AU Molodkin, I.A. PY 2025 IS 0 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"