TY JOUR TI Basic principles of onboard positioning systemcorrectness test by railway automation means KW ERTMS/ETCS KW interval train traffi c control system KW radio block system center KW track circuit KW digital radio channel KW satellite navigation KW coordinates KW onboard cab equipment KW ERTMS/ETCS JO Transport automation research AU Popov, P.. AU Korolev, I.. AU Mylnikov, P.. PY 2015 IS 1 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"