TY JOUR TI Diagnostics of HF radio channel: based on data from backscatter ionospheric sounding by continuous chirp signal KW ionosphere KW ionogram KW radio wave propagation KW backscatter ionospheric sounding JO Solar-Terrestrial Physics AU Ponomarchuk, S.N. AU Grozov, V.P. AU Kotovich, G.V. AU Kurkin, V.I. AU Penzin, M.S. PY 2018 IS 4 PB INFRA-M Academic Publishing LLC.