TY JOUR TI Features of backscatter ionospheric sounding as studied with a chirp ionosonde KW ionosphere KW ionogram KW radio wave propagation KW backscatter ionospheric sounding JO Solar-Terrestrial Physics AU Ponomarchuk, S.N. AU Kurkin, V.I. AU Penzin, M.S. PY 2017 IS 3 PB INFRA-M Academic Publishing LLC.