TY JOUR TI Aircraft Direction Finding by Estimating the Doppler Frequency of Received Radio Signals KW automatic direction finder KW aircraft KW Doppler filter KW radio emission source KW coherent accumulation KW bearing KW radio signal KW radio communication station KW Doppler frequency JO Infocommunications and Radio Technologies AU Sinitsyn, E.. AU Friedman, L.. PY 2021 IS 4 PB Federal State Educational Institution of Higher Education Sevastopol State University