TY JOUR TI DEVELOPMENT OF THE USE OF NONLINEAR DYNAMICS METHODS FOR DETECTING RADIO SIGNALS WITH FREQUENCY-HOPPING SPREAD SPECTRUM USED IN COMMUNICATION CHANNELS OF UNMANNED AERIAL VEHICLES KW uav KW fhss KW radio frequency detection KW hénon map KW approximate model KW nonlinear dynamics JO Siberian Fire and Rescue Bulletin AU Gavrishev, A.A. AU Osipov, D.L. PY 2021 IS 2021 PB FSBEE HE Siberian Fire and Rescue Academy EMERCOM of Russia