TY JOUR TI Application of system analysis to find the optimal structure of a nonlinear frequency–modulated signal in radar air traffic control systems KW air traffic control KW primary processing KW signal with nonlinear frequency modulation KW signal-to-noise ratio KW side lobes KW uncertainty function JO Modeling of systems and processes AU Pelevin, A.S. PY 2026 IS 19 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov