Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Analysis of the Efficiency of Code Structures of SDV-HF and VHF Radio Lines of High-Reliable Special and Dual Purpose Systems YU.YU. GROMOV, M.YU. TITOV, P.I. KARASEV The article discusses the use of code structures in VLF, HF and VHF radio links used in highly reliable special and dual-purpose systems. Calculations of the probabilistic characteristics of code structures are presented. Estimates of the probability of stable reception of various types of signals used in the corresponding code structures are presented. Keywords: highly reliable special and dual-use systems, codes, efficiency of code structures, radio links, signals. DOI: 10.25791/pribor.7.2021.1272 Pp. 01-12.