Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Application of SDR Technology to Detect Technical Channels of Information Leakage A.S. PORKHUN, A.V. DUSHKIN, A.V. GUREEV, YU.V. SAVCHENKO, V.A. SHCHERBAKOV This work is devoted to the development of a method and means of protecting acoustic speech information from leakage due to highfrequency irradiation based on SDR (Software definition radio) technology. One of the dangerous technical channels of leakage of acoustic speech information from the premises is an active leakage channel created by high-frequency irradiation of auxiliary technical means or semi-active laying devices installed in the room. Based on the results of the system analysis, the requirements for a means of detecting highfrequency radiation signals are substantiated, an analysis of possible construction schemes is carried out and a block diagram of a means of detecting high-frequency radiation signals is substantiated. The following is a description of a laboratory stand consisting of an ultra-highfrequency SMB 100A signal generator, a software-defined HackRF One radio system and a laptop on which the software developed by the authors is deployed. The results of experimental studies on the detection of high-frequency radiation signals are presented. Keywords: acoustic speech information, high-frequency radiation, information security, software-defi ned radio system, leakage. DOI: 10.25791/pribor.11.2022.1372 Pp. 26-33.