Radiation Produced by Pulse Sequences: Possibilities of Selecting and Masking Them

摘要

Spectral and temporal Peculiarities of spurious electromagnetic radiation of digital devices for data processing and transmission are considered. It is shown that even a slight difference in the pulse-front form allows one to perform selection of radiation from different units of these devices. Selecting spurious radiation and restoring pulse sequences in the course reception of this radiation are possible only if the received signal is much stronger than noise. To provide communication security, it is recommended to create around enciphering and deciphering terminals an electromagnetic noise field, whose level is somewhat higher than the natural back- ground noise.