EXPERIMENTAL RESEARCHES OF LEVELS

OF THE INDUCED SIGNALS IN A CURRENT-CARRYING LINE

 

A. N. Katrusha

Military educational and scientific centre of Military-air forces «Military-air academy name of prof. N.E.Zhukovsky and Ju.A.Gagarin »

The paper is received on July 27, 2016

Abstract. Electronic equipment can emit unintentional signals which if properly intercepted and processed allow certain amounts of information to be reconstructed on the base of on these compromising emanations. Furthermore, compromising emanation signals can then escape out of a controlled area by conductive line. Therefore results of electromagnetic interference measurements are actual for the solution of information security estimation problem when signal of the conductive line is leak. Received experimental regularities can be used also for construction and updating of analytical models of information leakage channels. The article considers a simplified model for the formation of interference in conductive lines. The line as wire piece locates in a many-storeyed building room on sufficient distance from absorbing surfaces. The harmonic generator with symmetric antenna was used as an external radiation source. It considers two typical antenna orientations with respect to the line: the antenna axis is parallel and perpendicular to the wire. The article gives measurements results of interference signal levels for two line tapes: a single-wire line and typical networks cable. Based on the moments method the electromagnetic interference levels in a thin wire with isolation was calculated. Also it was taking into account the influence of the underlying surface. The comparative analysis has shown good enough correspondence of experimental researches results and numerical calculations. It was revealed the oscillating character of the current distribution along the wire due to the addition of direct waves and waves reflected from ends of the line. Significant attenuation of signal propagation in the 9 m length line is not detected due to very low losses in the metal wires of the line and the insulation material.

Keywords: a side electromagnetic radiation and induced currents, experimental researches, information protection, attenuation of signals, numerical methods.

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