IMPROVEMENT OF PROTECTIVE EFFECTS ON DANGEROUS HIGH-FREQUENCY IMPRESSION SIGNALS

Abstract

The interception of information that is discussed at the objects of information activity or processed by technical means can be carried out by means of special effects on the elements of technical means. One of the effective methods of such influence is high-frequency imposition, in which channels of information leakage are formed due to acoustoelectric transformations, which are formed during the simultaneous impact on the elements of technical means of confidential signals and a probing high-frequency signal, if radical measures were not taken to prevent the penetration of currents of high frequency into technical means. Processes of formation of technical channels of information leakage by methods of high-frequency imposition, method of technical protection of information from interception by these methods, the essence of which consists in the application of combined active interference, which changes the properties of dangerous signals of high-frequency imposition, are considered. The purpose of the work is to improve the protective effects on dangerous signals formed by high-frequency imposition to ensure the maximum possible destruction of their informative parameters and, as a result, reliable blocking of information leakage channels. The perspective of using quadrature generators of radio signals for the formation of protective signals not only relative to the fundamental frequency, but also relative to the harmonics of the dangerous signal is considered. The advantage of quadrature shapers is the possibility of performing modulation in them in a fairly wide range of changes in both modulating and carrier frequencies without rebuilding the circuit due to the absence of controlled reactive elements and frequency-sampling circuits. The stages of formation of output phase-modulated signals are considered, a structural diagram is given that implements the quadrature method of increasing the angular modulation index. As a result, it is believed that the considered method of forming radio-electronic interference simultaneously on several harmonics of the carrier frequency and ensuring the specified values of the modulation indices on each of them provide a basis for its use in the formation of protective effects on dangerous signals formed by high-frequency imposition, where an increase in the coefficient is required the quality of noise disturbances with angular modulation, as well as increasing the distance of influence.