The urgency of the improvement of methods and means of protection of radio electronic means (REM) due to the development and application of high–power electromagnetic radiation (EMR) generators with ultrashort pulses duration (UPD) is substantiated. It is pointed out that it is possible to solve the problem of REM protection by the complex application of plasma technologies using gaseous and modified solid–state media. By analyzing the known achievements in the field of developing effective methods and creating protection facilities for REM, a number of unresolved problems in the field of creation of plasma protection technologies have been determined. The technique of solving the formulated problems is presented and the main relations are obtained to determine the expediency of using the proposed technology in the interests of the REM integrated protection from the powerful EMR UPD. A relation is made for the breakdown criterion in a gaseous plasma medium that relates the value of the breakdown field to the concentration of charged particles determined by the ionization source. The structure of a solid–state plasma medium is described, which can be used as a protective shield. The order of finding the REM screening coefficient is shown, based on the determination of the distribution function of charged particles for finding the main macroscopic properties of plasma by solving the kinetic equation of the Lenard–Balescu equation. A relation is given for the damping coefficient of an electromagnetic wave in solid–state plasma. Numerical estimates are presented in the form of graphs showing the possibility of using plasma technology to protect the REM from a powerful EMR through possible channels of penetration. The discussion of the obtained results is presented and it is indicated on the possibility and prospects of using the proposed technology for REM protection, especially with limitations on the weight dimensions of protection devices

CENS by comparing its fragments with the reference image (RI). However, sighting of complex three-dimensional objects from small altitudes and at varying angles can lead to sharp gradients of radio brightness temperature within one object. This causes appearance of new boundaries between individual elements of the object itself, displacement, blurring or new contours on the current image of the sighting surface. These circumstances cause non-stationarity of the current picture formed in the CENS. Thus, a structural mismatch appears between current and reference images which necessitates the use of other auxiliary invariant attributes

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The subject of this research is determination of the loss of charged particles in the pre-ionized air medium of the openings of the screen housings of radio-electronic means (REM) and waveguide antenna inputs depending on the parameters of electromagnetic radiation (EMR). The aim of research is establishment of the dependence of the diffusion coefficients, sticking, electron temperature and recombination on the parameters of the electromagnetic radiation, which determine the loss of electrons during the formation of a highly conductive channel in the discharge gap. The need to determine the loss of charged particles when solving the problem of protecting the REM from the effects of powerful electromagnetic radiation based on the use of nature-friendly (plasma) technologies is due to the need to determine the time of formation of the high-conductive channel and the strength of the electromagnetic radiation at which the breakdown in the discharge gap will be carried out. The article solves the following tasks: analysis of known scientific results in the field of development and research of the interaction of ionized air with EMR; determination of the influence of the working signal on the diffusion and mobility of ions; determination of the influence of high-frequency (HF) and microwave (MW) electric field on diffusion, mobility, electron temperature of charged particles of a weakly ionized air medium in an orifice (antenna waveguide) to obtain an analytical expression for estimating the concentration of charged particles within the scattering angle  taking into account the effect on the state of the electronic subsystem powerful EMR; determination of the EMR effect on the recombination of charged particles during the formation of a highly conductive electron channel.The following results were obtained: It was found in the article that a powerful EMR has a significant effect on the diffusion and mobility of charged particles and, accordingly, on the formation of a highly conductive channel for shorting EMR in radioelectronic equipment protection devices (REPD), an expression for estimating the concentration of ions within an angle, which takes into account the loss of charged particles due to the processes of diffusion and mobility; The effect of recombination of charged particles at different values of atmospheric pressure and air temperature on the initial electron concentration in the discharge gap is determined, which, in turn, leads to an increase in the time of formation of a highly conductive channel and requires a higher amount of EMR energy, which may exceed the maximum allowable level. Conclusion shows that: the losses of charged particles in the pre-ionized air medium of the holes of the box-screens of radio-electronic means and waveguide antenna inputs are determined depending on the parameters of electromagnetic radiation.

The subject of the present research is a formalized descriptive model of the interaction between electromagnetic radiation (EMR) with ultrashort pulse duration (UPD) and weak ionized air, and forming of the high-conductivity state in the discharge gap. The aim of the paper is to work out a description of the interaction between EMR UPD and weak ionized air and forming of a high-conductivity state in the discharge gap.The objectives of the article can be stated as follows: to analyze the well-known scientific results in the sphere of developing and investigating the materials and media with the use of plasma technologies, and their interaction with EMR UPD, to analyze the process of the EMR UPD reflection from artificially created high-conductivity channels in the constructive holes and cable channels of the input of corps-screens; to develop a system of physical model for the constructive holes and cable channels' input protection, taking into account the hole air state's change under the influence of a radioisotope source, electromagnetic wave (EMW) and EMR UPD; to work out a formalized descriptive model of the interaction between EMR UPD and weak ionized air, and formation of a high-conductivity state in the discharge gap.The results of the research are as follows: in the article has been suggested the descriptive model of the interaction between EMR UPD and weak ionized air, and the formation of a high-conductivity state in the discharge gap. The novelty of the research lies in taking into account the physical processes on the initial plasma, plasma-living and plasma-stripped stages, which influence the change of the hole air's conductivity state, and are determined by the time and energetic conditions of high-conductivity channel's formation in the hole air of cops-screens, cable channels of the radio electronic means' (REM) input on the condition of interaction between EMR UPD and weak ionized air, depending on the intensity of a source of ionization, EMR parameters, and also the value of athmospheric pressure lead to the evolution of EMR impulse. Findings of the reseach: the suggested solution gives the opportunity to assert the emergence of a guaranteed highly conductive channel to carry out a circuit of RMR in a hole (gap) and the prevention of further penetration and distructive impact on REM.