A method is proposed for determining the boundaries of the maximum largest zone of stable radio reception in the UHF/VHF range using beam antenna system under the action of several sources of radio interference located at different altitudes. The increase in the size of the stable radio reception area is ensured by the optimal orientation of the antenna arrangement at each point in azimuth and angular altitude using the radio communication channel model. To determine the coordinates of the map points belonging to the boundary, a modification of the wave algorithm is proposed. The conducted experimental studies for the Mototrbo TM DP4800 and Kenwood TK-8302 radio equipment allow concluding that the theoretical positions and computer simulation analysis results obtained are reliable.

A method for determining the limits of the maximum size of the stable radio reception area in the UHF / VHF range for mobile radio communication under the conditions of the radio interference system is proposed. The radio is intended to use a directional antenna or screen. Increasing the size of the stable radio reception area is provided by the optimal orientation at each point of the antenna device in azimuth and angle using the model of the radio channel, which allows to calculate the signal / interference ratio taking into account the spatial location of radio interference sources and digital 3D antenna pattern. receiver. The problem of determining the boundaries of the zone of stable radio exchange of mobile radio means using directional antennas in the conditions of real interference is formulated in the form of the problem of finding a single isoline in a scalar field. To determine the coordinates of the points of the map belonging to the isoline, a modification of the wave algorithm is proposed, which is low complexity and unambiguous results. Examples of practical use of the proposed numerical method allow us to conclude that the results are inconsistent with the data obtained in the known works by the analytical method for a particular case. At the same time, the numerical approach used significantly expands the possibilities of calculations by taking into account the location of multiple sources of radio interference at different altitudes, as well as the optimal orientation of the digital 3D - pattern of the antenna device of the signal receiver. The effectiveness of the proposed method is confirmed by increasing the area of the noise-tolerant radio exchange zone by 2.8 times in relation to the option of using a mobile radio with a dipole antenna. For the case of optimal orientation of the directional antenna of the receiver by the azimuth angle, additional optimization by the angle of the place gives a gain of 1.5 times.

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The article deals with the problem of determining the electromagnetic availability zone of the radio transmitter of the radio communication channel in the UHF/VHF range on the terrain map of the area. This problem was solved using well-known mathematical models of radio signal propagation, depending on the characteristics of the specific area. Based on the wave algorithm, a bounds calculation method of electromagnetic availability zone is proposed, using a digitized radiation pattern of radio means. The conducted calculations show the effectiveness of the method in the tasks of assessing the performance of a mobile radio communication channel and its security at local combat operations in the conditions of operation of an enemy radio reconnaissance receiver or a radio interference system.

The subject of research in the article is the methods of testing digital devices implemented on programmable logic devices (PLDs). The aim of the research is to substantiate the approach to diagnosing microprocessor systems based on PLD, which is a further development of the self-diagnostics method. The following tasks are solved in the article: the analysis of existing methods for testing digital devices is conducted, their advantages and disadvantages are disclosed; analyzed the existing approaches to the diagnosis of microprocessor systems, which are based on integrated circuits with a programmable structure; an approach to diagnosing microprocessor systems based on PLDs is proposed, which is based on the principle of interaction between processors by introducing a service processor into a multiprocessor system. The following results have been obtained: it has been proved that the implementation of the proposed models of interaction between processors in a multiprocessor system will provide the service processor with diagnostic information about the technical state of the system. It is noted that the availability of diagnostic information about the technical condition of the microprocessor system is the basis for making a decision to restore the system by reprogramming the PLD. Conclusions: the problem of diagnosing microprocessor systems in the PLD basis is considered. The analysis of existing methods for testing integrated circuits with a programmable structure has been conducted, their advantages and disadvantages have been noted. It is proposed to use the built-in service processor as a diagnostic device, the main function of which is to collect diagnostic information and make a decision on the reconfiguration of the microprocessor system in order to quickly restore its functioning automatically.