Перегляд за автором "Kaliuzhnyi, M."

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  • Зображення мініатюри
    Публікація
    Consideration of Antenna Pattern by Elevation in Recommendation ITU-R P. 2001
    (IEEE, 2020) Chernov, A.; Kovshar, V.; Kaliuzhnyi, M.; Zheng Yu
    The question of the practical application of the comprehensive universal Recommendation ITU-R P.2001 in calculating the electromagnetic compatibility of electronic systems is considered. In this Recommendation antenna patterns are assumed isotropic in elevation plane. It is shown that to increase an accuracy of calculations by this technique, it is necessary to take into account the difference between the terminal antennas pattern and isotropic antennas. A detailed analysis of the propagation of radio waves sub-model for reflection from the sporadic layer E. The significant influence of the distance between the terminals and the types of their antennas on the calculation results for this sub-model. The quantitative corrections for typical short-wave and ultra-short wave antennas are determined. The directions of further research were selected to increase the accuracy of calculations of the propagation of radio waves when using the Recommendation ITU-R P.2001.
  • Немає доступних мініатюр
    Публікація
    Evaluation of the Efficiency of Recognition Radio Emitting Objects in Conjunction Signs Radar and Communication by Method of Statistical Tests
    (IEEE, 2020) Bezruk, V.; Khriapkin, O.; Kaliuzhnyi, M.; Qiang, G.; Nikolaev, I.
    In the report questions of assessment of efficiency of recognition of radio-emitting objects with use of set of signal signs both the systems of radiolocation, and communication systems and controls are considered. Results of experimental studies on the basis of these objects taking into account parameters of onboard radars and communication systems are provided.
  • Зображення мініатюри
    Публікація
    Generalizing the sampling theorem for a frequency-time domain to sample signals under the conditions of a priori uncertainty
    (Eastern-European Journal of Enterprise Technologies, 2021) Kaliuzhnyi, M.
    The radio monitoring of radiation and interference with electronic means is characterized by the issue related to the structural-parametric a priori uncertainty about the type and parameters of the ensemble of signals by radio-emitting sources. Given this, it is a relevant task to devise a technique for the mathematical notation of signals in order to implement their processing, overcoming their a priori uncertainty in terms of form and parameters. A given problem has been solved by the method of generalization and proof for the finite signals of the Whittaker-Kotelnikov-Shannon sampling theorem (WKS) in the frequency-time domain. The result of proving it is a new discrete frequency-temporal description of an arbitrary finite signal in the form of expansion into a double series on the orthogonal functions such as sinx/x, or rectangular Woodward strobe functions, with an explicit form of the phase-frequency-temporal modulation function. The properties of the sampling theorem in the frequency-time domain have been substantiated. These properties establish that the basis of the frequency-time representation is orthogonal, the accuracy of approximation by the basic functions sinx/x and rectangular Woodward strobe functions are the same, and correspond to the accuracy of the UCS theorem approximation, while the number of reference points of an arbitrary, limited in the width of the spectrum and duration, signal, now taken by frequency and time, is determined by the signal base. The devised description of signals in the frequency-time domain has been experimentally investigated using the detection-recovery of continuous, simple pulse, and linear-frequency-modulated (LFM) radio signals. The constructive nature of the resulting description has been confirmed, which is important and useful when devising methods, procedures, and algorithms for processing signals under the conditions of structural-parametric a priori uncertainty.
  • Немає доступних мініатюр
    Публікація
    The Computer Modeling of Aircraft Recognition by the Onboard Radiating Signal Features Based on the Similarity Indices Calculation Algorithm
    (IEEE, 2020) Kaliuzhnyi, M.; Kolisnyk, V.; Khriapkin, O.; Nikolayev, I.
    This paper consists of a methodical approach to solve the problem of aircraft recognition by the radiation features of airborne radar stations and radio communications based on the application of the similarity indices calculation algorithm. The results of the efficiency estimation by the similarity Indices calculation algorithm for the radiation objects recognition with different signal features combinations are presented. Computer simulation and statistical modeling are carried out and some results are given here. The paper says the similarity indices calculation algorithm can provide a high recognition probability a lot of radiation aircraft classes with the optimal rule for calculating objects similarity in a selected space of signal features.