Recognition of radio signals based on the approximation of the spectral function in the basis of transfer functions of second-order resonant links

DOI: 10.31673/2409-7292.2024.020002

  • Дробик О. В. (Drobyk O. V.) State University of Information and Communication Technologies, Kyiv
  • Лаптєв О. А. (Laptiev O. A.) Taras Shevchenko National University of Kyiv, Kyiv
  • Пархоменко І. І. (Parkhomenko I. I.) Taras Shevchenko National University of Kyiv, Kyiv
  • Богуславська О. В. (Boguslavska O. V.) Taras Shevchenko National University of Kyiv, Kyiv
  • Пепа Ю. В. (Pepa Yu. V.) State University of Information and Communication Technologies, Kyiv
  • Пономаренко В. В. (Ponomarenko V. V.) State University of Information and Communication Technologies, Kyiv

Abstract

The article proposes a new method of detecting the signals of means of secretly obtaining information, which use a radio channel to transmit intercepted information. The novelty of the method consists in the combination of two methods, the method of differential transformations and the method of approximation of the spectral function in the basis of the transfer functions of the secondorder resonant links. It is possible to approximate the signals of means of tacitly obtaining information by differential Taylor transformations. Unlike the well-known integral Laplace and Fourier transforms, the image is found using differentiation operations, not integration. We use this method directly to solve systems of nonlinear equations without their prior linearization. To obtain parameters of signal detection, the method of approximation of the spectral function is used based on the transfer functions of secondorder resonant units. In order to detect the parameters of the signals of the means of covertly obtaining information, it is proposed to use the method of differential transformations at the first stage, in order to obtain the spectrum of the signals. And at the second stage, in order to obtain component signals, use the method of approximation of the spectral function based on the transfer functions of the second-order resonant units. The main advantage of the proposed method is that it can be applied directly to solving systems of nonlinear equations without their prior linearization, which allows obtaining solutions in an analytical form. This approach makes it possible to significantly reduce the amount of computing work and shortens the time for searching for signals of means of obtaining information secretly. In order to confirm the proposed method, modeling of the exponential function was carried out. Received graphic materials. The graphic materials fully confirm the reliability of the proposed method.

Keywords: means of illegal obtaining of information, approximation, method, spectrum, radio signal, modeling, formant.

Issue
No 2 (2024)
Section
Articles