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• EXPERIMENTAL FACILITY BASED ON ANECHOIC CHAMBER FOR ACTIVE RADIOSENSORY TECHNICAL DIAGNOSTICS

  А.Y. Zvyagin , К.А. Boikov

  201-211

  2025-10-01

  Abstract ▼

  The article presents the results of the development and experimental study of two designs of anechoic chambers designed for active radiosensory technical diagnostics (ARTD). The aim of the work was to create conditions for obtaining a reliable radio signal profile (SRP) of the object under study with minimal distortion due to the effective suppression of external electromagnetic interference and reflections. As part of the study, two configurations of shielded volumes were implemented: the first based on a multilayer foil reflective structure, the second using high-quality Faraday fabric. Comparative evaluation testing of the shielding efficiency was carried out at different states of the microwave element. The state of the microwave element was changed by changing the scheme of the microwave mixer, by soldering out key elements. To verify the functional characteristics, a series of measurements were performed by probing the surface of the microwave mixer under study with short pulses (SP). The resulting SRP was recorded using an oscilloscope and a receiving antenna. Pearson correlation analysis was used to process the results, which proved effective in quantifying the differences in the SRP of an object in good and defective conditions. The experimental data obtained made it possible to evaluate the quality and prospects of materials based on key parameters: the degree of suppression of parasitic signals, resistance to external interference in various operating conditions, mechanical durability under cyclic loads, and the economic feasibility of implementation, taking into account the cost of materials and the complexity of assembly. The results of the study demonstrate the practical applicability of both designs in precision radio measurement tasks, while the choice of a specific material is determined by an optimal compromise between production costs, performance characteristics in various climatic conditions and the required level of shielding for a specific application. The data obtained can be successfully used in the design of both stationary laboratory complexes and mobile ARTD systems in conditions of limited resources, including field measurements and industrial monitoring. Studies have shown the promise of both approaches to achieve maximum shielding characteristics over a wide frequency range

• EVALUATION OF THE SHIELDING COEFFICIENT BY CRITICAL SYSTEM FUSELAGE IN THE COMPOSITION OF THE AIRCRAFT

  V.P. Mozhaytsev, D.V. Semenikhina

  2021-02-13

  Abstract ▼

  This article discusses the problems of ensuring the flight safety of aircraft using electrical /
  electronic systems when exposed to high-intensity electromagnetic fields. A method is being developed
  for analyzing the impact of high-intensity radiated fields that create an electromagnetic environment
  in the aircraft location area, based on the main factors of the aircraft electromagnetic
  compatibility, such as the electromagnetic environment, the mechanism of communication or action,
  the sensitivity or susceptibility of electromagnetic radiation receivers with threshold values of
  interference in the frequency and time domains. Two methods for assessing the aircraft resistance
  to high-intensity electromagnetic fields are analyzed: high-level scan tests and low-level scan
  tests. The purpose of this article is to estimate the fuselage shielding coefficient in the places
  where critical systems units are installed using software for numerical electrodynamic modeling.
  The objective of the study is to create and calculate a mathematical model of the critical system as
  part of an aircraft. The article developed electrodynamic models of the critical system of the aircraft
  – a multifunctional liquid crystal indicator, and the calculation is carried out in the Ansys
  HFSS full-wave electrodynamic design package. Reasonable simplifications are made to the HFSS
  cockpit model for calculating the fuselage-shielding factor. Simplifying the model means eliminating
  small parts and objects that are much shorter than the wavelength and reducing the model's
  area of study, since the critical system blocks are located in the front of the cockpit. The estimation
  of the fuselage-shielding factor in the frequency range from 100 MHz to 1 GHz is carried out, the
  analysis and comparison of the results obtained with the tests in the aircraft are carried out. The
  results are of a similar nature, however, the calculated values of the shielding factor are 5–15 dB
  lower in the frequency range from 400 to 850 MHz. Also in the frequency range up to 400 MHz,
  there are characteristic resonant "dips" of the screening coefficient. The results obtained will
  make it possible to single out the most dangerous sources and zones of excitation of electromagnetic
  interference for subsequent detailed analysis, and to reduce the time and cost of testing.