Olga Shcherbyna

Work place: Department of Electronics, Robotics and Monitoring and IoT Technologies, National Aviation University, Kyiv, Ukraine

E-mail: shcherbyna_ol@nau.edu.ua

Website: https://orcid.org/0000-0002-6058-2749

Research Interests: Microwave Technology

Biography

Dr. Olga Shcherbyna is an associate professor at the National Aviation University. Her qualifications are as mentioned Ph.D. (Radio Engineering & Television Systems), M.Tech. (Radio Engineering), B.Tech. (Radio Engineering). She has 15 years of teaching experience and her areas of interest include Antenna Systems, Microwave Devices, Electromagnetic Compatibility. A total number of research publications is 73.

Author Articles
Shadow Image Processing of X-Ray Screening System for Aviation Security

By Maksym Zaliskyi Olga Shcherbyna Lidiia Tereshchenko Alina Osipchuk Olena Zharova

DOI: https://doi.org/10.5815/ijigsp.2022.06.03, Pub. Date: 8 Dec. 2022

The aviation security is an important component of aviation safety providing. One of the main goals of aviation security service is to detect dangerous and prohibited objects during passengers and baggage screening. For this purpose, aviation security personnel use various equipment: X-ray screening system, body-scans, metal detectors, moving ions detectors, explosive trace detectors. The X-ray screening system gives information on internal structure of baggage. The main disadvantage of X-ray screening system is rather high level of the false alarm probability. This requires developing new methods of image processing and recognition of dangerous and prohibited objects on the background of other objects. This article develops the principles of shadow image processing while screening the baggage using X-ray system to fix the mentioned disadvantage. The math equation for shadow image is obtained based on the laws of geometry and Beer-Lambert equation taking into account the chosen scanning technique. Based on this, the article is focused to the analysis of simple objects images and their application for complex objects recognition. The article discusses the example of handgun recognition using a new approach based on spectral analysis of developed shadow images. The results of the research can be used for improvement of algorithmic toolkit in aviation security automatic decision-making system while screening the baggage by X-ray equipment.

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Comparison of Circular and Linear Orthogonal Polarization Bases in Electromagnetic Field Parameters Measurement

By Ludvig Ilnitsky Olga Shcherbyna Felix Yanovsky Maksym Zaliskyi Oleksii Holubnychyi Olga Ivanets

DOI: https://doi.org/10.5815/ijigsp.2022.03.06, Pub. Date: 8 Jun. 2022

This article considers the peculiarities of using circular orthogonal polarization basis for measuring the parameters of an electromagnetic wave. In particular, the angle of inclination of the major axis of the polarization ellipse and the ellipticity coefficient are among measuring parameters. The main expressions for calculation of field parameters in circular and linear orthogonal polarization basis are developed and analyzed. The advantages of using the ring as a measuring antenna in comparison with symmetrical vibrators of the turnstile antenna are substantiated. The expressions obtained in the article for calculating the measurement errors of polarization parameters in a linear orthogonal polarization basis illustrate the multifactorial dependence of the measurement accuracy on the angular and amplitude parameters. In contrast to the linear polarization basis, in case of circular basis, the inclination angle of the polarization ellipse axis can be found by direct measurements of the phase shift, and the accuracy of measuring the ellipticity coefficient is affected only by the error of measuring the ratio of voltage amplitudes, which are proportional to the modules of the field strength vectors of the left and right directions of the circular polarization rotation. This provides better potential accuracy of measurement for the electromagnetic wave parameters when using circular polarization antennas and, correspondingly, more reasonable analysis in the circular orthogonal polarization basis.

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Prospect for Using Low-Element Adaptive Antenna Systems for Radio Monitoring Stations

By Olga Shcherbyna Maksym Zaliskyi Olena Kozhokhina Felix Yanovsky

DOI: https://doi.org/10.5815/ijcnis.2021.05.01, Pub. Date: 8 Oct. 2021

This article is devoted to the analysis of prospect to apply multifunctional adaptive antenna systems for radio monitoring stations. The review of publications done demonstrates that current antennas that are developed and used in radio monitoring systems to control and measure the parameters of electromagnetic radiation should be applicable to conduct accurate measurements in wide frequency range under the condition of interferences. The analysis shows that modern adaptive antenna systems are mostly developed for radar and telecommunications applications. In this context we consider possible ways to solve the problem of adapting radio monitoring devices to a complex electromagnetic environment using antenna systems with primary processing of received signals . It was found that the developers of the antennas, which are based on adaptive interference suppression methods, focus basically on the development and implementation of adaptation processes, limiting themselves only to solving electromagnetic compatibility problems. In such approach, the functions of direction finding and measurement of radiation field parameters important exactly for radio monitoring systems are mostly ignored. Therefore, this research area opens up a wide field for identifying new possibilities for constructing multifunctional antenna systems. Focusing on this direction of research, we consider as an example the constraction of a simple two-element adaptive antenna system, which can be used to measure the parameters of the electromagnetic field in radio monitoring systems. The main relations for the error of determining the direction of arrival of the interference signal with a simple two-element antenna are investigated. The influence of the stability of the antenna array parameters and functional units of signal processing onto the errors is estimated.

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