Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
8
2019
RADIO MONITORING ANTENNA FOR DIRECTIONAL FINDING
651-662
10.1615/TelecomRadEng.v78.i8.10
L.Y.
Ilnitskyi
National Aviation University, 1 Kosmonavta Komarova Ave., Kyiv 03058, Ukraine
L. V.
Sibruk
National Aviation University, 1 Kosmonavta Komarova St., 03058, Kyiv,
Ukraine
I. I.
Mykhalchuk
National Aviation University, 1 Kosmonavta Komarova Ave., Kyiv 03058, Ukraine
antenna array
direction finding
suppression of the interference
The theoretical bases of the development of an antenna for monitoring system are presented. Antennas combine the functions of measuring the emissions parameters, directional finding and suppression of the interference waves, close by the frequency to the main radiation. Antenna system includes array 3x2, flat screen and mechanical rotator. Minimum angular separation between direction of a signal and direction on interference wave is obtained.
A HIGH GAIN DUAL BAND CIRCULARLY POLARIZED MAGNETO-ELECTRIC DIPOLE ANTENNA
663-670
10.1615/TelecomRadEng.v78.i8.20
Neetu
Department of Electronics and Communication, Manipal University Jaipur, Dehmi Kalan, Near GVK Toll Plaza, Jaipur-Ajmer Expressway, Jaipur, Rajasthan 303007, India
ME dipole
circular polarization
3-dB axial ratio
satellite communication
dual band
This paper provides possibilities to design a low profile, lightweight and mechanically robust Magneto-Electric dipole antenna for satellite communication. The antenna consists of horizontal T-shaped electric dipole, an inverted U-shaped feed line, a truncated ground plane and two directors to increase the gain. The antenna possesses wide impedance bandwidth of 90.9% in the frequency range, 1.5 GHz-4.0 GHz and provides circular polarization in dual bands. The 3-dB axial ratio bandwidth of 12.5% and 20.8% has been achieved in the frequency range 1.5 GHz-1.7 GHz and 3.0 GHz-3.7 GHz, respectively. The reported peak gain is 7.5 dBi with symmetrical E-plane and H-plane radiation pattern. To verify the ruggedness, the antenna has been mounted at two different positions over the car and good electrical and radiation characteristics have been observed, hence, making the antenna suitable for satellite communication.
STEGANALYSIS OF DIGITAL IMAGES UNDER DIFFERENT CONTENT FULLNESS
671-681
10.1615/TelecomRadEng.v78.i8.30
A. V.
Akhmametieva
Odessa National Polytechnic University, 1 Shevchenko Ave, Odessa 65044, Ukraine
M. C.
Bwabwa
Odessa National Polytechnic University, 1 Shevchenko Ave, Odessa 65044, Ukraine
steganalysis
digital image
sequential triads of triplets
spatial domain
losses format
lossless format
An improvement of the steganalytic method for detection of the presence of additional information in color digital images which showed high efficiency in identifying stegano formed by embedding of secret data only into one color component of the container is presented. The proposed method analyses digital image in the spatial domain and is based on the accounting of sequential color triads in the matrix of unique colors of the digital content. However, in the process of steganographic transformation cases of embedding of confidential data into two and three color components of images are possible that ensures the concealment of a larger amount of information and requires the improvement of the existing method of steganalysis. In the course of the conducted research the character of perturbations in the quantity of sequential triads of triplets in a matrix of unique colors as a result of embedding of additional information into two and three color components of images originally stored in a losses format was analyzed. Considering obtained results the parameters of the original method for detecting of stegano was refined. It has been established that the character of changes in the quantity of sequential triads of triplets as a result of steganographic transformation is different in cases of using containers in a losses format and containers in a lossless format. Based on the obtained data the steganalytic method has been improved by integrating it with the method of detection the fact of compression of digital content developed earlier. The developed method provides high efficiency in detecting stego formed with different degree of container fullness without reducing the accuracy of identifying the filled color components if the additional information was embedded into only one color component of the digital images. This method can be used as a basis for complex steganalysis of digital contents by using existing methods that analyzes color matrixes of images separately.
THE KUPYNA HASH FUNCTION CRYPTANALYSIS WITH THE MERKLE TREES SIGNATURE SCHEMES
683-689
10.1615/TelecomRadEng.v78.i8.40
O. G.
Kachko
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv 61166, Ukraine
D.
Televnyi
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv 61166, Ukraine
tree traversal problem
merkle tree schemes
kupyna
cryptanalisys
The paper is devoted to the security analysis of the Kupyna (DSTU 7564:2014) hash function applied to Merkle tree signature schemes. The paper lists possible attacks on the hash, and their application for signature schemes. The results show expediency of using the Kypuna hash in Merkel schemes based on the performance, security levels and strength against known cryptanalytic attacks.
LOW COST SDR RECEIVER IMPLEMENTATION USING RTL-SDR DONGLE
691-705
10.1615/TelecomRadEng.v78.i8.50
Reda
Yagoub
Smart Structures Laboratory (SSL), University Center Belhadj Bouchaib of Ain Témouchent, Po Box 284, Ain Témouchent 46000, Algeria
B.
Benadda
Abou Bekr Belkaid University of Tlemcen, PO BOX 119, Tlemcen 13000, Algeria
M.
Benaissa
Information Processing and Telecommunications Laboratory (LTIT), Faculty of
Technology, University of Bechar, Bechar, Algeria; Electrical Engineering Department, Abou Bekr Belkaid University of Tlemcen,
Tlemcen, Algeria
A.
Taleb-Ahmed
IEMN DOAE UMR CNRS 8520, Polytechnic University of Hauts-de-France, Valenciennes 59313, France
A.
Lahouel
Smart Structures Laboratory (SSL), University Center Belhadj Bouchaib of Ain Témouchent, Po Box 284, Ain Témouchent 46000, Algeria
F.
Zane
Smart Structures Laboratory (SSL), University Center Belhadj Bouchaib of Ain Témouchent, Po Box 284, Ain Témouchent 46000, Algeria
software defined radio
RTL-SDR dongle
spectrum analyzer
canning
monitoring
The advent of Software Defined Radio (SDR) has made it possible to replace large parts of classical radio communication equipment with digital and software components to easily achieve configurable and multiplatform communication systems. SDR provides many advantages for research and development. In this work, the low-cost Realtek Software Defined Radio (RTL-SDR) dongle can serve as a cheap SDR platform to receive and digitize exchanged RF signals. In case of RTL-SDR dongle, in-phase and quadrature samples (I/Q) are sent as a stream through simple Universal Serial Bus interface (USB) to host computer. This paper describes a SDR application that can be used for many functionalities such as monitoring and scanning of frequency bands with RTL-SDR dongle.
ACOUSTOMAGNETIC REGISTRATION OF MAGNETIC NANOPARTICLES IN A LIQUID MEDIUM
707-714
10.1615/TelecomRadEng.v78.i8.60
I. S.
Bondarenko
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv 61166, Ukraine
O. G.
Avrunin
Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
M. V.
Rakhimova
National University of Pharmacy, 53 Pushkinkaya St., Kharkiv 61027, Ukraine
S. I.
Bondarenko
B.Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauka Ave., Kharkiv 61103, Ukraine
A. V.
Krevsun
B.Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Nauka Ave., Kharkiv 61103, Ukraine
S. M.
Kulish
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
magnetic nanoparticles
ultrasound
direct magnetic field
biological substance
colloidal solution
The technique and results of experiments on the registration of magnetic nanoparticles in a colloidal solution using the combined effect of ultrasound and a direct magnetic field are presented. The possibility of using this technique to control the content of magnetic nanoparticles in a biological substance is discussed.
DEFECT FORMATION MECHANISMS OF ZINC SELENIDE LAYERS DOPED BY ISOVALENT IMPURITIES OF THE II GROUP
715-723
10.1615/TelecomRadEng.v78.i8.70
Victor P.
Makhniy
Yuri Fedkovych Chernivtsi National University, 2 Kotsyubynsky St., Chernivtsi, 58012, Ukraine
M. M.
Berezovskiy
Yu. Fedkovych Chernivtsy National University, 2 Kotsubynsky St, Chernivtsy, 58012, Ukraine
O. V.
Kinzerska
Yuri Fedkovych Chernivtsi National University, 2 Kotsyubynsky St., Chernivtsi, 58012, Ukraine
defect formation mechanisms
zinc selenide
isovalent impurity
intrinsic point defects
quasichemical reaction method
electronegativity
The paper discusses the mechanisms of defect formation in melt zinc selenide crystals doped with isovalent impurities of the second group of the Periodic Table. An analytical calculation of the concentrations of equilibrium point defects was carried out by the method of quasichemical reactions using the concepts of electronegativity and effective charge. It has been established that the dominant defects in the doped material are singly charged vacancies of zinc V'Zn and selenium V·Se, as well as singly charged interstitial selenium Se'i. It is shown that the increase in doping temperature Ta from 373 to 1237 K causes se increase of acceptor centers number (V'Zn and Se'i) and decrease of concentration of donor ounces V·Se however, the conductivity of doped substrates at 300 K remains a hole in the whole range of change Ta. At Ta = 373 K the estimated concentration of free holes is ~1019 cm-3 and satisfactorily consistent with the value p determined from the temperature dependence of the layer resistance ZnSe:Ca.
SOLID ACTIVE MEDIA FOR TUNABLE LASERS BASED ON DYE-DOPED POLYURETHANES
725-741
10.1615/TelecomRadEng.v78.i8.80
S. V.
Nickolaev
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
V. V.
Pozhar
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
M. I.
Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
K. S.
Nickolaev
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
solid-state dye laser
polyurethane active medium
This article is devoted to a brief review of the main results of the research cycle aimed at developing solid active media based on dye-activated polyurethane compounds. The ultimate goal of these studies is the creation of solid-state active elements that make it possible to realize a wide-band solid-state dye laser (SSDL), which emits frequency-tunable radiation with a microsecond pulse duration. The problem has been solved mainly by experimental methods. At the same time, the studies carried out included a full range of works from the production of samples of solid-state active media to the study of the lasing characteristics of the active elements created. In the course of the work, lasents based on industrial polyurethanes of various grades activated with the Rhodamin 6G, Sulforhodamine 101, Oxazin 17, and Oxazin 1 dye have been created, and their spectral-luminescent characteristics have been studied. The experimental samples of laser matrices are made. The optical properties of the created media are studied, and the influence of the technique of making samples on the nature of possible distortions of their optical homogeneity is determined. The emission ability of polyurethane matrices is studied. With transverse monochromatic excitation, laser emission on polyurethane matrices has been obtained with an efficiency of 12 to 26% and energies from 23 to 127 mJ. Radiation resistance and possible service life of polyurethane media are investigated. The thermo-optical properties of polyurethane active media and their effect on the directivity of SSDL radiation is studied. The effect of induced birefringence, which occurs under conditions of asymmetric pumping of microsecond duration, is observed. It is found that under such conditions, polyurethane active elements emit polarized radiation even when excited by depolarized light. The possibilities of narrowing and tuning the emission spectrum of polyurethane matrices in dispersive resonators with angular and amplitude types of selection have been investigated. The laboratory model of a tunable SSDL with replaceable polyurethane laser elements generating a pulsed radiation of a microsecond duration in the spectral range of 565...700 nm is created and tested. The results of the performed studies allow us to conclude that industrial polyurethane compounds can be successfully used as solid media for active elements of SSDL.