Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
71
5
2012
INFLUENCE PRODUCED BY THE MULTIPATH PROPAGATION OF RADIO WAVES ON ACCURACY OF MEASUREMENT OF THE ANGLE OF ELEVATION OF THE LOW-LEVEL RADIATOR USING A ROOT-MUSIC ALGORITHM
387-401
10.1615/TelecomRadEng.v71.i5.10
V. B.
Razskazovsky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
Yu. F.
Logvinov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
Yu. A.
Pedenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine,12 Academician Proskura St., Kharkov 61085, Ukraine
radio microwaves
multipath propagation
elevation angle measurement
spectral estimation
MUSIC
The influence produced by the multipath propagation of radio microwaves over the sea on accuracy of determination of the elevation angle of a radiation source using the spectral estimation root-MUSIC algorithm has been determined. A received signal was modeled using a recently developed method for the calculation of field over the rough surface at strong shading; this method can be applied even for zero sliding angles. Measurement errors of the elevation angle obtained using the root-MUSIC method, were compared with those obtained using the monopulse and off-axis methods for the angle measurement. The advantages of the root-MUSIC method used for the measurement of elevation angles equal to tenth fractions of the beam width of a direction-finding antenna have been described.
ON RELATIONSHIP BETWEEN EVAPORATION DUCT HEIGHT AND MICROWAVE ATTENUATION IN OVER-THE-HORIZON AREA
403-412
10.1615/TelecomRadEng.v71.i5.20
Yurii V.
Levadnyi
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
V. K.
Ivanov
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
V. N.
Shalyapin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
atmospheric duct
radio wave propagation
numerical methods
The analysis of the experimental data is carried out to find out the relationship between evaporation duct height defined on the basis of bulk meteorological measurements and attenuation of centimeter waves in over-the-horizon range. It is demonstrated that evaporation duct height reduction to three meters for small heights of evaporation ducts, to two meters for medium height and one meter for large-height ones increase accuracy of microwave propagation diagnostics. It is also confirmed that in tropical and subtropical areas of the Atlantic Ocean for low antenna heights an evaporation duct is one of the major propagation mechanisms for three-centimeter waves.
ELECTROMAGNETIC WAVE SCATTERING BY A CURVED SCREEN OF FINITE THICKNESS
413-422
10.1615/TelecomRadEng.v71.i5.30
I. O.
Sukharevsky
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085
S. V.
Nechitaylo
Ivan Kozhedub Kharkiv National University of Air Force, 77/79 Sumska St., 61023 Kharkiv, Ukraine
D. D.
Ivanchenko
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077, Ukraine
P. N.
Melezhik
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
electromagnetic wave scattering
integral equation
perfectly conducting curved screen of finite thickness
radar cross section
We propose a method for numerical solution of electromagnetic scattering by curved screens of finite thickness, based on solving the integral equation of electric field. The numerical results presented concern the scattering by a spherical screen and a screen, which is not a surface of revolution. Characteristics of scattering by a spherical screen are compared with experimental data.
USE OF MICROSTRUCTURE PARAMETERS FOR DATA PROCESSING OF DOUBLE FREQUENCY MEASUREMENT OF RAIN INTENSITY
423-433
10.1615/TelecomRadEng.v71.i5.40
A. M.
Linkova
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
radar cross-section
diffraction
differential reflectivity
rain intensity
Results of study of double frequency method for measurement of rain intensity using three-parameter gamma distribution of drop sizes are presented. For elimination of measurement ambiguity of distribution parameters using data of double frequency sounding the use of data of contact measurement of connection between rain intensity and gamma distribution parameters was proposed. The results of calculations performed by the Mie theory were presented. They allow to estimate applicability of proposed method for polydisperse medium and to give recommendations for choice of frequency range for double frequency radar.
USE OF SPECTRAL IMAGES FOR SIGNAL ANALYSIS
435-443
10.1615/TelecomRadEng.v71.i5.50
Ivan S.
Zakharov
Kursk State Technical University, Kursk, Russian Federation
A. F.
Rybochkin
Kursk State Technical University, Kursk, Russian Federation
S. V.
Pravednikova
Kursk State Technical University, Kursk, Russian Federation
acoustic signal
spectral image
coding
spectral analysis
Analysis of an acoustic signal by a relative comparison of different intensive components, obtained from narrow-band frequency filters, is presented. Intensive signal components from n narrow-band frequency filters are detected and then associatively compared in a unit of comparators. Cn2 binary codes, reflecting spectral images (shapes) or n! rearrangements, are generated at this unit outputs. The method can be used for compression of multidigit binary codes into two-digit symbols, correspondent to rearrangements being spectral image analogues, which can be easily transformed back to binary codes. The possibility of building relatively cheap diagnosis systems for recognition of the diagnosed object state is considered. A program that calculates spectral image levels from the obtained code messages and identifies codes for a given number of spectral image levels is developed.
ASSESSMENT OF THE SIGNAL/NOISE RATIO IN A BINARY SIGNAL
445-453
10.1615/TelecomRadEng.v71.i5.60
M. D.
Rasnikov
Yaroslavl P. G. Demidov State University, Yaroslavl, Russian Federation
I. T.
Rozhkov
Yaroslavl P. G. Demidov State University, Yaroslavl, Russian Federation
signal/noise ratio
quality assessment
nonlinear elements with tracking thresholds
Fibonacci transformation
calibration curves
The signal/noise ratio in a binary signal at the input of the receiver's decision device using sequential transformations in the nonlinear element and by Fibonacci transformation is assessed. Calculations of the basic system parameters and justification of selection of specific characteristics and units are provided.
IMPROVING AN ALGORITHM FOR DETECTION OF URGENT THREATS TO SECURITY OF PERSONAL DATA WHEN THEY ARE PROCESSED IN INFORMATION SYSTEMS OF PERSONAL DATA
455-463
10.1615/TelecomRadEng.v71.i5.70
Yu. K.
Yazov
State Scientific-Research Testing Institute of Problems of Technical Protection of Information, Federal Service on Technical and Export Control, Voronezh, Russian Federation
I. G.
Nazarov
Federal Service on Technical and Export Control, Moscow, Russian Federation
E. S.
Ostroukhova
State Scientific-Research Testing Institute of Problems of Technical Protection of Information, Federal Service on Technical and Export Control, Voronezh, Russian Federation
personal data (PD)
information system
urgent threats to PD security
algorithm for detection of urgent threats
The rules of determination and the relations for quantitative assessment of urgent threats to personal data security when these data are processed in information systems of personal data on the basis of determination of threat appearance and attack probabilities, as well as of hazard factors of destructive effects, using the theory of fuzzy set rules and scales for conversion of verbal assessments to quantitative assessments are presented.
EMISSION FEATURES OF SOLID-STATE DYE LASERS AT A TRANSVERSE METHOD OF EXCITATION
465-479
10.1615/TelecomRadEng.v71.i5.80
S. V.
Nikolaev
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
solid-state dye laser
polyurethane matrix
transverse pumping
The special features of the formation of emission characteristics of solid-state dye lasers with the transverse pumping are studied. The dependences of energy, spectrum and directivity of the emission from cylindrical polyurethane laser matrices on energy and degree of the exciting beam focusing are experimentally investigated. It is shown that the non-homogeneity of the pumping intensity distribution in the excitable matrix volume, which appears at a transverse mode of excitation, renders significant influence on the energy, directivity and spectrum of laser radiation.
GRAPHICAL MODELING OF THz GAS-DISCHARGE LASER RADIATION PULSE SHAPE
481-486
10.1615/TelecomRadEng.v71.i5.90
V. K.
Kiseliov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; V.N.Karazin Kharkiv National University 4, Svobody sq., 61022, Kharkiv, Ukraine
V. P.
Radionov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine
terahertz gas-discharge laser
pumping by alternating current
pulse shape
A technique for graphical modeling the pulse-shape of the radiation of the pulse-pumped THz gas-discharge laser is presented. The initial data to be used for modeling are as follows: the size and the shape of a discharge-current pulse; discharge current-dependent radiated power; the dependence of radiated power upon the tuning control of a resonator at different pumping currents. The application of the above technique makes it possible to produce pulses of required shape and to select laser peak-efficiency operating conditions.