Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
70
10
2011
PROJECTION APPROXIMATIONS TO THE MATRIX SCATTERING OPERATORS AND RELATIVE CONVERGENCE PHENOMENON
843-856
10.1615/TelecomRadEng.v70.i10.10
I. V.
Petrusenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; University of Customs Affair and Finances, 8, Rogaleva St., Dnepropetrovsk 49000, Ukraine
Yuriy
Sirenko
IRE NAN Ukraine
mode-matching technique
truncation procedure
Cayley transform
A matrix-operator model of the mode-matching technique is examined for a scalar problem of mode diffraction on abrupt discontinuity in the waveguide. The convergence of approximations, which are found via a truncation procedure, to the matrix operators of mode reflection and transmission is studied analytically. Various estimates for these projection approximations are obtained. On the basis of these results, the unconditional and relative convergence phenomena are analyzed. The impact of the "Mittra rule" upon the rate of convergence is validated analytically. The uniform-convergence condition for scattering operator approximations is stated. Properties of the condition number for the truncated matrix-operator equation are discussed. The results thus obtained may well be used to substantiate a highly practically class of mathematical models related to the mode-matching technique.
ON THE INVESTIGATIONS OF LONG-DISTANCE TROPOSPHERIC PROPAGATION IN UKRAINE
857-871
10.1615/TelecomRadEng.v70.i10.20
Ya. S.
Shifrin
Kharkov National University of Radio Engineering and Electronics, Ukraine
long-distance tropospheric propagation
gain reduction
instantaneous radiation patterns
In the article, main results of the experimental investigations of the phenomenon of long-distance tropospheric propagation of short waves, carried out at the Govorov Artillery Radio Technical Academy in 1956-1962, are briefly given.
ANALYSIS OF PULSED FIELDS REFLECTED FROM A LAYERED LOSSY MEDIUM USING ARTIFICIAL NEURAL NETWORK
873-881
10.1615/TelecomRadEng.v70.i10.30
D. V.
Shirokorad
Zaporozhye National Technical University
Oleksandr
Dumin
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
O. A.
Dumina
Ukrainian State Academy of Railway Transport
V. A.
Katrich
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022,
Ukraine
time domain
artificial neural network
layered medium
A solution is found to the problem in determining the thickness of a layered medium through the use of the pulsed e.m. field. The artificial neural network (ANN) is used in the time domain to treat analytically the pulsed field reflected from a layered medium whose electric characteristics are close to those of human shin. The normal incidence of a time-shaped plane wave in the Gaussian form of is discussed. The reflected e.m. field is calculated by the finite-difference time-domain (FDTD) method. Use is made of the amplitude value of a reflected-field electric component. As an example, the network is trained to determine the thickness of one of the layers. The consistency of such determination is examined in the presence of interferences, experimental errors and slight deviations of the medium's electric parameters.
NOISE RADAR WITH SYNTHESIZING A SPECTRUM OF SOUNDING SIGNAL
883-898
10.1615/TelecomRadEng.v70.i10.40
K. A.
Lukin
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
Anatoly
Mogyla
O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
V. P.
Palamarchuk
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
A. V.
Kravchuk
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
B. S.
Cherniy
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
noise radar
noise sounding signal
frequency modulation
hopping frequency
synthesized spectrum
The results of development and experimental research of L band noise radar with the synthesized spectrum of sounding signal are presented. Behavior of a synthesized noise signal phase has been studied in case of stepped frequency. Besides, we have investigated the basic radar performance such as, spectral characteristics of probing signal, its central frequency switching time, output signal of quadrature detector, range profile, etc. Possibility of range limitation is experimentally shown in the required observation area jointly with selection and measuring of the target distance within this area when using sounding noise signals with the synthesized spectrum.
THE BLACK SEA BREEZES AS SEEN WITH SODAR AND RASS
899-915
10.1615/TelecomRadEng.v70.i10.50
Nina
Maksymova
Kharkov National University of Radio Electronics
remote sensing
atmosphere boundary layer
sea breeze
sodar
radioacoustic sounding system
The results of the experimental investigations in the atmosphere boundary layer space-time structure over the Black sea northwestern coast under action of sea and coastal breezes, carried out with the complex incorporating sodar and RASS, are given.
RADIO MONITORING OF BROADBAND SIGNALS WITH PSEUDORANDOM TUNING OF THE OPERATING FREQUENCY
917-930
10.1615/TelecomRadEng.v70.i10.60
P. A.
Dyatlov
South Federal University, Technological Institute, Taganrog, Russian Federation
A. P.
Dyatlov
South Federal University, Technological Institute, Taganrog, Russian Federation
broadband signal
radio monitoring
frequency-and-time matrix
multichannel energy detector
rapid-response analyzer
pseudorandom tuning
Principles of construction of a rapid broadband signal analyzer with pseudorandom tuning of the operating frequency are investigated.
A METHODOLOGICAL APPROACH TO DETERMINATION OF THE REQUIRED ACCURACY OF MEASUREMENT OF TECHNICAL INFORMATION LEAKAGE CHANNEL PARAMETERS FOR MONITORING INFORMATION PROTECTION EFFICIENCY
931-935
10.1615/TelecomRadEng.v70.i10.70
O. I.
Nesterovskii
State Research and Test Institute of Information Technical Protection Problems, Federal Service on Technical and Export Control, Voronezh, Russian Federation
leakage channel
information protection
monitoring method
unauthorized access
signal/noise ratio
observation modeling
An approach to determination of the required accuracy of measurement of technical information leakage channel parameters for solving the problem of monitoring information protection efficiency based on the specified solution authenticity is described.