Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
77
9
2018
PERFORMANCE ANALYSIS OF NARROW BAND FILTER CIRCUITS FOR THE CW DOPPLER RADARS SIGNALS
747-756
10.1615/TelecomRadEng.v77.i9.10
I. V.
Baryshev
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St., Kharkiv 61070, Ukraine
K. A.
Scherbina
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St., Kharkiv 61070, Ukraine
E. P.
Msallam
N. Zhukovskiy National Aerospace University (Kharkov Aviation Institute),
17 Chkalov St., Kharkiv, 61070, Ukraine
М. А.
Vonsovich
N. Zhukovskiy National Aerospace University (Kharkov Aviation Institute),
17 Chkalov St., Kharkiv, 61070, Ukraine
A. V.
Odokienko
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St., Kharkiv 61070, Ukraine
phase-located loop
frequency loced loop
filtering performance
target tracking
The comparative analysis of quantitative assessment of filtering by six performance indices of filter circuits of the continuous wave Doppler signal of 1-st order PLL, second order PLL, FLL with narrow-band filter circuit quadrature FM-detector based on synchronized oscillator with forced frequency tuning is carried out. The total overage performance indices of the circuit with SG exceeded any of the compared indices by 1.5 times, with a tenfold increase in separate parameters. At the same time the method of indices calculation of filter circuits with SG is developed and sample calculation formulas are obtained.
APPLICATION OF THE MATRIX PENCIL METHOD FOR RADAR MEASUREMENTS OF ELEVATION ANGLES OF LOW-ALTITUDE TARGETS OVER A DISTURBED SEA
757-768
10.1615/TelecomRadEng.v77.i9.20
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
Matrix Pencil method
low-altitude target
elevation angle
measurement accuracy
diffuse reflection
specular reflection
computer simulation
The study is focused on the problem of improving the accuracy of radar measurements of elevation angles of low-altitude targets over a sea. The Matrix Pencil method, which relates to the high spectral resolution techniques, is investigated in the paper as one of the possible instruments for solving the problem. A number of studies analyze the possibility of applying the method for measuring radio wave angles of arrival. However, the extent of its usefulness for
solving the problem of interest requires to be analyzed with account of specific conditions under which elevation angles of low-altitude targets are measured. The study was carried out by means of computer simulations. The analysis covered sea states responsible for the specular as well as for high diffuse reflections. One of the main tasks of the present paper was determining the extreme measurement accuracy achievable by the method on the conditions where the
diffuse reflection from the sea is considered as interference (the specular reflected signal along with the direct signal from the target is considered as the measured signal). It is shown that the Matrix Pencil method does not yield to the MUSIC method in this characteristic but even surpasses it, especially in the case of high diffuse reflections, when the improvement riches 20%. Another important task was investigation of the influence of a priori parameters of the method, specifically, the number of the measured signals, value of the so-called pencil-
parameter and number of the spatial samples of the signal across the specified antenna aperture, on the measurement error. Recommendations have been developed on the selection of these parameters that make it possible to minimize elevation angle measurement errors. The performed investigation expands our understanding about the ways of improving the accuracy of measuring elevation angles of low-altitude targets over a disturbed sea.
DENOISING OF MULTICHANNEL IMAGES WITH NONLINEAR TRANSFORMATION OF REFERENCE IMAGE
769-786
10.1615/TelecomRadEng.v77.i9.30
S. K.
Abramov
Department of Transmitters, Receivers and Signal Processing, National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
V. V.
Abramova
National Aerospace University (Kharkiv Aviation Institute), 17, Chkalov St., Kharkiv, 61070, Ukraine
V. V.
Lukin
National Aerospace University (Kharkiv Aviation Institute), 17 Chkalov St.,
Kharkiv, 61070, Ukraine
Karen O.
Egiazarian
Tampere University, Department of Signal Processing, P. O. Box 553, FIN-33101, Tampere, Finland
3D processing
reference
image denoising
multichannel images
quality metrics
It has been demonstrated recently that efficiency of filtering a noisy component image of a multichannel image can be sufficiently improved under condition that the multichannel image has almost noise-free component image(s) that possess high correlated with the noisy component image used as reference. High correlation and practical absence of the noise are only pre-requisites for efficient filtering of the noisy image using reference. Other criteria of similarity than cross-correlation factor are important. In this paper we show how it is possible to make the reference image very "close" to the noisy one by exploiting nonlinear transformation. Moreover, it is demonstrated that the proposed approach can be useful for denoising images corrupted by signal-dependent noise which is often the case for multichannel remote sensing data.
IMAGE CLASSIFICATION METHODS IN THE SPACE OF DESCRIPTIONS IN THE FORM OF A SET OF THE KEY POINT DESCRIPTORS
787-797
10.1615/TelecomRadEng.v77.i9.40
computer vision
image database
key point
descriptor
key point detector
class centers
training
Kohonen neural network
similarity measure
relevance
effectiveness of classification
There are discussed the issues of development of the classification rules in the structural methods of image recognition in the case that descriptions of the objects are represented as the sets of the key point descriptors. It is suggested the classification technology based on the direct formation of the class centers for the visual objects in the space of the values of descriptors. At creation of the centers there are applied the binary data analysis and training using the Kohonen neural network based on the set of descriptors from the application image database. There are provided the computer experiment results confirming effectiveness of the suggested methods of visual object classification.
ANALYSIS OF ASYMMETRIC NTRU PRIME IIT UKRAINE ENCRYPTION ALGORITHM WITH REGARDS TO KNOWN ATTACKS
799-816
10.1615/TelecomRadEng.v77.i9.50
I. D.
Gorbenko
V. Karazin National University of Kharkiv, 4 Svoboda Sq., Kharkiv, 61022,
Ukraine; Kharkiv National University of Radio Electronics, 14, Nauka Ave., Kharkiv,
61166, Ukraine
O. G.
Kachko
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv 61166, Ukraine
M. V.
Yesina
V. Karazin National University of Kharkiv, 4 Svoboda Sq., Kharkiv 61022, Ukraine
attack
ring
asymmetric encryption
factor ring
Modern cryptographic transformations of the asymmetric encryption type, namely – NTRU-like cryptosystems are considered. A new cryptographic system NTRU PRIME IIT UKRAINE was created based on existing cryptographic transformations of this type. A brief description of this cryptosystem is presented and an analysis of its resistance to known attacks is carried out, conclusions are made and recommendations are given.
ESTIMATION OF THE EFFICIENCY OF APPLICATION OF BAND SCRAMBLERS FOR VOICE INFORMATION PROTECTION IN THE NARROWBAND TELECOMMUNICATION SYSTEMS
817-830
10.1615/TelecomRadEng.v77.i9.60
V. D.
Kukush
Kharkiv National University of Radio Engineering and Electronics, 14 Nauka
Ave, Kharkiv, 61166, Ukraine
D. Yu.
Verchik
Kharkiv National University of Radio Electronics, 14, Nauka Ave., Kharkiv, 61166, Ukraine
telecommunications
voice information scrambler
fast Fourier transform
digital filter
The advantages of using scramblers in the narrow-band voice communication systems are considered and a detailed analysis of strength to hacking of communication channels secured by frequency-domain scrambling technique is given. The effect of the number and order of permutation of the bands on the residual legibility of the scrambled signal is investigated. A description is also given of the developed algorithm for digital signal processing, which realizes the function of the band scrambler in the frequency domain and does not require synchronization between the scrambler and the descrambler.
PULSE LOGARITHMIC AMPLIFIER WITH AUTOMATIC GAIN CONTROL FOR THE FREQUENCY RANGE FROM 1 MHZ TO 8 GHZ
831-838
10.1615/TelecomRadEng.v77.i9.70
I. M.
Mytsenko
O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
D. D.
Khalameyda
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
pulse logarithmic amplifier
automatic gain control
transistor
circuit
Today, the problem of overloading of pulse radar receivers by target return signals is of especially importance because of appearance of new kinds of radio systems of various applications. To prevent the overload, a number of techniques is used, including automatic gain control in dependence on the input signal level, separation of the dynamic range into subranges and multichannel amplification, application of amplifiers with logarithmic amplitude characteristic, etc. Good results are provided by combining a logarithmic amplification with automatic gain control of the signal level. In the paper, a pulse logarithmic amplifier with a
time-transit control of the signal gain control operating in the frequency range 1 to 8 GHz is described and its functional diagram and circuit schematic are presented. A compact-size experimental mockup of the device has been developed with the use of the modern circuitry which extends essentially its application capabilities. The physical principles of selecting the necessary bandwidth, not producing distortions in the radio pulse spectra and dynamic operation mode of the time-transit automatic gain control, are considered. Experimentally obtained amplitude curves are presented. The mockup parameters are as follows: the gain factor K0 within the linear range is ~53 dB; dynamic range of the input signals makes ~55 dB; the input and output resistances are Rin ≈ Rout = 50 Ω; and supply voltages are ±12 V (current consumption 100 mA) and ±5 V (current consumption 20 mA)