Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
78
3
2019
WAYS OF EXTRACTION OF MAXIMUM INFORMATION FROM IMAGES OF ASTRONOMICAL OBJECTS
191-210
10.1615/TelecomRadEng.v78.i3.10
Y. V.
Kornienko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
Sergey I.
Skuratovskiy
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
astronomical images
statistical approach
phase accumulation
surface relief
photoclimonetry
antenna arrays
Generally, the information obtained as a result of a physical experiment proves to be partially corrupted due to action of various noise factors. The nature of these factors is dependent on the experimental conditions however, approaches to reducing their influence prove to be rather similar. The investigations carried out by the team of image processing of the Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine (IRE NASU) over the last ten years were oriented toward search for methods of extraction of maximum information from astronomical observations and space experiments. The investigations were conducted in several directions. For observations from the Earth's surface, the problem consisted in removing atmospheric phase distortions and synthesizing antenna configurations for telescopes and interferometers operating in various ranges of the electromagnetic wave spectrum. In the case of space astronomy, the efforts were concentrated at optimal interpretation of their results, in particular, at obtaining the planet relief and image processing with the effect of gravitational lensing. The common feature of the developed techniques is the use of the statistical approach, i.e., application of the mathematical statistics and theory of optimal statistical solutions. The present paper discloses both the general features of its approach and specific features of the obtained solutions in the case of particular problems of astronomical image processing. As a result of the performed investigation several techniques have been developed, including the method of Fourier component total phase accumulation for suppression of the atmospheric phase noise, the technique of optimum estimation of the point source intensity observed through the gravitational field of a distant galaxy, the method of accounting the altimetric information in photoclinometric determining the planet surface relief, and a number of techniques of designing antenna configurations for telescopes and interferometers. The statistical approach to processing experimental data has allowed using the information contained in a series of observations of an astronomical object for reconstruction of a single but more accurate its image. Owing to this it has become possible to unite in an optimal way the information contained in the surface images and altimetric data to obtain the surface relief with a high resolution and referencing to actual altitude magnitudes. In the case of treating gravitational mirages it has become possible to separate the observed source from the background. The obtained results demonstrate that the Bayesian statistical approach is a powerful tool in the researcher hands.
DETERMINATION OF RELEVANCE OF VISUAL OBJECT IMAGES BY APPLICATION OF STATISTICAL ANALYSIS OF REGARDING FRAGMENT REPRESENTATION OF THEIR DESCRIPTIONS
211-220
10.1615/TelecomRadEng.v78.i3.20
V. О.
Gorokhovatskyi
Kharkiv National University of Radio Electronics, 14 Nauka Ave., Kharkiv, 61166, Ukraine
S. V.
Gadetska
Kharkiv Educational and Scientific Institute of SHEI "Banking University", 55 Peremoga Ave., Kharkiv, 61174, Ukraine
computer vision
structural image recognition
descriptors of special image points
binary descriptor
statistical distribution of fragment values
description relevance
time of relevance calculation
The problem of visual object recognition in the space features of descriptors of special image points is solved with the application of statistical distributions for a system of fragments of image description. The efficiency of application of the distribution variants for single- and multi-bit sizes of the fragments of binary descriptors in the calculation of the level of relevance of descriptions in the process of object recognition is analyzed. Using software simulation, an experimental evaluation of the computation time of the relevance value in the constructed
feature space is carried out compared to the traditional voting approach of the set of descriptors. The efficiency of the proposed approach to data representation in terms of a significant increase in the performance rate with ensuring a sufficient level of recognition quality is confirmed.
AN IMPROVED DIRECTION OF ARRIVAL ESTIMATION METHOD FOR UNDERWATER TARGETS
221-228
10.1615/TelecomRadEng.v78.i3.30
W.
Hu
Wenzhou Vocational and Technical College, Chashan higher Education Park, Wenzhou 325035, Prov. Zhejiang, P.R. of China
L.
Mao
Southwest China Research Institute of Electronic Equipment, Rd. 496 Yingkang West, Jinniu District, Chengdu 610036, Prov. Zhejiang , P.R. of China
F.
Lu
Harbin Technician College, Limin West Eighth St., Hulan District, Harbin 150001, China
Q.
Guo
Harbin Engineering University, Rd. Nantong 145, Harbin 150001, Prov. Heilongjiang, P.R. of China
Y.
Zheng
Qingdao University, Rd. Ningxia 308, Qingdao 266071, Prov. Shandong, P.R. of China
Y.
Zhao
Harbin Engineering University, Rd. Nantong 145, Harbin 150001, Prov. Heilongjiang, P.R. of China
S. N.
Shulga
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
DOA estimation; underwater targets
active sonar sensors
time reversal
compressive sensing
Recent technology advances have shown that compressive sensing (CS) has excellent performance in the direction of arrival (DOA) estimation when the size of data sets is sufficiently less. Nevertheless, when the targets are in the underwater, it is difficult to obtain accurate DOA estimation due to multipath interference which destroy the channel scarcity. Therefore, while aiming for using multipath interference in the underwater, an improved DOA estimation method for underwater targets is proposed. In this paper, the time reversal (TR) theory is introduced into the DOA estimation based on CS. The received signal of sonar sensors is transmitted to the sea again after being time-reversed. The simulation results show that the proposed algorithm TRCS suppresses the clutter caused by multipath distortion and improves the DOA estimation performance in underwater environment significantly.
QUASI-OPTICAL MILLIMETER WAVE SOLID-STATE OSCILLATORS. PART 1: OPEN RESONANT SYSTEM
229-249
10.1615/TelecomRadEng.v78.i3.40
O. I.
Bilous
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
Anatoly Ivanovich
Fisun
A.Ya. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
A. A.
Kirilenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
M. P.
Natarov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A. I.
Shubnyi
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. P.
Sirenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
quasi-optics
open resonator
diffraction grating
decomposition
generalized scattering matrix
impedance
nonlinear component
Open resonant systems as the oscillating circuits of the solid-state oscillators and characteristics of the quasi-optical oscillators themselves are the objects of the investigation. The aim of the work is to review the scientific results on the development and research of quasi-
optical solid-state oscillators in the department of solid-state electronics from the inception of the idea to the development of real sources with enhanced spectral characteristics. Experimental and theoretical methods for studying the main parameters including spectrum, field topology of open resonators with resonant and non-resonant inhomogeneities are analyzed. For this purpose, the waveguide model of the resonator, the decomposition method and the generalized scattering matrix method, as well as experimental methods for measuring the spectrum, power and frequency, are used.
ANALYSIS OF HIGH-POWER NARROWBAND INTERFERENCE SUPPRESSION SYSTEM IN RADIOMETRIC RECEIVER
251-260
10.1615/TelecomRadEng.v78.i3.50
T. D.
Gutsol
State Agrarian and Engineering University in Podilya, 13 Schevchenko Str., Kamianets-Podilskyi 32300, Ukraine
A. D.
Cherenkov
Kharkiv Petro Vasylenko National Technical University of Agriculture, 44 Alchevskikh Str., Kharkiv 61002, Ukraine
O. G.
Avrunin
Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
Valerii
Semenets
Kharkiv National University of Radio Electronics
radiometric receiver
narrowband interference suppression
microwave key
automatic frequency control
voltage adder
phase detector
The subject of this article is analytical analysis of the method and circuit of high-power narrowband interference suppression in the vicinity of the local oscillator frequency. The used method is based on the automatic detection of interference combined with the local oscillator frequency and maintaining constancy of its signal. Interference cancellation scheme is based on the principle of operation of the modulation radiometer, in which the "meander" voltage switching unit controls the operation of the microwave key, the voltage adders and the phase detector. The circuits of automatic frequency tuning and adjustment of the amplitude of the local oscillator are independent and act continuously.
HIGH-FREQUENCY ELECTROSURGERY DEVICE WITH MICROPROCESSOR CONTROL AND SWITCHING- MODULATION SIGNAL FORMATION
261-267
10.1615/TelecomRadEng.v78.i3.60
О. P.
Yanenko
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" 37 Peremohy Ave., Kyiv 03056, Ukraine
K. L.
Shevchenko
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" 37 Peremohy Ave., Kyiv 03056, Ukraine
О. D.
Golovchanska
O. Bogomolets National Medical University, 34 Peremohy Ave., Kyiv 03056, Ukraine
O. I.
Pojda
O. Bogomolets National Medical University, 34 Peremohy Ave., Kyiv 03056, Ukraine
electrosurgery
spark discharge
pulse duration
switching modulation transformation
The paper discusses the possibility of constructing compact microprocessor device for microelectrosurgery and proposes functional chart of technologies using switching and modulation signal conversion. The use of single source for the formation of high-frequency and modulation signals, as well as the time-normalized pulse duration, provides an increase in the accuracy and stability of the formation of the spark discharge power.
EXTRACTION OF FETAL HEART ACTIVITY BY USING BISPECTRUM-BASED ELECTROMYOGRAPHY SIGNAL PROCESSING
269-279
10.1615/TelecomRadEng.v78.i3.70
O. G.
Viunytskyi
National Aerospace University, Department of Information and Сommunications
Тechnologies, named after O.O. Zelensky, Chkalova Str. 17, 61070, Kharkov,
Ukraine
V. I.
Shulgin
National Aerospace University, Department of Information and Сommunications
Тechnologies, named after O.O. Zelensky, Chkalova Str. 17, 61070, Kharkov,
Ukraine
A. V.
Totsky
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
O. A.
Polotska
V. Karazin National University of Kharkov,
4, Svoboda Sq., Kharkiv, 61077, Ukraine
fetal heart activity
fetal ECG
abdominal electromyography signal
third-order spectrum
bispectrum
phase coupling
bimagnitude estimate
QRS complex
This paper proposes the use of third-order spectrum named bispectrum that can be applied to biomedical diagnostics as a useful tool for detection of fetal heart activity. Fetal heart activity detection, recognition and analysis are proposed by extraction of informative features contained in bispectrum estimates computed for the electromyography signals measured on the abdominal surface of pregnant woman. Experimental investigations have been performed by using the recorded and accumulated abdominal electromyography signals. Contributions extracted in bispectral domain by computation of bimagnitude estimates demonstrate detection of novel class of information features indicating the phase coupling relationships between the frequencies contained in the abdominal electromyography signals. This phase coupling content can serve as discriminative feature for extraction fetal heart activity contribution in the intricate interference environment. Obtained results demonstrate effective interference suppression provided by using bispectrum-based signal processing.