scholarly journals Method of single-position determination of coordinates of radio emitting means

2020 ◽  
Vol 44 (4) ◽  
Author(s):  
V. S. Yegorov ◽  
Keyword(s):  
Communication Systems ◽  
Monitoring Systems ◽  
Radio Sources ◽  
Border Control ◽  
Conflict Zones ◽  
Radio Monitoring ◽  
Telecommunication Systems ◽  
International Transport ◽  
Economic Zones

Currently, the task of locating radio sources with complex types of modulation, wide bandwidth and low power is becoming increasingly important. The need to create radio monitoring systems and location of radio sources arises in both military (border control, local conflict zones) and civilian consumers (monitoring of navigation on international transport corridors and in special economic zones, search for sources of interference in telecommunication systems, detection of non-communication systems). in communication systems).

scholarly journals Antenna system with omnidirectional radiation pattern for systems with phase algorithms of direction finding

2019 ◽  
Vol 30 ◽  
pp. 05021
Author(s):  
Alexander Zhuravlev ◽  
Alexander Golovkov ◽  
Polina Terenteva ◽  
Victor Malyshev ◽  
Michail Shmyrin ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Communication Systems ◽  
Elevation Angle ◽  
Experimental Studies ◽  
Antenna System ◽  
Monitoring Systems ◽  
Digital Television ◽  
Horizontal Polarization ◽  
Radio Monitoring ◽  
Radiating Element

Ommidirectional in azimuth plane antennas with horizontal polarization are used in communication systems of McWILL standard, digital television systems of DVB-T2 standard, radio monitoring systems, semi-active ranging using the target illumination with the television broadcast signal, and many other cases. In many cases, radar and radio monitoring systems use phase methods to determine the azimuth and elevation angle of the target. To view all azimuthal angles, ring arrays consisting of omnidirectional emitters, usually also represented by ring arrays, are used. This paper studies the characteristics of an omnidirectional radiating element of electrically small horizontal dipole elements. An expression is derived that relates the radius of the dipole ring array to the number of dipoles and the variation of the resulting radiation pattern. The results are confirmed by experimental studies.

scholarly journals ADVANCED METHOD OF ANTENNA CALCULATION FOR RADIO MONITORING SYSTEMS OF ON-BOARD RADIO SOURCES

2021 ◽  
pp. 42-50
Author(s):  
N. M. Karashchuk ◽  
S. O. Sobolenko ◽  
V. O. Savenko ◽  
I. A. Tsykalov
Keyword(s):  
Dielectric Constant ◽  
Power Supply ◽  
Dielectric Substrate ◽  
Power Line ◽  
Effective Dielectric Constant ◽  
Monitoring Systems ◽  
Radio Sources ◽  
Broadband Antennas ◽  
Radio Monitoring ◽  
Traveling Wave Antenna

Analysis of the experience of modern armed struggle shows that timely detection of signals onboard radio sources by radio monitoring systems is an important task. One way to ensure its solution is the use of compact broadband antennas in the centimeter range. Therefore the development and improvement of methods for calculating broadband compact antennas in the centimeter wave range is an important and relevant scientific and practical task. An improved method for calculating a traveling wave antenna based on irregular symmetrical slit lines located arranged on a multilayer dielectric substrate (Vivaldi antennas) is proposed, by taking into account the thickness of the dielectric substrate, the relative effective dielectric constant of the substrate layers and two-way power supply to improve the directional properties of the antenna and its coordination in a given frequency band. In particular, the formulas of the phase multiplier of the system (for two radiating elements) and the resulting pattern of the antenna take into account the two-way power supply and the thickness and relative dielectric constant of the substrate. These advanced formulas for calculating and selecting these options antennas, lengths; maximum and minimum slot width; the coefficient of opening the gap; the width of the strip of symmetrical microstrip power line at the connection of the coaxial power line; the width of the strip at the intersection with the slit line; the width of the symmetrical slit line at the base of the opening; the length of a quarter-wave transformer based on a symmetrical microstrip line; the length of the symmetric microstrip power line; slit length; resonator diameter; the radius of the cover of the structural capacitor. The practical significance of the results obtained lies in the possibility of an approximate calculation of compact broadband antennas in the centimeter wavelength range. The results make it possible to model and manufacture these antennas for radio monitoring systems for onboard radio sources.

scholarly journals Methods of Determination of Optimal Points of Radio Monitoring Means Placement

2021 ◽  
Vol 7 (5) ◽  
pp. 2001-2009
Author(s):  
Serhii Dupelych ◽  
◽  
Viktor Bovsunovskyi ◽  
Dmytro Dmytro akymets ◽  
Oleksandr Zhantalai ◽  
...  
Keyword(s):  
Monitoring System ◽  
Optimization Problem ◽  
Radio Sources ◽  
Mathematical Apparatus ◽  
Radio Monitoring ◽  
Monitoring Tools ◽  
Different Types ◽  
The Matrix

The effectiveness of the radio monitoring system depends on the correctness of determining the coordinates of the location of radio monitoring tools at the stage of planning their application. The decision on the choice of position for radio monitoring should consider the heterogeneity of the terrain in the area of tasks, the presence of natural and electronic interference, which can lead to deterioration of conditions for receiving signals from radio sources. The use of the known methods, techniques, and algorithms for the placement of radio monitoring tools does not fully consider the requirements mentioned above. This leads to a decrease in the effectiveness of radio monitoring in a particular area of performance. Therefore, the purpose of this article is to develop a methodology for spatial placement of radio monitoring to ensure the effectiveness of radio monitoring in a particular area of tasks, taking into account the heterogeneity of the terrain, as well as natural and artificial electronic interference. Determining the coordinates of radio monitoring facilities included in the radio monitoring system involves determining the allowable options for their placement in a particular area of tasks using the mathematical apparatus of the dense placement function and its hodograph and further thinning of the matrix of acceptable solutions based on restrictions. A distinctive feature of the proposed approach is the optimization problem of geometric design for radio monitoring of complex spatial forms. At the same time, the peculiarities of completing the radio monitoring system using different types are also taken into account. It is expedient to use the developed technique for the planning of application of the system of radio monitoring; formation of working decisions on the construction of the radio monitoring system; assessing the quality of decisions and the formation of alternatives; ensuring the adaptation of the structure of the radio monitoring system to changes in the situation under the influence of the enemy and the formation of new zones of electronic interference.

Radio Monitoring Systems and Determination of Radio Emission Sources Location

2009 ◽  
pp. 317-391
Author(s):  
Anatoly Rembovsky ◽  
Alexander Ashikhmin ◽  
Vladimir Kozmin ◽  
Sergey Smolskiy
Keyword(s):  
Radio Emission ◽  
Monitoring Systems ◽  
Emission Sources ◽  
Radio Monitoring

Actual issues of systematization of scientific knowledge on the conditions of shot in the forensic ballistics

2020 ◽  
Vol 2020 (3) ◽  
pp. 164-169
Author(s):  
Igor' Latyshov ◽  
Fedor Samuylenko
Keyword(s):  
Scientific Knowledge ◽  
Communication Systems ◽  
Production Method ◽  
Natural Phenomenon ◽  
Projectile Energy ◽  
Energy Characteristics ◽  
Shot Classification ◽  
Forensic Ballistics

In this research, there was considered a challenge of constructing a system of scientific knowledge of the shot conditions in judicial ballistics. It was observed that there are underlying factors that are intended to ensureits [scientific knowledge] consistency: identification of the list of shot conditions, which require consideration when solving expert-level research tasks on weapons, cartridges and traces of their action; determination of the communication systems in the course of objects’ interaction, which present the result of exposure to the conditions of the shot; classification of the shot conditions based on the grounds significant for solving scientific and practical problems. The article contains the characteristics of a constructive, functional factor (condition) of weapons and cartridges influence, environmental and fire factors, the structure of the target and its physical properties, situational and spatial factors, and projectile energy characteristics. Highlighted are the forms of connections formed in the course of objects’ interaction, proposed are the author’s classifications of forensically significant shooting conditions with them being divided on the basis of the following criteria: production from the object of interaction, production from a natural phenomenon, production method, results weapon operation and utilization, duration of exposure, type of structural connections between interaction objects, number of conditions that apply when firing and the forming traces.

Determination of the Size Distribution of Dissolved Organics in Effluents

1973 ◽  
Vol 8 (1) ◽  
pp. 1-15 ◽  
Author(s):  
L.A. Addie ◽  
K.L. Murphy ◽  
J.L. Robertson
Keyword(s):  
Size Distribution ◽  
Biological Treatment ◽  
Oxygen Demand ◽  
Molecular Size ◽  
Monitoring Systems ◽  
Clean Surface ◽  
Sephadex Column ◽  
Dissolved Organics ◽  
Molecular Size Distribution

Abstract The importance of removing the small amounts of residual organics is increasing as the sources of clean surface water decrease. Knowledge of the nature of these soluble residual organics will be needed in order to assess the type of treatment required for their removal. Residual organics in three different biological treatment plants were analyzed and compared. An attempt was made to characterize these organics by a molecular size distribution on a Sephadex column monitored by differential ultraviolet and refractive index detectors. The organic carbon and chemical oxygen demand of the fractions collected from the column was also determined. An investigation of some of the problems inherent in the monitoring systems was conducted.

Nýting ljósleiðara á Íslandi

2017 ◽  
Vol 23 ◽  
pp. 32-36
Author(s):  
Sæmundur E. Þorsteinsson
Keyword(s):  
Mobile Communication ◽  
Rural Areas ◽  
Communication Systems ◽  
Access Network ◽  
Access Networks ◽  
Optical Fibres ◽  
Core Network ◽  
Leading Role ◽  
Telecommunication Systems ◽  
Optical Ring

General deployment of optical fibre technology commenced in the eighties. Its introduction revolutionised the telecommunications arena and has become the foundation of most telecommunication systems in use today. Optical fibres connect continents and countries, are used in core and access networks and for backhauling of mobile communication systems. The internet would barely exist without optical fibres and globalisation would hardly have seen the dawn of light. Three submarine optical cables connect Iceland to the outside world; Farice and Danice connect Iceland to Europe and Greenland Connect to America via Greenland. The optical ring around Iceland constitutes the Icelandic core network. The ring passes by nearly all villages and towns and fibre deployment in the access network has reached an advanced state. Fibre deployment in rural areas has already begun and will presumably be finished in a few years. Iceland plays a leading role in fibre deployment. In this paper, fibre utilisation in Iceland will be described, both in core and access networks. Three different architectures for fibre deployment in the access network will be described. Competition on fibre networks will also be discussed.

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