scholarly journals Characteristics and Parameters of Land Mobile Service Units Necessary for EMC Analysis in Shared Frequency Bands: Analytical Survey

2020 ◽  
Vol 6 (2) ◽  
pp. 6-18
Author(s):  
B. Antipin ◽  
E. Vinogradov
Keyword(s):  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Rapid Development ◽  
Mobile Service ◽  
Radio Communication ◽  
Land Mobile Service ◽  
Frequency Bands ◽  
Radio Receivers ◽  
Radio Transmitters ◽  
Basic Parameters

The analysis of frequency bands allocated among radio services in the Table of frequency allocations reveals that every band is utilized by several different radio services. The sharing of frequency bands by radio services requires that electromagnetic compatibility of the radio electronic equipment belonging to these services shouldbe ensured. Currently there is a rapid development of land mobile radio communication systems. There are concidered the basic parameters of radio transmitters and radio receivers belonging to ATP systems, which are necessary for the electromagnetic compatibility analyzing of such systems between themselves and with other systems sharing a certain frequency band. We can observe ways of using some characteristics.

scholarly journals Influence of Aircraft Power Electronics Processing on Backup VHF Radio Systems

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 777
Author(s):  
Jan Leuchter ◽  
Radim Bloudicek ◽  
Jan Boril ◽  
Josef Bajer ◽  
Erik Blasch
Keyword(s):  
Power Electronics ◽  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Intermediate Frequency ◽  
Radio Communication ◽  
Very High Frequency ◽  
Switching Power ◽  
Radio Systems ◽  
The Impact

The paper describes the influence of power electronics, energy processing, and emergency radio systems (ERS) immunity testing on onboard aircraft equipment and ground stations providing air traffic services. The implementation of next-generation power electronics introduces potential hazards for the safety and reliability of aircraft systems, especially the interferences from power electronics with high-power processing. The paper focuses on clearly identifying, experimentally verifying, and quantifiably measuring the effects of power electronics processing using switching modes versus the electromagnetic compatibility (EMC) of emergency radio systems with electromagnetic interference (EMI). EMI can be very critical when switching power radios utilize backup receivers, which are used as aircraft backup systems or airport last-resort systems. The switching power electronics process produces interfering electromagnetic energy to create problems with onboard aircraft radios or instrument landing system (ILS) avionics services. Analyses demonstrate significant threats and risks resulting from interferences between radio and power electronics in airborne systems. Results demonstrate the impact of interferences on intermediate-frequency processing, namely, for very high frequency (VHF) radios. The paper also describes the methodology of testing radio immunity against both weak and strong signals in accordance with recent aviation standards and guidance for military radio communication systems in the VHF band.

scholarly journals Technique of radio suppression of a radio communication system in a Wі­Fі network from noise­like signals based on the HTTP/3 рrotocol

Connectivity ◽  
2020 ◽  
Vol 145 (3) ◽  
Author(s):  
V. M. Cherevyk ◽  
◽  
A. V. Glushchuk
Keyword(s):  
Data Transmission ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Power Level ◽  
Pseudorandom Sequence ◽  
Radio Communication ◽  
Electronic Warfare ◽  
Radio Communications ◽  
Pulse Interference ◽  
Radio Communication System

The article presents the results of the analysis of the existing method of radio suppression of radio communication systems in Wi-Fi networks, and conclusions are drawn regarding ways to increase its effectiveness. The method of radio suppression of radio communication systems with noise-like signals was chosen. It contains the implementation of structural obstacles and a scheme for smooth control of their power implemented in the HTTP/3 protocol. This makes it possible to increase the effectiveness of a jamming station with radio suppression of certain radio communication systems and reduce radioelectronic control equipment requirements. For the applied implementation of this technique in a jamming station, it is necessary to predict a reconnaissance tool covering the reception, determination and estimation of the parameters of noise-like signals; structural interference block; unit execution and regulation of the required power level of structural interference. One of the main tasks is to suppress radio communication systems (SRS). However, with the advance of digital technologies in speech and data transmission, noise-signaling (SHP) signals are increasingly being used to improve the noise immunity and latency of SRHs. One way to implement such signals is to modulate the carrier frequency by a pseudorandom sequence. The issue with productive radio suppression (RP) of SRWs with SHPS has been developing quite actively in recent years, and still remains relevant. Based on the features and means of electronic warfare (EWB), the SPS radio communications systems may be muted by the application of high-power shielding, narrowband or pulse interference. But this method does not cover minimization of radiolabeling of EW methods and can lead to electromagnetic compatibility violations.

Estimation of electromagnetic compatibility of a narrow-band radio channel under the influence of unintended interference of the radar complicated pulse signals

2021 ◽  
pp. 77-85
Author(s):  
V.V. Bykov ◽  
V.A. Gandurin ◽  
V.B. Grebennikov ◽  
F.V. Poberezhnik
Keyword(s):  
Electromagnetic Compatibility ◽  
Narrow Band ◽  
Radio Channel ◽  
System Of Differential Equations ◽  
Radio Communication ◽  
Complex Signals ◽  
Radio Receivers ◽  
A Chain ◽  
Parameters Of Signals ◽  
Chain Approximation

The relevance of estimation of the electromagnetic compatibility (EMC) of narrow-band radio communication channels under the influence of unintended interference (UI) from radars with complex signals is due to the widespread use of both the first and second ones. At the same time, its equipment is often installed at the same carriers, which further complicates the task of providing EMC. The specificity of this situation is that narrow-band radio channels occupy a frequency band measured in few kilohertz, and the width of the spectrum of complicated signals used by radars is several and tens of megahertz. Under these conditions, during the preliminary estimation of the EMC, it is advisable to use the method of mathematical modeling and approximate a narrow-band radio receiving device (RRD) exposed to broadband UI with an equivalent circuit characterized with a given degree of accuracy by the parameters of this RRD. In this case, we used a chain approximation of the 4th order. This chain is represented by a system of differential equations that is solved in MATLAB. As a result of calculations, the dependence of the coefficient of suppression of unintended interference on the parameters of signals, interference and radio receivers was found. It was found that in the example under consideration, the suppression of unintended interference is at least 37 dB.

scholarly journals Electromagnetic Safety of Remote Communication Devices—Videoconference

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 323
Author(s):  
Artur Przybysz ◽  
Krystian Grzesiak ◽  
Ireneusz Kubiak
Keyword(s):  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Security And Privacy ◽  
Data Confidentiality ◽  
Remote Communication ◽  
Radio Receivers ◽  
Video Signals ◽  
Related Data ◽  
Communication Devices ◽  
Audio Data

Devices powered by electricity become sources of electromagnetic emissions in the course of their operation. In the case of devices oriented to process information, these emissions can have a character of revealing emissions, i.e., those whose reception and analysis allow for remote reconstruction of related data. The best known example of this phenomenon is the formation of revealing emissions during the operation of imaging devices: monitors, projectors or printers. Increasingly more often, these components are used for communication in the form of videoconferences with other network users. The article presents the result of tests and analyses of threats related to the use of such solutions (monitors, personal computers, VoIP terminals) for the confidentiality of conversations and the data presented during them. The focus is on video signals; however, the potential possibilities of revealing speech signals were also indicated. Such phenomenon causes a huge threat to data confidentiality because the combination of graphics and sound can undoubtedly contain much more information about the protected data than just graphics or sound separately. The presented results of analyses apply to graphic data, possibilities of non-invasive acquisition of such data, similarity of images and of patterns and reconstructed image and image recognition. The results indicate that there is still a risk of loss of data confidentiality due to a phenomenon of an electromagnetic leakage, and specialized instrumentation is not required for its interception under favorable circumstances. This may particularly apply to audio data that may be accidentally received by home radio receivers. In particular, the presented results of analyses apply to a Special Issue of Symmetry which is characterized by security and privacy in communication systems and networks, signal processing, video and image processing, multimedia communications and electromagnetic compatibility. All these scientific and technical areas have either symmetrical or asymmetrical approaches, and they have to be taken into consideration as a whole in order to choose the best combinations to protect processed information.

CONSIDERATION OF EXISTING CALCULATION METHODOLOGIES OF ELECTROMAGNETIC COMPATIBILITY OF TERRESTRIAL RADIO COMMUNICATION SYSTEMS

2020 ◽  
Author(s):  
С.Р. РОМАНОВ
Keyword(s):  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Evaluation Criteria ◽  
Radio Communication

Рассмотрены различные методики расчета межсистемной электромагнитной совместимости наземных систем радиосвязи. Приведены критерии оценки выбранных методик. The article is devoted to the consideration of various calculation methodologies of electromagnetic compatibility of terrestrial radio communication systems. Evaluation criteria for the selected methodologies are given.

scholarly journals Electromagnetic Spectrum of the Corona Discharge and Their Fundamental Frequency

2021 ◽  
Author(s):  
Luis E. Martínez Santos ◽  
Roberto Linares y Miranda ◽  
Fermín P. Espino-Cortés
Keyword(s):  
Corona Discharge ◽  
Electromagnetic Interference ◽  
High Frequency ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Design Criterion ◽  
Past Century ◽  
Electromagnetic Spectrum ◽  
Radio Communication ◽  
High Voltage Direct Current

Historically, the Electromagnetic Compatibility (EMC) began with the disturbances at the radio navigation systems generated by the electrical power distribution lines; hence it was referred to as Radio Interference (RI). This disturbance is an Electromagnetic Interference (EMI). Although this type of EMI has been studied since the first decades of the past century, it still maintains a continued interest of the researchers, especially with the Corona Discharge (CD), generated by High Voltage Direct Current (HVDC) systems. Because of its design criterion and the concern that this phenomenon may affect the new radio communication systems in the very high frequency (VHF), ultra high frequency (UHF), and microwave bands, interest in their studies continues. In this chapter, an analysis of the electromagnetic spectrum of the CD is presented. The CD is generated at a short transmission line located within a semi-anechoic chamber. To be sure of the phenomenon, the CD is identified by its current pulse, which is well studied. The instruments used are an oscilloscope of 2 GHz and 2 GS/s, a spectrum analyzer, and an EMI test receiver. The results show that the CD concentrates its energy at frequencies below 70 MHz. In the UHF band, only narrowband signals very separated were found, with levels that cannot affect radio communication systems.

scholarly journals Wideband Performance Comparison between the 40 GHz and 60 GHz Frequency Bands for Indoor Radio Channels

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1234 ◽  
Author(s):  
Miguel Riobó ◽  
Rob Hofman ◽  
Iñigo Cuiñas ◽  
Manuel García Sánchez ◽  
Jo Verhaevert
Keyword(s):  
Communication Systems ◽  
Radio Channel ◽  
Numerical Data ◽  
Performance Comparison ◽  
Line Of Sight ◽  
Indoor Environments ◽  
60 Ghz ◽  
Radio Communication ◽  
Frequency Bands ◽  
Advantages And Disadvantages

When 5G networks are to be deployed, the usability of millimeter-wave frequency allocations seems to be left out of the debate. However, there is an open question regarding the advantages and disadvantages of the main candidates for this allocation: The use of the licensed spectrum near 40 GHz or the unlicensed band at 60 GHz. Both bands may be adequate for high performance radio communication systems, and this paper provides insight into such alternatives. A large measurement campaign supplied enough data to analyze and to evaluate the network performance for both frequency bands in different types of indoor environments: Both large rooms and narrow corridors, and both line of sight and obstructed line of sight conditions. As a result of such a campaign and after a deep analysis in terms of wideband parameters, the radio channel usability is analyzed with numerical data regarding its performance.

scholarly journals DESIGN OF LENS ANTENNA WITH PLANAR ORTHOMODE TRANSDUCER FOR 28 GHZ FIXED SERVICE COMMUNICATION SYSTEMS

2019 ◽  
Vol 22 (3) ◽  
pp. 48-62
Author(s):  
Andrey V. Mozharovskiy
Keyword(s):  
Distribution System ◽  
Computer Aided Design ◽  
Communication Systems ◽  
Circuit Board ◽  
Design System ◽  
Frequency Range ◽  
Radio Communication ◽  
Lens Antenna ◽  
Frequency Bands ◽  
Aperture Efficiency

Introduction. Millimeter-wave frequency range can provide utilization of wide transmission frequency bands and therefore a significant increase of the capacity in modern communication systems. One of the main concerns in the design of the 27.5…29.5 GHz-wave communication system is a high gain antenna of the range of 30 dBi to compensate the significant level of radio signal attenuation in the communication channel compared to the traditional frequency bands below 6 GHz. Objective. Development of the integrated lens antenna with the ability to operate on two orthogonal linear polarizations to separate the transmitted and received signals by polarization and, therefore, to create more efficient use of the spectrum. At the same time, an important task is to provide a high aperture efficiency of the antenna and a low level of insertion loss in the distribution system, which should have an interface based on printed transmission lines for connection to the radio frequency circuit elements realized on the printed circuit board. Materials and methods. The main method of the analysis of the lens antenna characteristics is full-wave electromagnetic simulation in the computer-aided design system CST Microwave Studio. The results are confirmed with experimental samples measurement. Results. The designed antenna is an integrated lens antenna consisting of a homogeneous semi-elliptical dielectric lens with a diameter of D = 120 mm with a cylindrical extension and a primary radiator based on a microstrip antenna with a waveguide adapter. Waveguide adapter radiating opening dimensions were optimized using an analytical method based on a combination of geometrical and physical optics. Two orthogonal polarizations are excited on the primary microstrip patch antenna with the corresponding closely spaced “H-type” slots in one internal metallization layer. According to experimental results, the designed antenna provides the gain level of 29.5…30.2 dBi with a halfpower beamwidth of 4.8…5.1 degrees and cross-polarization level exceeding 37 dB for both polarizations in the whole frequency band of 27.5…29.5 GHz. Conclusion. The simplicity of the design, high aperture efficiency and the ability to operate on two orthogonal linear polarizations show that the developed lens antenna can be successfully used in radio communication systems of the 27.5…29.5 GHz frequency range.

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