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 Using of New Narrowband Waveforms to Ensure Proper Operation of Command and Communication Systems

2018 ◽  
Vol 215 (4) ◽  
pp. 47-61
Author(s):  
Robert Matyszkiel ◽  
Bogusław Grochowina ◽  
Adam Dobkowski ◽  
Marcin Wiśniewski ◽  
Paweł Domaros
Keyword(s):  
High Frequency ◽  
Communication Systems ◽  
Radio Communication ◽  
Very High Frequency ◽  
Communication Devices ◽  
Working Groups ◽  
Basic Services ◽  
Radio Systems ◽  
Services Implementation ◽  
Proper Operation

Abstract Accomplishment of basic services implementation with specific quality is one of the main challenges of the command and communication systems for modern maritime safety and defense. The specificity of the marine environment imposes the use of narrowband HF (High Frequency) and VHF (Very High Frequency) radio communication devices which are capable to implement IP transmission. This paper presents the requirements for the HF and VHF radio systems according to the IP protocol requirements. At the beginning basic properties of narrowband HF and VHF waveforms in context of their operational scenarios has been described. Then results of experimental research (implementation of narrowband services — voice and data) has been presented. Finally further research directions with contribution of the authors, in NATO working groups related to the development of NBWF (Narrowband Waveform) for coalition communication has been presented.

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 A Novel Electromagnetic Compatibility Evaluation Method for Receivers Working under Pulsed Signal Interference Environment

2021 ◽  
Vol 11 (20) ◽  
pp. 9454
Author(s):  
Shaoxiong Cai ◽  
Yaoyao Li ◽  
Heng Zhu ◽  
Xiaolin Wu ◽  
Donglin Su
Keyword(s):  
Electromagnetic Interference ◽  
Communication Systems ◽  
Electromagnetic Compatibility ◽  
Evaluation Method ◽  
Coupling Effect ◽  
Pulse Signal ◽  
Satellite System ◽  
Signal Interference ◽  
Effect Analysis ◽  
The Impact

For wireless communication systems, receivers usually work under complex electromagnetic environments and are often susceptible to electromagnetic interference (EMI). With the wide application of pulse signals in various fields, the impact of pulse signals on the receivers of communication system has not been extensively studied. On the one hand, the existing receiver electromagnetic sensitivity (EMS) interference coupling effect is mainly analyzed from the perspective of energy only, without considering of different electromagnetic parameter characteristics of pulse signal, such as pulse width, repetition period, duty cycle and so on. On the other hand, there is a lack of quantitative characterization of typical performance indexes of receiver subject to pulsed interference environment, resulting in insufficient reliability and accuracy of receiver interference degree prediction and electromagnetic compatibility (EMC) evaluation. This paper focuses on the EMS interference coupling effect analysis and EMC evaluation method of receiver under pulsed interference environment. First, based on the analysis of the interference mechanism of the pulse signal on receivers, the formula for the bit error ratio (BER) is derived. Then a system model is proposed to verify the theoretical analysis results through numerical simulation. With the established relationship between the parameters of the pulsed interference and the BER performance of the receiver, a novel EMC evaluation method has been proposed. As a practical application example, the evaluation method is verified via a well-designed experiment on BeiDou Navigation Satellite System (BDS). The experiment shows that the observed phenomena are in good agreement with the conclusions of the proposed evaluation method, proving that the method is applicable to the EMC evaluation of receiver under pulsed signal interference environment.

Performance Bounds for VDES R-mode

2019 ◽  
Vol 73 (1) ◽  
pp. 92-114 ◽  
Author(s):  
Jan Šafář ◽  
Alan Grant ◽  
Paul Williams ◽  
Nick Ward
Keyword(s):  
Data Exchange ◽  
Estimation Error ◽  
Additive White Gaussian Noise ◽  
Automatic Identification ◽  
Identification System ◽  
Performance Bounds ◽  
Radio Communication ◽  
Very High Frequency ◽  
Radio Communication System ◽  
The Impact

The Very High Frequency (VHF) Data Exchange System (VDES) is a new radio communication system being developed by the international maritime community, with the principal objectives to safeguard existing Automatic Identification System (AIS) core functions and enhance maritime communication applications, based on robust, efficient and secure data transmission with wider bandwidth than the AIS. VDES is also being considered as a potential component of the R-mode concept, where the same signals used for communication are also used for ranging, thus mitigating the impact of disruptions to satellite positioning services. This paper establishes statistical performance bounds on the ranging precision of VDES R-mode, assuming an additive white Gaussian noise propagation channel. Modified Cramér-Rao bounds on the pseudorange estimation error are provided for all waveforms currently proposed for use in terrestrial VDES communications. These are then used to estimate the maximum usable ranges for AIS/VDES R-mode stations. The results show that, under the assumed channel conditions, all of the new VDES waveforms provide better ranging performance than the AIS waveform, with the best performance being achieved using the 100 kHz bandwidth terrestrial VDE waveforms.

scholarly journals Non Directional Beacons Checking

2014 ◽  
Vol 2 (2) ◽  
pp. 12-16
Author(s):  
Ján Pitor ◽  
◽  
Filip Škultéty
Keyword(s):  
Electromagnetic Compatibility ◽  
Air Transport ◽  
Inspection System ◽  
Radio Communication ◽  
Standard Instrument ◽  
Radio Navigation ◽  
Centre Of Excellence ◽  
The Impact ◽  
Communication Equipment

This paper aims to familiarize experts from other fields with issues of flight check of Non Directional Beacon (NDB) and its assessment. The AT-940 Automatic Flight Inspection System and the aircraft PIPER SENECA are described followed by flight check specifications and procedures. Evaluated were the coverage of NDB Z, NDB ZLA located at Žilina airport and Standard Instrument Approach Procedure for runway 06. The results of evaluation are in paragraph 4. The paper is based on project “Centre of excellence for Air Transport” focused on the impact of air transport on environment photogrammetry, surveillance of electromagnetic compatibility of radio navigation aids and radio communication equipment.

scholarly journals Complex methodology of parameters management of military radio networks in the conditions of uncertainty of the radioelectronic situation

2020 ◽  
pp. 73-85
Author(s):  
А.В. Шишацький ◽  
Ю.В. Журавський ◽  
В.М. Остапчук ◽  
М.В. Сова ◽  
О.Д. Гаращук ◽  
...  
Keyword(s):  
Communication Systems ◽  
Open Systems ◽  
Radio Networks ◽  
Open Architecture ◽  
Reference Network ◽  
Radio Communication ◽  
Network Resources ◽  
Radio Communications ◽  
Electronic Environment ◽  
Radio Systems

The experience of the Joint Forces operation (Anti-terrorist operation in Donetsk and Luhansk oblasts) shows that the current order of management of military radio communication systems does not always meet the modern requirements for them. The classic centralized approach to the management of channel and network resources of military radio systems does not quite meet modern requirements, so the authors of this article proposed to take mobile self-organizing networks as a basic principle of construction. The authors propose a comprehensive method of managing the parameters of military radio networks in conditions of uncertainty of the electronic environment, the essence of which is to ensure the maintenance of the specified values of the performance of military radio communication systems at the appropriate level. The article is based on the control principle, which is described in the reference network model of open systems interaction, but with some additions and changes. This approach generally allows for end-to-end management of channel and network resources of military radio systems in a complex electronic environment. In the article, the device of fuzzy logic, the theory of electronic suppression, neural networks, the theory of noise protection, the theory of antennas, noise-resistant coding are used. The proposed complex methodology should be used in the development of software for modules (units) for the assessment of advanced radio communications, based on open architecture interfaces version SCA 2.2, which will: use effective signal-code structures to ensure noise immunity of channels; to ensure efficient use of the radio frequency resource of programmable radio communication means; increase the speed of evaluation of communication channels; reduce the use of computing resources of radio communications with programmable architecture.

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.

The Formation of Signal Construct of Complex Structures with a High Level of Uncertainty in Their Parameters

2021 ◽  
Vol 27 (3) ◽  
pp. 132-137
Author(s):  
S. V. Dvornikov ◽  
◽  
A. V. Pshenichnicov ◽  
S. S. Manaenko ◽  
I. N. Glukhikh ◽  
...  
Keyword(s):  
Random Graph ◽  
Communication Systems ◽  
Complex Structure ◽  
Practical Significance ◽  
Practical Implementation ◽  
Complex Structures ◽  
Radio Communication ◽  
Modulation Formats ◽  
Theoretical Approaches ◽  
Radio Systems

Radio communication systems with enhanced resistance to illegitimate influences are of great interest in the development of modern information technologies. The modern methods of implementing such radio systems are the technologies of cryptographic information protection, methods of direct spectrum expansion. Despite the achievements of the selected subject area, the practical implementation of radio systems of this level is hampered by models of radio communication channels. Known results in their totality do not take into account the potential capabilities of implemented modulation formats, which limits their practical application and indicates the relevance of the study. The aim of the scientific work is to formalize theoretical principles and approaches to the formation and evaluation of the effectiveness of signals of complex structure. The authors posed and solved the problem of a formalized presentation of the obtained solutions, conducted a critical analysis of the results obtained by different methods. In this case, methods of statistical radio engineering, harmonic analysis of discrete signals, random graph theories, and decision making were used. The authors conducted a simulation of the processes of manifestation of various structures of the generated signals. The coincidence of theoretical and practical results is substantiated. During the study, the properties of signals of complex structures were determined. A theoretical statement is formulated and proved that justifies the increase in the structural secrecy properties of the generated radio signals. The novelty of the approach is the use of random graph theory, which has reduced the complexity of the evidence base, the stages of simulation. The theoretical results obtained are critically evaluated in relation to the final modeling data, which made it possible to substantiate the adequacy of the results. The obtained solutions substantiate theoretical approaches to the formation of signal construct of complex structure. In contrast to the known studies, the study reveals the potential stability boundaries of radio systems based on signals with uncertain parameters. The theoretical significance of the presented results is the expansion of the practical implementation of the methods of the general theory of communication in the field of building noise-immune systems. Practical significance is based on the results of analytical and simulation modeling presented in the work.

scholarly journals Two-Step Beveled UWB Printed Monopole Antenna with Band Notch

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yan Xiao ◽  
Zhong-Yong Wang ◽  
Ji Li ◽  
Zi-Lun Yuan ◽  
A. K. Qin
Keyword(s):  
Electromagnetic Interference ◽  
Communication Systems ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Local Area ◽  
Ultra Wideband ◽  
Area Network ◽  
Radio Communication ◽  
Printed Monopole

This paper presents a novel compact printed monopole ultra-wideband (UWB) antenna featured with the band notch. The proposed antenna consists of a two-step beveled radiant patch and a truncated ground plane, which can provide a good impedance matching from 3.1 GHz to 10.6 GHz. In order to generate the band-notched characteristics, two symmetrical slots are embedded along with the microstrip feeding line, resulting in a band notch from 5.05 GHz to 5.85 GHz. Accordingly, the mutual electromagnetic interference between the UWB and wireless local area network (WLAN) radio communication systems can be eliminated. In addition, it is shown how the slots integrated on the ground plane improve the radiation patterns. The experimental measurements are found to be in good agreement with the numerical simulations.

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