SYNCHRONIZATION IN TIME-DUPLEX RADIO SYSTEMS

2021 ◽  
Author(s):  
Г.О. БОКК ◽  
Р.С. АВЕРЬЯНОВ
Keyword(s):  
Gaussian Noise ◽  
Communication System ◽  
Optimal Algorithm ◽  
Multipath Propagation ◽  
Radio Communication ◽  
Propagation Models ◽  
Synchronization Mode ◽  
Radio Systems ◽  
Stationary Conditions ◽  
Basic Version

Рассмотрена работа в режиме синхронизации системы связи стандарта МАКВИЛ, использующей организацию радиосвязи с временным дуплексом. Получен базовый вариант оптимального алгоритма обработки одиночных замеров син -хронизации, ориентированный на работу в канале с белым гауссовским шумом при неизвестных, но стабильных спектральных искажениях сигнала. На основе разработанного алгоритма предложено множество вариантов статистического накопления измерений для режима синхронизации в нестационарных условиях. На моделях многолучевого распространения, утвержденных международными рекомендациями, выявлены наилучшие варианты алгоритмов синхронизации с накоплением. Operation in synchronization mode of the McWiLL standard communication system, using the organization of radio communication with time duplex, is considered. A basic version of the optimal algorithm for processing single synchronization measurements is obtained, which is focused on working in a channel with white Gaussian noise at unknown but stable spectral distortions of the signal. Based on the developed algorithm, many variants of statistical accumulation of measurements for the synchronization mode in non-stationary conditions are proposed. Using multipath propagation models approved by international recommendations, the best variants of synchronization algorithms with accumulation are identified.

METHOD FOR INCREASING TRANSFER RATE IN HF RADIO SYSTEMS AND ITS IMPLEMENTATION (part 1)

2020 ◽  
pp. 7-22
Author(s):  
B. G. Shadrin ◽  
V. A. Dvoryanchikov ◽  
B. S. Bogankov
Keyword(s):  
Frequency Band ◽  
Communication System ◽  
Communication Systems ◽  
Transfer Rate ◽  
Communication Channel ◽  
Block Diagram ◽  
Radio Communication ◽  
External Interference ◽  
Radio Systems ◽  
Radio Communication System

A method for increasing the transfer rate in HF radio communication systems is proposed, which, in comparison with existing methods, allows it to be doubled without expanding the frequency band occupied by the communication channel. The block diagram of one of the variants of the HF radio communication system that implements the proposed method is presented. The analysis of the operation of the communication system in the absence of external interference and the influence of interference concentrated over the spectrum is carried out.

scholarly journals Development of the method of structural-parametric synthesis of the subsystem of interference of special purpose radio communication systems

2021 ◽  
Vol 3 (1(59)) ◽  
pp. 40-44
Author(s):  
Andrii Shyshatskyi ◽  
Vitalii Hasan ◽  
Anatolii Hasan ◽  
Serhii Kravchuk ◽  
Yuriy Shidlovsky ◽  
...  
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Queuing Theory ◽  
Noise Immunity ◽  
Radio Communication ◽  
Parametric Synthesis ◽  
Radio System ◽  
Radio Systems ◽  
Radio Communication System ◽  
The Military

The object of research is the military radio communication system. One of the most problematic areas in the management of military radio resources is the interference of military radio systems and facilities. A number of works have been devoted to the research of ways to increase the noise immunity of military radio communication systems and facilities. However, the known works contain some results of research by scientists aimed at increasing the noise immunity of military radio systems and facilities and do not have a comprehensive approach. In this article, the problem of developing a method of structural-parametric synthesis of the noise protection subsystem of special purpose radio communication systems is solved. The scientific problem is solved by formalizing the problem of structural-parametric synthesis of the noise protection subsystem of military radio communication systems, starting with its mathematical description and synthesis of the quantitative and qualitative structure of the noise protection subsystem. In the course of the research, the authors used the main provisions of the queuing theory, the theory of automation, the theory of complex technical systems and general scientific methods of cognition, namely analysis and synthesis. The novelty of this technique is the synthesis of the structure of the military radio system and the parameters of the radio system in the context of electronic conflict. This technique is multi-criteria, in which the parameters are different in importance. The basis of this technique is the principle of nonlinear scheme of A. Voronin compromises. This technique allows to: – to synthesize the structure of the radio communication system in the conditions of electronic conflict; – to determine the optimal number of radio communication devices to ensure management tasks in the conditions of electronic conflict; – to substantiate a set of mechanisms to increase the noise immunity of the noise protection subsystem in the conditions of electronic conflict. The results of the research should be used at the stage of planning and operational management of the structure and parameters of military radio communication systems.

scholarly journals The improvement of method for the multi-criteria evaluation of the effectiveness of the control of the structure and parameters of interference protection of special-purpose radio communication systems

2021 ◽  
Vol 4 (2(60)) ◽  
pp. 22-27
Author(s):  
Anatolii Minochkin ◽  
Andrii Shyshatskyi ◽  
Vitalii Hasan ◽  
Anatolii Hasan ◽  
Andrii Opalak ◽  
...  
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Noise Immunity ◽  
Radio Resource Management ◽  
Interference Management ◽  
Radio Communication ◽  
Radio Electronic ◽  
Radio Systems ◽  
Radio Communication System ◽  
The Military

Military radio communication systems are the basis of special purpose control systems and the object of the enemy’s primary influence. Therefore, the issue of increasing the noise immunity of military radio communication systems is important and needs further research. Thus, the object of the research was chosen to be a military radio communication system. Maintaining a given level of noise immunity for military radio systems is one of the key issues in radio resource management, the effective management of which allows the use of the entire suitable frequency range for the transmission (reception) of electromagnetic energy by radio electronic devices. A number of works have been devoted to the ways search for increasing the noise immunity of military radio communication systems. One such way is to develop new (improve existing) approaches for assessing the effectiveness of military radio interference management. This work solves the problem of improving the method of multicriteria management effectiveness evaluation of the structure and parameters of the military radio systems noise protection. The scientific problem is solved by the devices of multicriteria estimation of the of noise protection level of the military radio communication system, graphic display of the executed and not executed tasks, the aggregation scheme of formation of the integrated estimation of noise protection. The research used scientific methods of analysis and synthesis, also the theory provisions of signal-code structures and the provisions of the complex technical systems theory. The peculiarity of the proposed improvement of the methodology is the multi-criteria assessment of the noise immunity level of the military radio communication system in the conditions of radio electronic conflict. The proposed technique allows: – to evaluate the effectiveness of noise protection management; – to substantiate the optimal configuration of the military radio communication system in solving the problems of noise protection management in the conditions of radio electronic conflict; – to identify the ways to increase noise immunity at the stage of operational management of the military radio communication system in the conditions of electronic conflict. The results of the research should be used in assessing the effectiveness of management of noise protection of military radio communication systems and determining the optimal structure and parameters of military radio systems.

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 Aplikasi Monitoring Energi SHS Off-Grid Menggunakan Lora

2021 ◽  
Vol 13 (1) ◽  
pp. 26-32
Author(s):  
Satrio Yudho
Keyword(s):  
Internet Of Things ◽  
Long Range ◽  
Spread Spectrum ◽  
Communication System ◽  
Electricity Consumption ◽  
Radio Communication ◽  
Energy Monitoring ◽  
Chirp Spread Spectrum ◽  
Solar Home System ◽  
Radio Communication System

The manner of efficiency and effective of power usage is the main objective in electricity consumption, one major steps to control the usage is by providing a monitoring to aim the power usage data and process it to information needed. Internet of Things benefit in power and electricity has involved sensors to work as data reader continuously.  LoRa or well known as Long Range radio communication system work with chirp spread spectrum which work from 920 to 923 Mhz in Indonesia. This paper presents implementation of LoRa system to support the prototype of energy monitoring in Solar Home System off-grid

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