scholarly journals EXPERIMENTAL RESULTS OF SOFTWARE ALGORITHMIC SYNCHRONIZATION OF DISTRIBUTED RADIO SYSTEM WITH MOBILE CARRIERS

2019 ◽  
pp. 44-52
Author(s):  
I. V. Kryuchkov ◽  
M. I. Noniashvili ◽  
A. I. Skachkova ◽  
A. A. Filatov
Keyword(s):  
Phase Synchronization ◽  
Reference Signal ◽  
Spatial Diversity ◽  
Engineering System ◽  
Technical Solution ◽  
Crystal Oscillator ◽  
Radio System ◽  
Radio Engineering ◽  
Synchronization Errors ◽  
Algorithmic Technique

Introduction. One of the classes of modern radio engineering systems are systems with spatial diversity of transmitting, receiving or transceiving elements. In such systems, an increase of the information content is achieved by signal coprocessing ensuring synchronization in time and phase of the carrier oscillation. Currently, the researchers do not pay enough attention to the requirements for the accuracy of synchronization of distributed systems of different applications, as well as simple and affordable ways to synchronize them.Objective. The paper main objective is the search for technical solutions for clock and phase synchronization without atomic frequency standards and external sources of coordinate-time information.Methods and materials. The paper considers a distributed radio engineering system with non-rigid structure. Each element of the system has reference signal from its own crystal oscillator. The oscillators are not physically aligned. The phases of their oscillations are periodically compared by the method of two-way transmission of synchronizing signals (from one element to another and vice versa). The synchronization technique (software algorithmic approach) is reduced to the coprocessing signal correction according to estimated frequency (phase) drifts. The testing of the proposed technical solution is presented on a hardware model consisting of ten receiving and transmitting modules.Results. The experiment showed that RMS of synchronization errors does not exceeded 12 degrees by phase (for VHF), or 0.2 ns by time. These results are acquired for spatial diversity up to several hundred meters, mutual speed of the modules up to several meters per second and may be extended for higher frequencies (in particular, UHF).Conclusion. The paper proposes a method of multilateral propagation to synchronize distributed radioengineering systems. Combined with software algorithmic technique this method enables to obtain synchronization accuracy in real-time sufficient for coherent diversity technique.

scholarly journals Estimation of the synchronization error for spaced-apart ground points of satellite communication

2021 ◽  
Vol 5 (2) ◽  
pp. 102-109
Author(s):  
R. B. Kovalev ◽  
V. V. Kornienko ◽  
V. N. Ratushnak
Keyword(s):  
Satellite Communication ◽  
Time Synchronization ◽  
Reference Signal ◽  
Signal Propagation ◽  
Satellite Communications ◽  
Propagation Time ◽  
Engineering System ◽  
Mutual Synchronization ◽  
Ongoing Research ◽  
Mutual Correlation

A significant number of patents and publications in the open press show the intensity of the ongoing research to create new methods of synchronization and specialized ground-based equipment for frequency-time synchronization. The article considers the implementation of an autonomous synchronization system between ground-based satellite communication points, which is used in conditions of unfavorable reception or absence of signals from global navigation satellite systems. The paper presents studies on the assessment of the error of time synchronization of geographically separated ground points of satellite communications. The basics of constructing the receiving equipment of a radio engineering system are considered and the mutual correlation of the reference signal of the receiving equipment and the received input synchronization signal is calculated. The results of field tests of mutual synchronization equipment are presented, where the potential synchronization accuracy of equipment at ground objects with previously unknown coordinates was determined, while the synchronization equipment provided measurement of the signal propagation time from one ground object to another with the formation of universal time scales on points. The method of mutual synchronization of linked points is carried out by the duplex method at a frequency of 1065 MHz (request) and 625 MHz (response) by phase-code-manipulated signals with a base equal to 1023 and a duration of 0,1 ms.

COLUMBUS OF RADIO ENGINEERING. TO THE 125TH ANNIVERSARY OF RADIO INVENTION. PART II

2020 ◽  
Author(s):  
Н.А. БОРИСОВА
Keyword(s):  
Comparative Analysis ◽  
Wireless Communication ◽  
Technical Solution ◽  
Radio Engineering ◽  
The Core ◽  
125Th Anniversary ◽  
Communication Scheme

Приведены доказательства того, что изобретение, публично продемонстрированное русским ученым-физиком А.С. Поповым 7 мая 1895 г., положило начало беспроводной связи. Рассмотрены следующие вопросы: что произошло в эту знаменательную дату; на чьих работах базировался Попов, создавая схему беспроводной связи. Показаны сущность и новизна технического решения. Опровергается ошибочное мнение о том, что 25 апреля (7 мая) 1895 г. А.С. Попов официально представил грозоотметчик. Для сравнительной оценки вклада Попова и его предшественников в изобретение радио использован синергетический подход; кроме того, возникновение и развитие радиосвязи представлены в виде последовательности этапов инновационного процесса. В условиях, когда национальные интересы и общий скепсис в отношении того, что у радио есть изо -бретатель, привели к появлению понятий «коллективный разум», «пионеры радиосвязи», и их список с годами растет (в наши дни во многих странах есть «свой Попов»), популяризация научно обоснованных сведений о Попове как о первооткрывателе радио - Колумбе радиотехники приобретает особую важность. The article presents the evidence that the invention, publicly demonstrated by the Russian physicist A.S. Popov on May 7 (new style), 1895, marked the beginning of wireless communication. The following questions are discussed. What happened on that date? On whose works Popov was based, creating a wireless communication scheme? The core and novelty of the technical solution are described. A misconception that on May 7, 1895, A.S. Popov publicly presented the lightning detector is disputed. For a comparative analysis of Popov’s and predecessors’ contribution to the radio invention a synergetic approach is used.

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