Phase Direction Finding Radio Engineering System

2021 ◽  
Author(s):  
Valentvn Bakhvalov ◽  
Genadiy Zhyrov ◽  
Rimvidas Khrashchevsky ◽  
Eugene Romanenko ◽  
Volodymyr Druzhynin
Keyword(s):  
Direction Finding ◽  
Engineering System ◽  
Radio Engineering ◽  
Phase Direction

scholarly journals Active impact on the ionosphere and variations of velocity characteristics of field-aligned irregularities

2020 ◽  
Vol 196 ◽  
pp. 02002
Author(s):  
Vladimir Sivokon
Keyword(s):  
Kamchatka Peninsula ◽  
Ionospheric Irregularities ◽  
Engineering System ◽  
Scattering Method ◽  
Engineering Systems ◽  
System Operation ◽  
Radio Engineering ◽  
Impact Area ◽  
The Impact ◽  
Field Aligned Irregularities

Ionospheric irregularities make significant impact on the efficiency of radio-engineering system operation. Our investigations carried out on Kamchatka peninsula showed that field-aligned irregularities have particularly destructive influence on decame-ter radars. We pin some definite expectations with them to increase the efficiency ofradio-engineering systems by active impact on the ionosphere. One of the important parameters of such irregularities is their velocity characteristics. When determining irregularity velocity in the impact area, different approaches are used, for example, aspect scattering method which specifies velocity on the whole but does not allow one to determine its vertical and horizontal components, direction of its motion. We have developed an ap-proach which allows us to solve this problem. As an example, results of observations over EISCAT experiments in October 2019 are presented.

scholarly journals Solenoid antenna of radio engineering system of metal identification

2019 ◽  
Vol 0 (1(83)) ◽  
pp. 188-196
Author(s):  
Антон Олексійович Абрамович ◽  
Володимир Олексійович Піддубний
Keyword(s):  
Engineering System ◽  
Radio Engineering

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 Synthesis of the optimal algorithm and structure of contactless optical device for estimating the parameters of statistically uneven surfaces

2021 ◽  
pp. 199-213
Author(s):  
Olexandr Shmatko ◽  
Valerii Volosyuk ◽  
Simeon Zhyla ◽  
Vladimir Pavlikov ◽  
Nikolay Ruzhentsev ◽  
...  
Keyword(s):  
Optimal Algorithm ◽  
Block Diagram ◽  
Optimal Estimation ◽  
Correlation Radius ◽  
Statistical Characteristics ◽  
Small Scale ◽  
Engineering System ◽  
Estimation Of Parameters ◽  
Radio Engineering ◽  
Accuracy Of Measurements

The production of parts and (or) finished products in electronics, mechanical engineering and other industries is inextricably linked with the control of the accuracy and cleanliness of the processed surfaces. Currently existing meters of parameters of statistically uneven surfaces, both contact and non-contact have some disadvantages, as well as limitations due to methods and design features of measurement. Speckle interferometric methods for measuring parameters of statistically uneven surfaces make it possible to get away from some disadvantages inherent in existing methods and measurements. The use of methods of statistical radio engineering, methods of optimization of statistical solutions and estimates of parameters of predictive distributions for optimal radio engineering system synthesis is promising for the analysis and processing optical-electronic coherent laser space-time signals (speckle images) form with the laser radiation scattered by statistically uneven surfaces. This work synthesizes the optimal algorithm and structure for analyzing the parameters of statistically-temporal surfaces based on spatio-temporal processing of optical speckle interference signals and images using modern methods of optimal synthesis of radio engineering and coherent optoelectronic systems. In this work, an algorithm for processing optical signals scattered by statistically uneven surfaces is synthesized and investigated for problems of optimal estimation of parameters and statistical characteristics of statistically uneven surfaces. A block diagram of the optical contactless device for evaluating the parameters of statistically uneven surfaces is proposed. The limiting errors of estimation parameters of statistically uneven surfaces and the optimal installation angles of the emitters and the optical receiver are investigated. Equations are obtained for estimating the root-mean-square height of the ridges and the correlation radius of small-scale statistically uneven surfaces in the approximation of small perturbations. The proposed method for evaluating the parameters of statistically uneven surfaces allows to increase the accuracy of measurements, to conduct a non-contact assessment of the parameters - even statistically uneven surfaces that have geometric surface irregularities or located in hard-to-reach places, for example, grooves, holes, as well as products of cylindrical, spherical and other shapes.

Sign in / Sign up

Export Citation Format

Share Document