Journal of Radio Electronics最新文献

{"title":"The calculation algorithm of sublattise magnetizations in two-sublattice ferrimagnet with compensation point. Part 1. Phase diagram","authors":"D. Suslov, V. Shavrov, V. Shcheglov","doi":"10.30898/1684-1719.2024.5.2","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.5.2","url":null,"abstract":"The calculation algorithm of sublattice magnetizations in two-lattice ferromagnet with compensation point is proposed. On the basis of preceding works review it is put the task about calculation of sublattices in individuality. It is investigated the general scheme of whole ferrimagnet magnetization forming which contains two magnetic sublattices both connected by exchange interaction. In geometry of axis symmetry along constant field direction it is investigated the orientational dependence of sublattices magnetization from applied field. It is found the forming conditions of anti-parallel and parallel collinear phases and corner phase between its. It is proposed the model presentation of magnetization dependence from temperature which contain the degree index dependence of general temperature to Curie temperature relation for each sublattice individual. For the simplicity and clear appearance of presentation the power index was choose. It is established the conditions which are necessary for forming the temperature compensation point. It is found the dependencies of deflection corners of each sublattices magnetization from field direction in accounting the given temperature. The decision of proposed excitation for magnetic field allows to find the boundaries of sublattice system transition between phases. On the basis of proposed temperature dependencies of critical transition fields it is drawing the phase diagram of two-sublattice ferrimagnet. It is found two settled on field one above other branches. The lower branch correspond to anti-parallel phase and upper branch correspond to parallel phase. It is found that lower branch contain sufficient quantity of information for to determine the individual both sublattice magnetization. It is proposed the methodic for calculation the individual sublattice magnetization based on the character temperature values and summary magnetizations. On the lower branch marked four character points which correspond to four temperatures and two values of summary magnetization. With using these points it is founded the equation system which allows to determinate the individual magnetizations values. It is proposed some recommendations for further development of investigations.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"52 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141031584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Digital radio receiver based on neural network","authors":"A.D. Yukhmanov, A.V. Mishurov, A.I. Konovalenko, V. Evstratko","doi":"10.30898/1684-1719.2024.1.5","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.5","url":null,"abstract":"One of the areas of digital signal processing used in radio receivers and currently being investigated is the use of artificial neural networks. Signal reception is one of the most difficult theoretical and engineering problems in message transmission. The difficulty lies in the fact that messages need to be extracted from modulated signals, which are exposed to various distorting factors and interference in the radio channel. Therefore, it is desirable to have methods of reception that would be the best (optimal) in the given conditions. There are many different neural network topologies. Single–layer and multi-layer direct propagation are known – perceptrons, recurrent networks, self-organizing networks, as well as hybrid networks (radial-basis, hierarchical classifiers). Each of these types of topologies has its own advantages and disadvantages.The article analyzes current research and development in this area. The implementation of a radio receiver (demodulator) based on a multilayer perceptron is shown and the neural network is trained. Using National Instruments PXI equipment, a study was carried out, which showed that in comparison with an optimal receiver, the probability of a bit error in a receiver based on a neural network is higher, but insignificant. The operation of the receiver under the influence of harmonic interference showed that as the power of the interference increases, the probability of a BER error increases, and the closer the interference is to the carrier frequency, the higher the BER also becomes. Nevertheless, the neural network-based digital receiver under study remains operational at significant levels of interference that are close enough to the carrier frequency of the desired signal.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"294 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139635925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of the evaporation duct uncertainty on the tropospheric radio wave propagation","authors":"M. Lytaev","doi":"10.30898/1684-1719.2024.1.4","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.4","url":null,"abstract":"This study is dedicated to the radio wave propagation modeling in the evaporation duct. Special attention is given to the fact that the parameters of tropospheric waveguides are practically always determined with some degree of error. An algorithm based on the parabolic equation method has been developed, which takes into account the measurement error of the tropospheric refractive index and assesses the statistical characteristics of the spatial distribution of radio wave amplitude. A series of numerical experiments have been conducted for various propagation conditions. It has been demonstrated that in many cases, ignoring the refractive index error can lead to significant discrepancies in simulation results.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"35 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139635675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure and element base of the transceiver module for organizing an underwater wireless optical data transmission system","authors":"I.B. Shirokov, V.V. Golovin, E. Redkina, I. Serdyuk, P.P. Ovcharov","doi":"10.30898/1684-1719.2024.1.7","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.7","url":null,"abstract":"In the paper, the results of theoretical study of a wireless optical data transmission channel, as well as experimental study of its characteristics, taking into account different configurations of the optical component base of receiving and transmitting modules, were presented. The model of the wireless underwater optical communication channel with pulse-position modulation (4 bits per symbol) of digital data traffic with 100 Mbps is proposed. The model showed that to organize a communication channel on a 10 m path, the use of an array of light-emitting diodes (LEDs) is requires (the amount is up to 20 LEDs). For this case, a sufficiently large route budget will be provided, even with additional factor that reduce the efficiency of light propagation in seawater. The LEDs were chosen to organize the data transmission channel, since they have a wide radiation pattern and allow the implementation of a relatively simple driver circuit. The required optical radiation power is realized with the use of an array of LEDs. Schematic diagrams of the LEDs driver and power supply for the receiving and transmitting modules have been designed. A measuring layout with optical transmitter and receiver blocks has been implemented. The test signal is a regular sequence of pulses with a duty cycle of 2, and a frequency of 1 MHz. In the receiving module, the signal from the output of the pin photodiode is amplified using a wideband operational amplifier. Sets of 3 pin photodiodes and 10 LEDs were selected and tests were carried out to determine options for optical components that provide the best time characteristics of the output electrical signal in terms of delay time, rising and falling edges of pulses in a wireless optical airborne communication channel. Also, measurements were done on an air path with a length of 0.25-3 m using one or two LEDs as part of the transmitting module. It has been experimentally confirmed that the organization of a communication channel with a length of up to 10 m requires about 15-20 light-emitting diodes. Further study involves the designing and testing of a driver for the LEDs array and a prototype transceiver module.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"80 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139639830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wide band dual-polarized antenna array of planar dipoles for base stations of mobile communication","authors":"K. Kobrin, Z. Li, V. Sledkov, M. Manuilov","doi":"10.30898/1684-1719.2024.1.6","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.6","url":null,"abstract":"A novel wideband modification of the base station antennas for mobile communication based on crossed planar dipoles is proposed for operation within frequency band 1.4-2.7 GHz. The operational frequency band of the suggested design of crossed dipoles was extended due to optimization of the profile of dipole arms approximated by means of Bezier curves of third order. The fine tuning of the mutual coupling of the crossed dipoles is achieved by optimization of the arms profile which yields the extension of the frequency band with high impedance matching and port isolation of antenna. The Bezier curves parameters were used as the optimization parameters. The characteristics of single antenna as well as 8-element array of crossed dipoles are studied in detail. The obtained characteristics of antenna array meet to the main requirements for base station antennas. Reflection coefficient within operational frequency band about octave is less than -14…-15 dB, ports isolation is -25 dB, cross polarization component is less than -17.5 dB. The antenna has the stable radiation pattern within operational frequency band the beam width for the level -10 dB in horizontal plane is equal to 120°+18°/-7°.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"19 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139631706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The problem of detecting abnormal waves on water by navigation radar. 2. The solution of the radiolocation equation","authors":"V. A. Permyakov, A. Baskakov, M. S. Mikhailov, S. Permiakov","doi":"10.30898/1684-1719.2024.1.8","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.8","url":null,"abstract":"Simple options for the effective scattering area of anomalous waves are considered in the geometric optics approximation for two types of targets: a single wave and a white wall. The radar equation has been solved to find the maximum radar range for such targets, taking into account the influence of significant wave heights on the effective scattering area of anomalous waves and taking into account interference due to the scattering of electromagnetic waves on sea waves. Conditions are proposed for the lifetime and height of anomalous waves necessary for observing these waves with standard ship radars.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"116 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139639647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Method of space debris element recognition from optical and radar images based on neural network technologies","authors":"O.A. Mishukov, A.N. Smirnov, A.E. Zhitikhin","doi":"10.30898/1684-1719.2024.1.3","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.3","url":null,"abstract":"An improved Bayesian method is presented for recognising space debris elements from optical and radar images and is intended to identify potentially hazardous space debris elements for operational spacecraft. A set of informative features for recognising space debris elements is proposed. A modified Bayesian classifier based on a deep neural network with a sequential decision-making procedure is considered as a decisive rule. The quality requirements for the used optical and radar images are defined. The results of recognition probability estimation for different types of space debris elements with different number of used optical and radar images are obtained.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"329 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139632307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of accuracy of frequency synchronization algorithms for satellite communication system based on DVB-S2 signal","authors":"S.A. Levichev, K. Iansitov, S.V. Dorokhin, A. Dvorkovich","doi":"10.30898/1684-1719.2023.12.23","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.12.23","url":null,"abstract":"The paper investigates the schemes of frequency synchronization of signal reception of satellite communication system based on DVB-S2 standard with different combinations of coarse and fine frequency synchronization algorithms, namely, the following pairs of algorithms are considered: «Edge band» and «Delay & Multiply», «Delay & Multiply» and «L&R», «Edge band» and «L&R», where the first algorithm in each pair performs the task of coarse and the second algorithm performs the task of fine frequency synchronization. The accuracy of the investigated frequency synchronization schemes is evaluated using the Root Mean Square Error (RMSE) metric of frequency offset estimation in the channel. In addition, one of the performance metrics of the algorithm is the estimation of synchronization time. The frequency shift in the signal transmission channel is set constant and equal to 20% of the signal bandwidth. Using combinations of Non-Data-Aided (blind) algorithms for coarse frequency shift estimation and Data-Aided algorithms for fine frequency synchronization, the synchronization time can be reduced by almost a factor of 2, while maintaining high accuracy of RMS estimation.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"7 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139189195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromagnetic analysis of infinite 2D antenna array with random parameters","authors":"S. Bankov","doi":"10.30898/1684-1719.2023.12.19","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.12.19","url":null,"abstract":"The method of electromagnetic analysis of infinite two-dimensional antenna array with random parameters is proposed. The method uses compensating sources technique and method of generalized scattering matrix which allow one to analyze infinite non-uniform antenna arrays containing defects of the periodical structure in form of array elements with random parameters. The proposed method takes into account influence of random parameter variation relatively its average value in linear approximation. Expressions for the dispersion of the array parameters are obtained in frame of the proposed method.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"8 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139190711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of algorithms for preliminary frequency synchronization in a satellite communication receiver in the conditions of a non-geostationary orbit of a spacecraft","authors":"A. M. Bibikov, I.E Leonov","doi":"10.30898/1684-1719.2023.12.24","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.12.24","url":null,"abstract":"The work is devoted to a comparative study of various algorithms for compensating for frequency shift in a single-frequency radio channel under conditions of varying Doppler frequency shift. The resulting characteristics of frequency offset compensation algorithms based on the Fitz method and the least squares method were studied. Using the method of numerical experiment, the accuracy characteristics of the operation of the studied algorithms in situations of constant and changing frequency shifts were obtained. The best accuracy characteristics of the algorithm based on the Fitz method were revealed in comparison with those built on the basis of the least squares method. At the same time, the algorithm based on the least squares method showed satisfactory accuracy characteristics of operation under conditions of changing frequency shift, under which the algorithm based on the Fitz method turns out to be ineffective.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"61 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139195814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}