{"title":"Features of emission and field electron spectroscopy of oxide thermocathode","authors":"V. Lobanov, E. Sheshin, N. N. Chadaev, S. Lobanov","doi":"10.30898/1684-1719.2023.4.6","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.6","url":null,"abstract":"The results of a study of the emission characteristics and gas release of oxide thermocathode by the method of time diagrams in the temperature range of 678÷885 °C and emission currents from 0.08 to 1.3 mA are presented, a directly proportional dependence of the partial pressures of the released gases CO and CO2 on the cathode emission current is established. The energy spectra of the emitted electrons of oxide thermocathode at a temperature of ~600 °C were measured, corresponding to the \"spotted cathode\" model. The dynamics of changes in the energy spectrum of the emitted electrons of the “spotted cathode” is presented, showing the existence of stages of activation, growth and deactivation of the emission of “spots” with an increase in the emission voltage.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131190833","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}
M. Zhumaev, M. Sharipov, V. Shavrov, V. Koledov, V. Scheglov, M. N. Rizokulov
{"title":"Nontrivial dynamics of spins under the action of mutually perpendicular constant and variable magnetic fields","authors":"M. Zhumaev, M. Sharipov, V. Shavrov, V. Koledov, V. Scheglov, M. N. Rizokulov","doi":"10.30898/1684-1719.2023.4.7","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.7","url":null,"abstract":"The paper considers the nontrivial dynamics of a spin when it is simultaneously affected by a constant magnetic field directed along the Z axis and a variable one applied to the XOY plane. It is shown that coupled oscillations of all components of the magnetic moment (or magnetization) arise in this case. In other words, it becomes possible to control the orientation of the magnetic moment. Further, it was found that this possibility remains even in the case of two constant magnetic fields – when they are perpendicular to each other. In the latter case, elliptical precessions of magnetic moments occur in planes perpendicular to the applied fields, the amplitudes of which can be changed by means of constant magnetic fields.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130073923","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":"Direction-of-arrival estimation algorithm in automotive distributed non-coherent multi-radar systems","authors":"I. Artyukhin, I. Averin, A. Flaksman, A. Rubtsov","doi":"10.30898/1684-1719.2023.4.2","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.2","url":null,"abstract":"The present paper is focused on processing of signals from multiple sensors in non-coherent mode that provide improvement of angular resolution of close targets compared to single radar. The low-complexity technique of Direction-of-Arrival (DoA) estimation in Automotive Distributed Non-Coherent Multi-Radar Systems in the case of short length of snapshots is proposed. This technique consists of three main stages: beam-scanning procedure, transformation of the received signals of two radars to the unified coordinate system, and joint DoA estimation algorithm. The DoA method is represented by two approaches: (i) the Capon method modified for joint signal processing; (ii) low-complexity algorithm based on theory of auto-compensator. Performance of the system is investigated on the base of Monte-Carlo simulation. Current algorithm shows improvement of system performance of distributed non-coherent multi-radar systems compared to single radar.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122105694","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":"ABOUT CALCULATION OF LUNAR GROUND RADIO BRIGHTNESS TEMPERATURE","authors":"O. Yushkova","doi":"10.30898/1684-1719.2023.4.5","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.5","url":null,"abstract":"Microwave radiometers have proven to be useful tools for studying the thermal regime of the atmosphere and the Earth's surface. Similar devices were recommended for inclusion in the composition of scientific radio equipment designed to study other bodies of the solar system, in particular the moon. The degree of understanding of the physical foundations of the experiments and the accuracy of their theoretical description is the coincidence of the results of measurements and numerical simulation of radio brightness temperature. The paper discusses the mechanism for calculating this value, deriving a recurrent formula convenient for calculating the radio brightness temperature from the Moon's soil. The algorithm is built for flat-layered soil. The depth distribution profile of physical temperature and complex permittivity for this problem are a priori information.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129620790","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 METHOD OF SYNTHESIS OF THE DIRECTION FINDING ALGORITHM OF THE PRODUCER OF COMBINED SIMULATING AND SELF-COVERING INTERFERENCE IN MONOPULSE PULSED-DOPLER TRACKING RADAR","authors":"I. V. Chigir, S. A. Gorhkov","doi":"10.30898/1684-1719.2023.4.4","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.4","url":null,"abstract":"For meters of angular coordinates of pulse-Doppler tracking radar of escort that implement the method of amplitude instantaneous comparison of radio signals, a methodology for the synthesis of the algorithm of the diversion of the combined imitating and masking jamming (CIM) has been developed. The calculation and comparative analysis of errors of evaluating the angular coordinates of the air target of the CIM-jamming when choosing as sources of veil information: retaliatory noise interference, which leads interference and the reflected air target signal.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129628941","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":"FEATURES OF A METALLIZED FABRIC APPLICATION FOR SHIELDING AN ANECHOIC CHAMBER","authors":"D. Skulachev, A. Kosov","doi":"10.30898/1684-1719.2023.4.1","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.1","url":null,"abstract":"Shielded anechoic chambers are widely used in testing electronic devices sensitive to external electromagnetic fields. The best shielding is provided by a closed metal screen of sufficient thickness. As a result, such devices are usually complex and heavy structures. If small-sized products are subjected to tests, it is possible to use simplified cameras, the screen of which is made of metallized fabric, and all equipment operates from an autonomous power supply source. An example of a simple technology for laying metallized fabric is given. It is indicated that when using such a fabric, the peculiarities of the electrodynamics of multilayer shielding should be taken into account.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125296042","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":"PROPAGATION OF A U-SHAPED RADIO PULSES IN A SELECTIVELY ABSORBING MEDIUM","authors":"A. Kulikova, N. Bukhman","doi":"10.30898/1684-1719.2023.4.8","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.4.8","url":null,"abstract":"General relationships are obtained that govern the evolution of a short signal propagating in a selectively absorbing medium. The propagation of a pulse with a rectangular envelope, the carrier frequency of which is close to the frequency of one of the spectral absorption lines of the medium, is considered. It is shown that in the case of a shift of the carrier frequency of the signal relative to the center of the spectral line, the interference of the primary signal and the response signal can lead to significant oscillations of the total signal in time. The amplitude of these oscillations decreases with increasing shift frequency.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133104712","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}
D. Klyukin, A. V. Demakov, A. A. Kvasnikov, A. Alhaj Hasan, S. Kuksenko
{"title":"On antenna feeding models for calculating its input impedance by the method of moments","authors":"D. Klyukin, A. V. Demakov, A. A. Kvasnikov, A. Alhaj Hasan, S. Kuksenko","doi":"10.30898/1684-1719.2023.3.5","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.3.5","url":null,"abstract":"In this study, we compared the effectiveness of various antenna excitation models for calculating the input impedance using the method of moments. A range of classical models and their combinations were analyzed and compared. The models were validated using two antennas and commercial simulation software. The models sensitivity to the discretization step of the antenna computational grid is also analyzed. he results of the study showed that the use of combined models is preferable for calculating input impedance, as they provide more accurate results.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124270474","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 the plane electromagnetic wave reflection from a inhomogeneous plasma layer covered of a perfectly conducting plane","authors":"O. Osipov, D. Panin","doi":"10.30898/1684-1719.2023.3.1","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.3.1","url":null,"abstract":"A method for numerical modelling of the reflection of an electromagnetic wave from a planar plasma layer with an inhomogeneous electron density of particles covered of an ideally conducting plane is proposed in the work. The frequency responses of wave reflection coefficients modules are calculated for various incidence angles and electron density profiles of carriers using the differential sweep method. The paper shows that in the region of plasma resonance the plasma layer with a parabolic profile of charge carrier concentration has the lowest reflection level. The effect of the effective frequency of electron collisions in an inhomogeneous plasma layer on the reflection level was studied in this work.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116263563","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":"FORMING A STRUCTURAL SCHEME OF RADIOOBMEN WITH A PRS","authors":"S. Abyshev","doi":"10.30898/1684-1719.2023.3.8","DOIUrl":"https://doi.org/10.30898/1684-1719.2023.3.8","url":null,"abstract":"The structure of the radio exchange demonstrates the interconnection pattern of the drones with the control center. To protect against unauthorized access to control and navigation channels it is necessary to hide such data and increase their noise immunity. The aim of the work is to use signals with a pseudorandom sequence and duplicate control and navigation blocks in the information channel of a small-scale aerial vehicle. Thus, at the beginning of the paper, a general structural diagram of radio communication between the unmanned aerial vehicle and the control center is presented. The model of 2-element antenna array consisting of two non-directional antenna elements is considered. On the basis of which it is possible to conclude about the signal arrival with a phase shift, taking into account which it is possible to determine the output signal of the array. An important factor is the synchronization and encryption of the signal. Data synchronization can be used by synchronous signal transmission between the drone and the control center. To reduce the probability of interception of the synchronous signal, the data packets containing it are transmitted in a pseudo-random sequence. Synchronization is achieved by using a micronavigation system through continuous radio transmissions from a ground source and simultaneous reception and recording of the signal on the drone. A one-time encryption or scrambler with a reversible symmetric transformation of the encoded information can be used as an encryption or scrambler. A random number generator is used to generate a sequence of random data, from which an array of key information tied to a specific period of use is created. The phase method can be used to process the signal. By measuring the phase shift with a phase detector, you can determine the location of the radio source with respect to the base normal. Measurements can be made with a digital receiving antenna array. Signal processing with digital receiving antenna array is performed by the diagramming device and the adaptive processor unit. As a result, all data using this approach is entered into the information block with the use of a pseudo-random coding change scheme, pseudo-random permutation of the navigation and control blocks.","PeriodicalId":391686,"journal":{"name":"Journal of Radio Electronics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121453097","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}