Journal of Radio Electronics最新文献

{"title":"Selecting the time dependence of the accelerating voltage fluctuations for modeling of the spectral characteristics of a megawatt-level gyrotron","authors":"R. Rozental, A. P. Fokin","doi":"10.30898/1684-1719.2024.2.8","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.8","url":null,"abstract":"The spectral characteristics of the gyrotron with a megawatt power level in the 170 GHz range were modeled numerically. The calculations were carried out using the large particle method implemented in the KARAT code. The problem of three-dimensional modeling of the excitation of an asymmetric type mode was reduced to a 2.5-dimensional one. For this model, the presence of high-frequency fluctuations at the output of high-voltage power supplies, which determine the initial energy of electrons, was taken into account. The relationship between the shape and width of the radiation spectrum of the simulated gyrotron and the time dependence of the accelerating voltage has been studied. It is shown that the best agreement with experimental data is obtained by combining a relatively slow sawtooth change in particle energy with fast random fluctuations.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"231 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140468526","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":"Stabilizing regenerator characteristics","authors":"А.S. Matsaev","doi":"10.30898/1684-1719.2024.2.3","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.3","url":null,"abstract":"The article relates to the field of research of the physics of the transition of the amplifier from the aggregate state of amplification to the aggregate state of generation. The aim of the study is to find the possibility of controlling the process of transition from one state of aggregation to another, to implement a stable retention of the device at a given point. The latter will make it possible to implement the construction of stable regenerators. A theoretical conclusion is obtained about the possibility of stable signal regeneration, for which the stabilization coefficient of negative feedback on a constant, zero component should be greater than the regeneration coefficient or gain in gain due to positive feedback at the maximum gain frequency, and for a resonant amplifier – at a resonant frequency. The information confirming the theoretical conclusions and conditions on the example of some technical solutions and implementations of practical devices is given. The multiple technical advantages of stable regenerators over traditional amplifying devices are demonstrated, including resistance to excitation of parasitic generation in a wide dynamic range and temperature range. This is explained by the fact that a stable regenerator cannot be excited twice, a stable excitation is a normal state of aggregation of the regeneration of the input signal. There is also a significant increase in sensitivity and, accordingly, a decrease in intrinsic noise by 9-10 orders of magnitude, an improvement in the width of the linear dynamic range by 8-9 orders of magnitude. An improvement in the amplified frequency bandwidth is demonstrated, not only in the area of minimization, but also in the region of significant expansion, more than an order of magnitude, relative to the maximum achievable for specific samples of the amplifying element, the transistor. The fact that the dependence of the regeneration coefficient and the quality factor of the LC circuit is a special case, only for LC regenerators, is shown and explained. The presented broadband regenerators use strip valves or broadband transformers without an LC circuit and have a regeneration coefficient, which does not contradict the theory and is useful in practice. Multiple improvements are predicted in the construction of systems and devices for low-power signals, as well as an improvement by several orders of magnitude of the main technical characteristics of communication and location systems, measuring systems and devices.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"492 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140469214","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":"Utilizing software-defined radio for structural analysis of energy-intensive substances using nuclear magnetic resonance","authors":"V.V. Kiyashchenko, A.A. Akopyan, S.YU. Ganigin, E.S. Zhuravleva","doi":"10.30898/1684-1719.2024.2.7","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.7","url":null,"abstract":"This article discusses the creation of a system using software-defined radio for the study of energy-intensive substances using nuclear magnetic resonance. Software-defined radio (SDR) uses technology that allows to configure or change the parameters of radio frequency operation through software, such as frequency range, modulation type and output power. The article presents the structure of the system and provides a detailed analysis of several key components. The proposed approach involves the use of a SDR transmitter-receiver, which is a universal device capable of both transmitting and receiving signals. The article describes the stages of signal processing and suggests potential directions for the development of the system in the future. By using the SDR architecture and software interface, the system achieves a close location between sampling, digital-to-analog and analog-to-digital conversions, minimizing noise and distortion created by the analog part of the spectrometer. The SDR allows the use of quadrature modulation and demodulation, digital filtering and amplification, as well as software adjustment of filter characteristics. The article highlights the problems associated with the development of such NMR systems. The advantages of the system include enhanced capabilities for the development of new spectroscopic methods, compact dimensions for easy portability and cost-effectiveness compared to commercial spectrometers.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"89 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140463954","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 evaluating reflective characteristics of objects based on multi-focal probing fields","authors":"E.S. Emel’yanov","doi":"10.30898/1684-1719.2024.2.4","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.4","url":null,"abstract":"The possibility of using special (multi-focus) fields for solving problems related to the experimental evaluation of the reflective characteristics of objects has been considered. Regularities in the formation of multi-focus fields in three-dimensional cases have been specified. The advantages of the proposed approach have been demonstrated in terms of flexible adjustment of signal processing algorithms based on digital signal filtering methods. This ensures obtaining radar characteristics of objects, considering the peculiarities of constructing single-position, bi-static, and multi-static location systems.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"131 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140469980","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":"Journal of Radio Electronics","authors":"A. Leontyev, V.E. Nechaev, E. Semenov, O. Plankin, R. Rozental","doi":"10.30898/1684-1719.2024.2.5","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.5","url":null,"abstract":"Gyrotrons based on relativistic electron flows generated by thermionic magnetron injection guns are promising pulsed sources of millimeter and submillimeter radiation with multi-megawatt output power. Obviously, to increase the output power of such devices, it is necessary to provide a high beam current of more than 100 A. At the selected emission density, this forces the use of an emitter with a sufficiently large area. As is well known, wide emitters produce beams with a large velocity spread, which reduces the efficiency of the electron-wave interaction. Therefore, it is necessary to increase the diameter and, accordingly, increase the distance from the cathode to the gyrotron cavity, which leads to an increase in the magnetization reversal coefficient. Thus, the magnetic field in the region of beam formation becomes weak, and the Larmor radius and the turn pitch of the electron trajectory become large compared to the geometry of the surrounding electrodes, which can cause nonadiabatic effects. In this work, we consider one of these effects, which consists in the emergence of a range of anode voltage values in which the monotonic growth of the pitch factor stops. The results of trajectory analysis using current tube and discrete source methods based on the ANGEL software package are presented, as well as an assessment of the influence of a magnetic lens on the properties of an electron beam based on a simple analytical model.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"230 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140468868","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":"A transceiver module for an active phased array antenna of a small spacecraft","authors":"A.P. Paneeva, E.V. Komissarova","doi":"10.30898/1684-1719.2024.2.12","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.12","url":null,"abstract":"The transceiver modules of various manufacturers are considered, the analysis of systems for ensuring the thermal regime of these modules is presented. The modern principles of construction of receiving and transmitting modules of active phased antenna arrays are formulated. Based on the analysis, the appearance of the transceiver module for the X-band active phased array antenna of the radar surveillance spacecraft is presented.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"43 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140463269","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 pulse in a selectively amplifying medium","authors":"A. Kulikova, N. Bukhman","doi":"10.30898/1684-1719.2024.2.2","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.2.2","url":null,"abstract":"General relations are obtained that govern the evolution of the leading edge of a signal propagating in a selectively amplifying 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 amplification lines of a selective (in frequency) amplifying medium, is considered. The time dependence of the envelope of the initially rectangular signal is studied for various values of the optical thickness of the substance layer for the Gaussian and Lorentzian contours of the spectral line. 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 and amplified signal can lead to very significant oscillations of the total signal in time.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"356 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140468255","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":"Application of phase-code shift keyed probing signals with zero autocorrelation zone to improve the quality of measurements in SAR","authors":"R. Ipanov, A.A. Komarov","doi":"10.30898/1684-1719.2024.1.11","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.11","url":null,"abstract":"For SARs, a polyphase (p-phase, where p is a prime number) probing signal with a zero autocorrelation zone has been synthesized, which is a train of p phase-code shift keyed (PCSK) pulses coded by complementary sequences of a p-ary D-code with additional phase-code shift-keying of the sub-pulses (discretes) of pulses by an M-sequences. To assess the quality of radar images of point targets and extended surfaces, the levels of the maximum side lobe and one-way integrated correlation noise of the autocorrelation function (ACF) are used, respectively. For this purpose, the work carried out a comparative analysis of the total ACFs of the synthesized ensemble of signals with ensembles of orthogonal chirp and PCSK-signals used in adjacent SAR sounding cycles. The work also considers the problem of superimposition of SAR echo signals from different ranges at a relatively high repetition rate of probing pulses. To assess the level of suppression of recurrent interference from point targets and from extended surfaces, the levels of the maximum side lobe and one-sided integral correlation noise of the cross-correlation function (CCF) are used, respectively. For this purpose, the work carried out a comparative analysis of the total CCFs of the synthesized ensemble of signals with ensembles of orthogonal chirp and PCSK- signals used in the SAR aperture synthesis modes. The use of orthogonal chirp and PCSK-signals makes it possible to successfully suppress false signals from bright point targets from adjacent repetition periods. However, the high level of integral correlation noise of the CCF of orthogonal signals distorts radar images of weakly reflecting surfaces located next to bright extended objects. The indicators of the total correlation characteristics of the synthesized ensemble of signals exceed the corresponding indicators of the total correlation characteristics of the ensemble of orthogonal PCSK-and chirp signals, both without mismatch and with Doppler frequency mismatch. This makes it possible to successfully use an PCSK-signal with a zero autocorrelation zone to improve the quality of radar images and suppress recurrent range interference in SAR.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140515963","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":"Operation regimes switching of erbium fibre lasers","authors":"A. M. Smirnov, A. V. Dorofeenko, O. Butov","doi":"10.30898/1684-1719.2024.1.12","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.12","url":null,"abstract":"Operation features of the erbium fiber lasers with short cavities near two phase transitions have been established experimentally for the first time. The power-law behavior of the system parameters in the vicinity of the critical point in a wide range of pump power values was revealed. The parameters and operation regimes dependence on the cavity length and pump power, namely the switching from pulsed to CW operation, was investigated. The pulse duration and frequency dependencies with varying cavity length have been investigated, which made it possible to experimentally establish the universal dependence of these parameters on the lasing power for passively Q-switched erbium fiber lasers. The critical indices for pulsed operation of the erbium fiber lasers are determined weakly depending on the cavity parameters. The results of the study can be used for designing high-coherent fiber laser sources.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"90 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140517164","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":"Study of electromagnetic field characteristics at errors of focusing phase distributions","authors":"O. V. Potapova, Y. Sedelnikov","doi":"10.30898/1684-1719.2024.1.10","DOIUrl":"https://doi.org/10.30898/1684-1719.2024.1.10","url":null,"abstract":"Influence of errors of realization of phase distributions of radiating currents on efficiency of focused field formation in microwave technologies is investigated in paper. Quantitative estimates were obtained to assess the decrease of antenna directivity and the degree of electromagnetic field defocusing depending on the value of mean square deviation and the depth of the focus point location. As media in which the electromagnetic field was formed, the free space and wet loam were investigated in the work.","PeriodicalId":508283,"journal":{"name":"Journal of Radio Electronics","volume":"323 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140521309","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}