Achievements of Modern Radioelectronics最新文献

{"title":"Method for structural and functional synthesis of aviation multifunctional simulators","authors":"L. Mistrov, E. Shepovalov","doi":"10.18127/j20700784-202105-02","DOIUrl":"https://doi.org/10.18127/j20700784-202105-02","url":null,"abstract":"A method of structural and functional synthesis of aviation multifunctional simulators (AMT) is proposed for training aircraft crews according to the criterion of solving a certain set of educational tasks (US) in order to form a system-technical concept of their construction and determine the main visual parameters. The physical and mathematical formulation of the synthesis of the appearance (composition of hardware and software (APS), technical characteristics and functioning algorithms) of AMT on a set of conditions and constraints is given, which implements a conceptual model of substantiating its optimal version in the form of a control, in-formationsupporting and executive (as part of the APS ) subsystems in the field of admissible solutions of the functional, structural and parametric aspects of synthesis. A descriptive model of the use of AMT is substantiated in the form of a logically structured hierarchical system of typical elementary, simple, complex and target situations at the levels of elementary technological operations, individual, aggregate and aggregate of program components with a model representation of elementary fragments of subtasks, subtasks, one and a system of educational tasks, respectively. The construction of the model is carried out on the basis of invariant immersion in the nomenclature and structure of the US and the selection using the structural and functional analysis of the set of structured elements of typical situations on the set of recognition signs at the characteristic (nodal) points of the trajectories of the flight mission (US) by the aircraft crew. In accordance with this structured AMT mod-el, a hierarchical system of methods, models and techniques for assessing and substantiating the preferred appearance of AMT has been developed in terms of information, information-system and system performance indicators at the stages of analysis and synthesis. The basis of the efficiency of the generated AMT variants is structured functional tasks of the qualitative and quantitative assessment of the heterogeneous resource of the AMT and taking into account their interrelationships at different levels of research. When synthesizing the AMT appearance, the problem is solved on the basis of the optimal distribution of the APS resource when implementing an external system control function and an intrasystem transition function while providing an adaptive solution to a set and one US, respectively. The AMT synthesis trajectory includes an algorithmic sequence of hierarchical levels of research coordinated according to decision-making criteria, corresponding to aspects of organizational, functional, structural and parametric synthesis and is presented in the form of an algorithmic research scheme that implements a multi-level sequential process of evaluating the effectiveness of generated variants of its appearance and choosing the optimal option for certain conditions and restrictions. The method is based on the prov","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123831734","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":"23Na MRI on 0,5T clinical scanner","authors":"N. Anisimov, A. A. Tarasova, O. Pavlova, D. Fomina, I. Usanov, A. Makurenkov, G. Pavlovskaya, Y. Pirogov","doi":"10.18127/j20700784-202104-02","DOIUrl":"https://doi.org/10.18127/j20700784-202104-02","url":null,"abstract":"Object. The purpose of this work is to reveal the possibilities of low-field 23Na MRI. It was supposed to obtain images of various human organs using the 3D-scanning method, and to do this with minimal hardware modifications of a typical clinical 0,5T scanner. Materials and methods. The proprietary receiving coils, originally intended for registering proton signals (21,1 MHz), were transformed to transceiver ones and tuned to the sodium Larmor frequency of 5,6 MHz. The scanning was carried out by the 3D-gradient echo method with the parameters: TR/TE=44,7/12 ms, FA=45° and isotropic resolution of 6 mm. To increase SNR, apodization in k-space was applied during data processing. Results. 23Na MRI (including volumetric reconstructions) of several human organs – head, breast, heart, joints were obtained with SNR up to 15. Discussion. When developing low-field 23Na MRI, it is advisable to focus on recording only the T2long component (>15 ms). In this case, it is possible to narrow the receiver bandwidth as much as possible and thereby minimize noise. In addition, the requirements for the transmission path are reduced. As a result, for debugging MRI methods, the equipment of a typical clinical scanner, which is supplemented by coils tuned to the sodium NMR frequency only, can be used.","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124301313","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":"Overview of CIoT technologies: features and sequence of device operation","authors":"A. Stepanov","doi":"10.18127/j20700784-202212-12","DOIUrl":"https://doi.org/10.18127/j20700784-202212-12","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126257519","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":"Incoherent and coherent accumulation of the spectra of a burst of LFM-pulses over the intervals of Doppler ambiguity","authors":"V. Chapursky, M. I. Noniashvili, A. Vodolazov","doi":"10.18127/j20700784-202103-04","DOIUrl":"https://doi.org/10.18127/j20700784-202103-04","url":null,"abstract":"In advanced portable radars using the principles of MIMO, obtaining a high resolution and a sufficient S/N ratio is important due to the use of a reduced number of widely directed transmitting and receiving antenna elements, for example, sub lattices with low directional coefficients. In such radars, probing signals in the form of burst of broadband LFM pulses are applicable. When processing these signals reflected from moving targets, two methods are fundamentally possible: classical one in the time domain with matched filtering of the burst of LFM-pulses and subsequent inter-period accumulation, and the spectral one based on preliminary calculation of the full spectrum of the pulses burst with subsequent accumulation over the frequency intervals of Doppler ambiguity. In this case, there are two options for the accumulation of spectra: 1) incoherent and 2) coherent, and their efficiency for a burst of LFM-pulses has not been studied before. In this work on the simulation model of the processing system in the spectral domain the output S/N ratios for these variants of the spectral processing method for a burst of LFM-pulses are determined and compared. In addition, the issues of presenting the results of spectral accumulation in the coordinates «Doppler frequency – delay» plane were worked out. The following results are obtained for a specific variant of the burst signal: the efficiency of coherent spectrum accumulation under the influence of noise exceeds the efficiency of incoherent by a value of about 12 dB; in the case of incoherent accumulation of spectrum modules in the case of a group targets, the accumulated amplitude spectrum, with a sufficient duration of the pulses burst, contains all the Doppler-resoluted target marks; in the case of coherent accumulation of complex spectra of group targets with different Doppler frequencies and ranges, the targets can be resolved based on the analysis of the module of the accumulated complex spectrum in the «Doppler frequency – range» plane; 4) with incoherent and coherent of spectral accumulation over ambiguous Doppler intervals, a single FFT of a LFM-pulses burst is required. The remaining operations are the algebraic summation of the spectral samples over the ambiguity intervals and taking the modulus from the accumulated complex spectrum.","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126023565","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":"Trajectory control methods for observation in two-position angular airborne radio monitoring systems Part 1. Orthogonal methods","authors":"V. I. Merkulov, D. Milyakov, V. P. Khar’kov, V. Chernov","doi":"10.18127/j20700784-202103-01","DOIUrl":"https://doi.org/10.18127/j20700784-202103-01","url":null,"abstract":"Formulation of the problem. Currently, much attention is paid to the practical application and further improvement of two-position goniometric systems (TPGS) airborne radio monitoring, the advantage of which over single-position systems is the possibility of almost instantaneous determination of the location of the radio emission source (RES). A feature of the operation of the TPGS is the dependence of the errors in the positioning of the RES on the «geometry» of the system, i.e. on the size of the base and the position of the RES relative to the base. That is why the problem of optimizing the mutual arrangement of the receiving positions and RES is very urgent. To minimize positioning errors, two groups of trajectory observation control (TOC) methods have been developed, which is due to the variety of conditions for the practical use of aviation goniometric two-position systems and different degrees of their effectiveness. The first group of methods, called orthogonal, provides control of the receiving positions placed on the aircraft, so that the lines of sight of the RES relative to them intersect at right angles. The formation of a right-angled triangulation triangle, at the vertices of which the aircraft and RES are located, can be ensured by appropriate movement of the information support aircraft, or by simultaneously pointing both aircraft. In the first case, it is envisaged to output the information aircraft to an arbitrary point of a straight line, orthogonal to the line of sight «leading aircraft-RES», during the flight along which the best conditions for observation are created, or to a given point on this line. The second group of TOC methods ensures the minimization of errors in the positioning of radioactive sources at each current moment of time. When developing the corresponding trajectory control algorithms that implement the indicated trajectory control methods, direct and indirect optimization methods were used. To date, various TOC methods have been developed, but there is no systematic presentation of them. Purpose. To give a systematized idea of the developed methods of trajectory control of observation in two-position goniometric systems for radio monitoring of the surrounding space, as well as ways of solving the problem of ensuring the best observation conditions and increasing the accuracy of estimating the phase coordinates of the RES in these systems. Results. In the first part of this article, orthogonal methods and algorithms of TOC are considered, the implementation of which contributes to a significant increase in the accuracy of estimating the coordinates of the RES in goniometric two-position airborne radio monitoring systems. Information on the results of experimental studies confirming the effectiveness of the developed TOC methods is also given. Practical significance. The areas of practical application of various TOC methods in solving radio monitoring problems are shown, information about which can be used ","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131374086","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":"Radio-electronic control systems of sixth generation fighters. Part 2. Architecture of the onboard complex. Features of integration and element base","authors":"A. Bogachev, V. I. Merkulov, A. N. Savelyev, I. R. Zagrebelnyi","doi":"10.18127/j20700784-202209-01","DOIUrl":"https://doi.org/10.18127/j20700784-202209-01","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121865949","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":"Dual-frequency combined phased array antenna operating in L- and S-bands","authors":"E. V. Manaenkov, Alexander L. Gusev, S. Terekhin, S. A. Zhuravlev, O. V. Terekhin","doi":"10.18127/j20700784-202211-01","DOIUrl":"https://doi.org/10.18127/j20700784-202211-01","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"297 1‐2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120847538","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":"Mathematical model of functional reliability of avionics, taking into account their predicted technical condition","authors":"K.P. Masjukov, D. Konovalov","doi":"10.18127/j20700784-202210-03","DOIUrl":"https://doi.org/10.18127/j20700784-202210-03","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116444906","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":"Computer simulation of the Lange directional coupler with maximum possible frequency overlap","authors":"M.R. Kirillova, Yuliya V. Raevskaya, V.A. Redkina, T. S. Ryzhakova","doi":"10.18127/j20700784-202210-07","DOIUrl":"https://doi.org/10.18127/j20700784-202210-07","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127515730","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":"Improvement of the energy characteristics of a tropospheric communication modem","authors":"P. Luferchik, А.V. Luferchik, R. G. Galeev, Е.V. Bogatyrev, P. V. Shtro","doi":"10.18127/j20700784-202205-04","DOIUrl":"https://doi.org/10.18127/j20700784-202205-04","url":null,"abstract":"","PeriodicalId":151965,"journal":{"name":"Achievements of Modern Radioelectronics","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133986125","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}