Pub Date : 2022-06-30DOI: 10.17212/1727-2769-2022-2-60-69
Denis A. Yuzvik, M. Stepanov
The problem of synthesizing a film attenuator made by applying an absorbing material to a conductor is considered. Since the absorbing material has a parameter of maximum dissipated power per unit area, then when synthesizing an attenuator to attenuate high powers, the problem of exceeding the maximum dissipated power per unit area may arise. A sectional attenuator structure has been proposed, which is a set of sections having different attenuation to reduce the power dissipated per unit area. An algorithm for the synthesis of a sectional attenuator is proposed. The attenuator sections are rectangles of various widths. The attenuation distribution is performed using the Taylor series expansion of mathematical functions. The properties of the functions used to distribute the attenuation related to the problem under consideration were considered. The graphs of the dependence of power on the attenuator section are presented. Power distribution has been confirmed by simulation results. Theoretical calculations were confirmed by simulation results in the CST Microwave Studio software.
{"title":"An algorithm for synthesis of a film attenuator with uniform power dissipation along its length","authors":"Denis A. Yuzvik, M. Stepanov","doi":"10.17212/1727-2769-2022-2-60-69","DOIUrl":"https://doi.org/10.17212/1727-2769-2022-2-60-69","url":null,"abstract":"The problem of synthesizing a film attenuator made by applying an absorbing material to a conductor is considered. Since the absorbing material has a parameter of maximum dissipated power per unit area, then when synthesizing an attenuator to attenuate high powers, the problem of exceeding the maximum dissipated power per unit area may arise. A sectional attenuator structure has been proposed, which is a set of sections having different attenuation to reduce the power dissipated per unit area. An algorithm for the synthesis of a sectional attenuator is proposed. The attenuator sections are rectangles of various widths. The attenuation distribution is performed using the Taylor series expansion of mathematical functions. The properties of the functions used to distribute the attenuation related to the problem under consideration were considered. The graphs of the dependence of power on the attenuator section are presented. Power distribution has been confirmed by simulation results. Theoretical calculations were confirmed by simulation results in the CST Microwave Studio software.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116864428","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}
Pub Date : 2022-06-30DOI: 10.17212/1727-2769-2022-2-46-59
N. S. Khailo, A. V. Krivetsky, A. G. Vostretsov
The study aims at synthesizing an asymptotically robust invariant demodulation algorithm for DPSK signals with arbitrary modulation multiplicity used in aircraft communication systems and observed against the background of noise with an unknown probability distribution and a noise complex with a priori uncertain parameters. The analysis of the efficiency of the proposed algorithm is carried out by a computer simulation modeling. The algorithm implies automatic detection and rejection of narrowband pulse noise. This type of interference is typical for radio-navigation systems. It has been shown that the narrowband pulse noise should be eliminated if the signal-to-interference ratio becomes less than -10 dB. The use of the asymptotic robustness principle ensures the stability of the algorithm characteristics to changes in the character of the noise probability distribution density. It was found that the joint application of narrowband pulse interference elimination and the asymptotically robust approach provides reliable demodulation performance both when receiving against the background Gaussian noise and under the action of pulse interference and noise with "heavy tails". In addition, it has been shown that the use of signals with differential phase modulation, direct sequence spread spectrum, and the sidelobe levels of less than 10% effectively suppresses interference caused by multipath signal propagation.
{"title":"An asymptotically robust invariant algorithm for demodulation of DPSK signals under external interference with a priori uncertain parameters","authors":"N. S. Khailo, A. V. Krivetsky, A. G. Vostretsov","doi":"10.17212/1727-2769-2022-2-46-59","DOIUrl":"https://doi.org/10.17212/1727-2769-2022-2-46-59","url":null,"abstract":"The study aims at synthesizing an asymptotically robust invariant demodulation algorithm for DPSK signals with arbitrary modulation multiplicity used in aircraft communication systems and observed against the background of noise with an unknown probability distribution and a noise complex with a priori uncertain parameters. The analysis of the efficiency of the proposed algorithm is carried out by a computer simulation modeling. The algorithm implies automatic detection and rejection of narrowband pulse noise. This type of interference is typical for radio-navigation systems. It has been shown that the narrowband pulse noise should be eliminated if the signal-to-interference ratio becomes less than -10 dB. The use of the asymptotic robustness principle ensures the stability of the algorithm characteristics to changes in the character of the noise probability distribution density. It was found that the joint application of narrowband pulse interference elimination and the asymptotically robust approach provides reliable demodulation performance both when receiving against the background Gaussian noise and under the action of pulse interference and noise with \"heavy tails\". In addition, it has been shown that the use of signals with differential phase modulation, direct sequence spread spectrum, and the sidelobe levels of less than 10% effectively suppresses interference caused by multipath signal propagation.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125957654","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}
Pub Date : 2022-06-30DOI: 10.17212/1727-2769-2022-2-36-45
A. A. Slobodyanenko
In the article, the problems of determining and monitoring antenna parameters, solved using measurements in the near field, are presented in a unified formulation corresponding to the gene-ralized inverse radiation problem in the form of an integral equation of the first kind. Within the framework of the numerical approach to the solution, the equation is discretized, and then the solution is sought approximately as a solution to the normal system of equations. It is shown that an approximate solution to the discretized problem that satisfies the normal system is also a solution to an equation with an orthogonal projector on its right-hand side. On the basis of this formulation, a new method of iterative projections is proposed. The efficiency of the method is demonstrated by the example of solving the problem of reconstructing the radiation pattern of a horn antenna from near-field data calculated for the electrodynamic model of the antenna in the HFSS program. The results of the proposed method are compared with the results of solving the problem by the method of decomposition in singular numbers.
{"title":"A projection method for solving discretezed inverse problems for antenna measurements","authors":"A. A. Slobodyanenko","doi":"10.17212/1727-2769-2022-2-36-45","DOIUrl":"https://doi.org/10.17212/1727-2769-2022-2-36-45","url":null,"abstract":"In the article, the problems of determining and monitoring antenna parameters, solved using measurements in the near field, are presented in a unified formulation corresponding to the gene-ralized inverse radiation problem in the form of an integral equation of the first kind. Within the framework of the numerical approach to the solution, the equation is discretized, and then the solution is sought approximately as a solution to the normal system of equations. It is shown that an approximate solution to the discretized problem that satisfies the normal system is also a solution to an equation with an orthogonal projector on its right-hand side. On the basis of this formulation, a new method of iterative projections is proposed. The efficiency of the method is demonstrated by the example of solving the problem of reconstructing the radiation pattern of a horn antenna from near-field data calculated for the electrodynamic model of the antenna in the HFSS program. The results of the proposed method are compared with the results of solving the problem by the method of decomposition in singular numbers.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115338451","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}
Pub Date : 2022-06-30DOI: 10.17212/1727-2769-2022-2-20-35
L. Neyman, V. Neyman, A. Markov, S. Lappi
The research performed is actual because it is necessary to improve methods of calculations of rapid dynamic processes in electrical units. The object of research is the construction of a two-mass technological vibration unit with electromagnetic excitation. The subject of research is the method of calculation based on the created simulation model of the vibration unit dynamic cha-racteristics in transient and stationary modes with respect to a form and frequency of the source voltage. The mathematical model is based on non-linear differential equations of the electrical and mechanical balance. The main objective of research is the development of a simulation model of a two-mass technological vibration unit with electromagnetic excitation using modern methods of computer simulation. The example of the numerical implementation of the mathematical model by structural modeling methods in the Matlab Simulink is considered and the computer model of the electromagnetic vibration unit is created. The examples of the calculation of dynamical cha-racteristics of electromagnetic vibration unit for the analysis of electromechanical processes in transient and stationary modes are presented. Some of calculated values of integral indicators describing conversion processes of electric energy consumed from a power supply are given. The proposed simulation model of a technological vibration unit can be used to calculate rapid dyna-mic processes in different modes to provide a rational choice of vibration unit parameters when it is designed. The model is also useful for the analysis and synthesis of automatic systems to control the supplied voltage amplitude, frequency and form. The results of the research can be of particular interest to specialists in the area of machine strength dynamics and vibration protection.
{"title":"Development of an imitation model of a two-mass technological vibratory unit with electromagnetic excitation","authors":"L. Neyman, V. Neyman, A. Markov, S. Lappi","doi":"10.17212/1727-2769-2022-2-20-35","DOIUrl":"https://doi.org/10.17212/1727-2769-2022-2-20-35","url":null,"abstract":"The research performed is actual because it is necessary to improve methods of calculations of rapid dynamic processes in electrical units. The object of research is the construction of a two-mass technological vibration unit with electromagnetic excitation. The subject of research is the method of calculation based on the created simulation model of the vibration unit dynamic cha-racteristics in transient and stationary modes with respect to a form and frequency of the source voltage. The mathematical model is based on non-linear differential equations of the electrical and mechanical balance. The main objective of research is the development of a simulation model of a two-mass technological vibration unit with electromagnetic excitation using modern methods of computer simulation. The example of the numerical implementation of the mathematical model by structural modeling methods in the Matlab Simulink is considered and the computer model of the electromagnetic vibration unit is created. The examples of the calculation of dynamical cha-racteristics of electromagnetic vibration unit for the analysis of electromechanical processes in transient and stationary modes are presented. Some of calculated values of integral indicators describing conversion processes of electric energy consumed from a power supply are given. The proposed simulation model of a technological vibration unit can be used to calculate rapid dyna-mic processes in different modes to provide a rational choice of vibration unit parameters when it is designed. The model is also useful for the analysis and synthesis of automatic systems to control the supplied voltage amplitude, frequency and form. The results of the research can be of particular interest to specialists in the area of machine strength dynamics and vibration protection.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"45 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133758472","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}
Pub Date : 2021-12-27DOI: 10.17212/1727-2769-2021-4-36-48
N. V. Protsenko, B. Malozyomov, J. V. Dmitrieva, S. Kuznetsov
The development of environmentally friendly transport is given priority by all the leading cities in the world. Electric transport is the most important aspect of the transport system of a modern metropolis, one of the main tools for maintaining sustainable population mobility and high living standards. Highly efficient charging stations are one of the most important factors in the commercial success of electric vehicles. The development and installation of fast charging stations will be an important step towards the development of the electric vehicles use. The development of technologies aimed at alternative energy sources, including for use in transport, is gaining popularity both for research in this area and for patenting on the territory of the Russian Federation. A review of patent documents filed with the Patent Office of the Russian Federation and related to inventions in the field of electric transport is carried out. The analysis of technical solutions of inventions and utility models aimed at the development of a charging infrastructure, the creation of an intelligent power supply system for express charging of electric vehicles based on lithium-ion energy storage devices, as well as related promising areas for the development of the industry. An attractive investment climate in the Russian Federation and the stimulation of the development of the charging infrastructure by the state is shown, which can give an impetus to inventive activity in the segment of charging stations and electric vehicles.
{"title":"The need to identify and patent promising solutions in the field of electric transport","authors":"N. V. Protsenko, B. Malozyomov, J. V. Dmitrieva, S. Kuznetsov","doi":"10.17212/1727-2769-2021-4-36-48","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-4-36-48","url":null,"abstract":"The development of environmentally friendly transport is given priority by all the leading cities in the world. Electric transport is the most important aspect of the transport system of a modern metropolis, one of the main tools for maintaining sustainable population mobility and high living standards. Highly efficient charging stations are one of the most important factors in the commercial success of electric vehicles. The development and installation of fast charging stations will be an important step towards the development of the electric vehicles use. The development of technologies aimed at alternative energy sources, including for use in transport, is gaining popularity both for research in this area and for patenting on the territory of the Russian Federation. A review of patent documents filed with the Patent Office of the Russian Federation and related to inventions in the field of electric transport is carried out. The analysis of technical solutions of inventions and utility models aimed at the development of a charging infrastructure, the creation of an intelligent power supply system for express charging of electric vehicles based on lithium-ion energy storage devices, as well as related promising areas for the development of the industry. An attractive investment climate in the Russian Federation and the stimulation of the development of the charging infrastructure by the state is shown, which can give an impetus to inventive activity in the segment of charging stations and electric vehicles.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130619297","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}
Pub Date : 2021-12-27DOI: 10.17212/1727-2769-2021-4-15-25
Igor V. Buzuk, A. V. Krivetsky, Vasiliy A. Renteev
The point of the study – to determine the demand for the development of devices, methods and algorithms for performing precision measurements in various fields of technology and a scientific experiment on the activity of their registration as forms of intellectual property. The dynamics of the number of applications filed with the Federal Institute of Industrial Property and the dynamics of published titles of protection in the field of precision measurements are considered, and an analysis of the distribution of published titles of protection by classes of the International Patent Classification is presented. Among other things, the analysis of patents allows you to evaluate ways to reduce the error of precision solutions. The scientific novelty of the research lies in the use of statistics on patenting the existing technical solutions in the field of precision measurements as a justification for the relevance of creating new solutions. As a result, a steady intensity of precision solutions patenting was determined, indicating the relevance of work in this area. Analysis of methods for reducing errors of precision meters indicates the relevance of methods for reducing the noise levels of primary measuring transducers.
{"title":"Analysis of the patent activity of Russian developers in the field of precision measurement technology","authors":"Igor V. Buzuk, A. V. Krivetsky, Vasiliy A. Renteev","doi":"10.17212/1727-2769-2021-4-15-25","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-4-15-25","url":null,"abstract":"The point of the study – to determine the demand for the development of devices, methods and algorithms for performing precision measurements in various fields of technology and a scientific experiment on the activity of their registration as forms of intellectual property. The dynamics of the number of applications filed with the Federal Institute of Industrial Property and the dynamics of published titles of protection in the field of precision measurements are considered, and an analysis of the distribution of published titles of protection by classes of the International Patent Classification is presented. Among other things, the analysis of patents allows you to evaluate ways to reduce the error of precision solutions. The scientific novelty of the research lies in the use of statistics on patenting the existing technical solutions in the field of precision measurements as a justification for the relevance of creating new solutions. As a result, a steady intensity of precision solutions patenting was determined, indicating the relevance of work in this area. Analysis of methods for reducing errors of precision meters indicates the relevance of methods for reducing the noise levels of primary measuring transducers.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134485835","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}
Pub Date : 2021-12-27DOI: 10.17212/1727-2769-2021-4-7-14
N. Orlova, M. Kurkin
The loss of stability of the antiferromagnetic state of matter respective to the Peierls transition is calculated in the framework of a new model of magnetic sublattices. In this new model, in contrast to the Anderson-Ziman sublattice model, the antiferromagnetic spin ordering is provided by a weak influence of magnetic anisotropy. Magnetic anisotropy suppresses exchange mixing with a sufficiently large number of spins in the sublattice . The Peierls transition consists in the deformation in a linear chain of atoms, namely the convergence of neighboring atoms, at which the period of the crystal lattice increases by factor of two. When atoms approach, exchange interaction is established between a pair of nearest atomic spins only. Based on the new model of magnetic sublattices, the antiferromagnetic sublattice state of the periodic chain of spins is found to be unstable respective to the transition to the Peierls state. During the transition to the "spin-Peierls" state, the spins of neighboring atoms will be ordered antiparallelly, but since there is no preferred direction of spin ordering, it is impossible to introduce the concept of magnetic sublattices. Such magnetic states can be suggested from the exponential dependence of the magnetic susceptibility on the reciprocal temperature. The electrons magnetism in this state is determined by the atomic diamagnetism if the frequencies of thermal motion are small compared to the exchange frequency.
{"title":"Peierles transition in a linear chain of exchange related spins","authors":"N. Orlova, M. Kurkin","doi":"10.17212/1727-2769-2021-4-7-14","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-4-7-14","url":null,"abstract":"The loss of stability of the antiferromagnetic state of matter respective to the Peierls transition is calculated in the framework of a new model of magnetic sublattices. In this new model, in contrast to the Anderson-Ziman sublattice model, the antiferromagnetic spin ordering is provided by a weak influence of magnetic anisotropy. Magnetic anisotropy suppresses exchange mixing with a sufficiently large number of spins in the sublattice . The Peierls transition consists in the deformation in a linear chain of atoms, namely the convergence of neighboring atoms, at which the period of the crystal lattice increases by factor of two. When atoms approach, exchange interaction is established between a pair of nearest atomic spins only. Based on the new model of magnetic sublattices, the antiferromagnetic sublattice state of the periodic chain of spins is found to be unstable respective to the transition to the Peierls state. During the transition to the \"spin-Peierls\" state, the spins of neighboring atoms will be ordered antiparallelly, but since there is no preferred direction of spin ordering, it is impossible to introduce the concept of magnetic sublattices. Such magnetic states can be suggested from the exponential dependence of the magnetic susceptibility on the reciprocal temperature. The electrons magnetism in this state is determined by the atomic diamagnetism if the frequencies of thermal motion are small compared to the exchange frequency.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129488777","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}
Pub Date : 2021-12-27DOI: 10.17212/1727-2769-2021-4-49-61
A. Shevchenko, Tatiana V. Chestyunina, D. Toporkov, G. B. Vyaltsev
The paper presents design features of motors with electromagnetic reduction of rotation frequency with switched magnetization. The harmonic composition of the magnetic field of such motors is considered when using fractional slot windings. Analytical expressions for the magnetomotive force of the winding are given and data on operating harmonics for reluctance motors and motors with switched magnetization at different numbers of phases are presented. The principle of operation of such machines is described. The method of harmonic permeances was used to calculate the magnetic field in the air gap. As a result, analytical expressions were obtained for the distribution of the magnetic field in the air gap and the electromagnetic torque. After analy¬zing the expressions obtained, the paper presents the conditions under which the formation of an electromagnetic torque occurs. The design and the operation principle of motors with electromagnetic reduction of rotation frequency with switched magnetization is described and compared visually with reluctance motors. It illustrates a better use of the active volume in machines with switched magnetization. In addition, a comparison between motors with switched magnetization and classical electric machines (synchronous, induction and direct current machines) in terms of the utilization of an active volume factor for different power values is given.
{"title":"Motors with electromagnetic reduction of rotation frequency with switched magnetization","authors":"A. Shevchenko, Tatiana V. Chestyunina, D. Toporkov, G. B. Vyaltsev","doi":"10.17212/1727-2769-2021-4-49-61","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-4-49-61","url":null,"abstract":"The paper presents design features of motors with electromagnetic reduction of rotation frequency with switched magnetization. The harmonic composition of the magnetic field of such motors is considered when using fractional slot windings. Analytical expressions for the magnetomotive force of the winding are given and data on operating harmonics for reluctance motors and motors with switched magnetization at different numbers of phases are presented. The principle of operation of such machines is described. The method of harmonic permeances was used to calculate the magnetic field in the air gap. As a result, analytical expressions were obtained for the distribution of the magnetic field in the air gap and the electromagnetic torque. After analy¬zing the expressions obtained, the paper presents the conditions under which the formation of an electromagnetic torque occurs. The design and the operation principle of motors with electromagnetic reduction of rotation frequency with switched magnetization is described and compared visually with reluctance motors. It illustrates a better use of the active volume in machines with switched magnetization. In addition, a comparison between motors with switched magnetization and classical electric machines (synchronous, induction and direct current machines) in terms of the utilization of an active volume factor for different power values is given.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121732932","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}
Pub Date : 2021-12-27DOI: 10.17212/1727-2769-2021-4-26-35
A. Zakhlebin
The article presents a method for photogrammetric processing of aerial photographs from a DJI Phantom 4 Pro UAV with a geodetic receiver on board. The processing method allows building digital terrain models with an accuracy of 0.1 m.
{"title":"A method of processing aerial photography materials for building a georeferenced orthomosaic of the terrain from a television camera of the unmanned aerial vehicle DJI Phantom 4 PRO","authors":"A. Zakhlebin","doi":"10.17212/1727-2769-2021-4-26-35","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-4-26-35","url":null,"abstract":"The article presents a method for photogrammetric processing of aerial photographs from a DJI Phantom 4 Pro UAV with a geodetic receiver on board. The processing method allows building digital terrain models with an accuracy of 0.1 m.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117168460","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}
Pub Date : 2021-10-29DOI: 10.17212/1727-2769-2021-3-32-43
Alexsandr S. Mitkov, V. Razinkin, V. Khrustalev
The paper describes the design principles of multi-element broadband microwave attenuators of a high power level on film resistors. The proposed approaches make it possible to increase the input power level by several times or, at a constant input power, to significantly expand the ope¬rating frequency band. The studied attenuators with an insertion loss of 1-10 dB provide high-quality matching in the 0-2 GHz frequency band at an input power level of up to 500 W. These parameters are obtained by introducing quarter-wave sections of transmission lines with a certain wave imped-ance into the longitudinal and transverse branches of matched U-shaped and T-shaped dissipative structures.
{"title":"Methods of increasing the input power level in multi-element film microwave attenuators","authors":"Alexsandr S. Mitkov, V. Razinkin, V. Khrustalev","doi":"10.17212/1727-2769-2021-3-32-43","DOIUrl":"https://doi.org/10.17212/1727-2769-2021-3-32-43","url":null,"abstract":"The paper describes the design principles of multi-element broadband microwave attenuators of a high power level on film resistors. The proposed approaches make it possible to increase the input power level by several times or, at a constant input power, to significantly expand the ope¬rating frequency band. The studied attenuators with an insertion loss of 1-10 dB provide high-quality matching in the 0-2 GHz frequency band at an input power level of up to 500 W. These parameters are obtained by introducing quarter-wave sections of transmission lines with a certain wave imped-ance into the longitudinal and transverse branches of matched U-shaped and T-shaped dissipative structures.","PeriodicalId":448354,"journal":{"name":"Proceedings of the Russian higher school Academy of sciences","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124138733","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}
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