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On Anderson Localization of Quasi-Optical Wave Beams 准光光束的安德森局域化
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-05-13 DOI: 10.1007/s11141-025-10381-8
V. A. Mironov, D. A. Fadeev
{"title":"On Anderson Localization of Quasi-Optical Wave Beams","authors":"V. A. Mironov,&nbsp;D. A. Fadeev","doi":"10.1007/s11141-025-10381-8","DOIUrl":"10.1007/s11141-025-10381-8","url":null,"abstract":"<p>We study analytically the statistical (Anderson) localization of the wave beam propagating in a structure of evenly placed waveguides with random parameters. We explore in detail the suppression of the diffraction broadening of the wave field in a randomly inhomogeneous medium in the continuum limit. A dispersion equation for the mean field is obtained from statistical averaging of the Helmholtz equation. The structure of the dispersion equation considerably differs from the parabolic dispersion law (typical of homogeneous media in the quasioptical approximation). The surface of the wave vectors defined by this equation (the refractive-index surface) has points where the curvature changes sign. In the theory of wave processes, this indicates that the diffraction is suppressed for the wave beams propagating in the so-called special directions in space, which corresponds to the Anderson localization. Evolution of such wave beams is considered on the basis of presenting the field as the Fourier integral of the spectrum of initial distribution over the transverse wave number. The asymptotic evaluation of the integral shows that the Anderson localization is described by the Airy beams. The transition region is studied numerically. Similar conclusions are also drawn in the case of a discrete problem.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 5","pages":"387 - 395"},"PeriodicalIF":0.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Fractional Calculus for Modeling the Dynamic Behavior of Structures Under Moving Loads: A Review 分数阶微积分在移动荷载作用下结构动力特性建模中的应用综述
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-05-13 DOI: 10.1007/s11141-025-10382-7
M. V. Shitikova, A. I. Krusser
{"title":"Application of Fractional Calculus for Modeling the Dynamic Behavior of Structures Under Moving Loads: A Review","authors":"M. V. Shitikova,&nbsp;A. I. Krusser","doi":"10.1007/s11141-025-10382-7","DOIUrl":"10.1007/s11141-025-10382-7","url":null,"abstract":"<p>This review presents a state-of-the-art analysis in the field of application of fractional calculus to dynamic problems in solid mechanics with moving loads. It includes papers devoted to the study of the dynamic behavior of structures carrying moving loads and made of a viscoelastic material and/or resting on viscoelastic foundations, the damping properties of which are described by models with fractional derivatives. A large number of numerical and experimental studies in this field gives grounds for using fractional-derivative models in dynamic contact problems. Issues on the action of moving oscillating loads in the form of systems with one or several degrees of freedom are also considered.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 5","pages":"396 - 411"},"PeriodicalIF":0.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection of Signal-Like Interference Based on the Analysis of Eigenvalues of the Sample Correlation Matrix 基于样本相关矩阵特征值分析的类信号干扰检测
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-05-13 DOI: 10.1007/s11141-025-10383-6
O. E.Kudryashova, E. S. Fitasov
{"title":"Detection of Signal-Like Interference Based on the Analysis of Eigenvalues of the Sample Correlation Matrix","authors":"O. E.Kudryashova,&nbsp;E. S. Fitasov","doi":"10.1007/s11141-025-10383-6","DOIUrl":"10.1007/s11141-025-10383-6","url":null,"abstract":"<p>We obtain an analytical expression for the decision statistics for detecting signal-like active interference based on an estimate of the eigenvalues of a sample correlation matrix. The exact decision statistic is derived from a rigorous expression for the likelihood ratio and obtained on the basis of the generalized likelihood ratio including that for short samples. Using the exact decision statistic, we obtain detection curves (the dependence of the probability of correct detection on the signal-to-noise ratio) for various process-sample lengths. Dependences of the probability of correct detection on the phase-fluctuation value are given and it is shown that signal-to-noise ratio for detecting the signal-like interference in the case of a given probability of correct detection significantly increases with decreasing phase fluctuations of the interference.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 5","pages":"412 - 421"},"PeriodicalIF":0.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Scattering of Long-Wavelength Radiation by Two Parallel Cylinders 两个平行圆柱体对长波辐射的散射
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-05-13 DOI: 10.1007/s11141-025-10380-9
A. E. Verevkin, A. S. Bereza, D. A. Shapiro
{"title":"Scattering of Long-Wavelength Radiation by Two Parallel Cylinders","authors":"A. E. Verevkin,&nbsp;A. S. Bereza,&nbsp;D. A. Shapiro","doi":"10.1007/s11141-025-10380-9","DOIUrl":"10.1007/s11141-025-10380-9","url":null,"abstract":"<p>We consider the scattering of long-wavelength radiation by two parallel cylinders within the framework of the quasistatic approximation, which is valid when the diameters of the cylinders and the gap between them are much smaller than the radiation wavelength. Using the conformal transformation, we obtain an analytical solution to the two-dimensional problem, which agrees well with the computer calculations. The found Green’s function allows calculating higher expansion orders.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 5","pages":"374 - 386"},"PeriodicalIF":0.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interaction of Relativistic Electrons with Finite-Length Packets of Electromagnetic Ion-Cyclotron Waves in the Earth’s Magnetosphere 地球磁层中相对论电子与有限长度的电磁离子回旋波包的相互作用
IF 0.7 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-05-13 DOI: 10.1007/s11141-025-10378-3
V. S. Grach, A. G. Demekhov
{"title":"Interaction of Relativistic Electrons with Finite-Length Packets of Electromagnetic Ion-Cyclotron Waves in the Earth’s Magnetosphere","authors":"V. S. Grach,&nbsp;A. G. Demekhov","doi":"10.1007/s11141-025-10378-3","DOIUrl":"10.1007/s11141-025-10378-3","url":null,"abstract":"<p>We consider the interaction of relativistic electrons with finite-length packets of electromagnetic ion-cyclotron waves in the Earth’s radiation belts. On the basis of the numerical simulation by the test particle method, we study the dependence of the interaction characteristics on the length and amplitude of the wave packet both in the linear and nonlinear regimes. The fluxes of the particles precipitating to the loss cone as a result of the considered interaction are calculated. We show that both in the linear regime and under the regime of force bunching caused by the direct influence of the Lorentz force on the electron phase, the decrease in the packet length expands the interaction region to low energies outside the range of resonance values for the central packet component. Such an interaction can lead to precipitation of hundreds-keV electrons into the ionosphere. Nonlinear effects lead to saturation of the precipitation flux at the limiting level corresponding to the strong pitch-angle diffusion.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 5","pages":"347 - 365"},"PeriodicalIF":0.7,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Behavior of the Refractive Index of Ultrashort Waves in the Lower 10-m Atmospheric Layer Over the Ivolginsk Basin 伊沃尔金斯克盆地低层10 m超短波折射率的变化
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-04-17 DOI: 10.1007/s11141-025-10376-5
A. S. Bazarova, A. V. Bazarov, S. A. Kurakov, E. B. Atutov, Yu. B. Bashkuev
{"title":"Behavior of the Refractive Index of Ultrashort Waves in the Lower 10-m Atmospheric Layer Over the Ivolginsk Basin","authors":"A. S. Bazarova,&nbsp;A. V. Bazarov,&nbsp;S. A. Kurakov,&nbsp;E. B. Atutov,&nbsp;Yu. B. Bashkuev","doi":"10.1007/s11141-025-10376-5","DOIUrl":"10.1007/s11141-025-10376-5","url":null,"abstract":"<p>We present the results of studying the refractive index of ultrashort waves, which is calculated on the basis of meteorological measurements of the atmospheric-soil measuring complex. The diurnal and seasonal dynamics of the behavior of the refractive index and its gradient in the lower 10- meter layer of the troposphere in the Ivolginsk basin in the Republic of Buryatia are considered. It is found that in summer, meteorological conditions that favor the negative refraction of UHF waves arise. It determined that the greatest influence on the general gradient of the refractive index in this season is exerted by the gradient of its humidity component, which depends on the vertical distribution of atmospheric humidity. Due to intense insolation, the Earth’s surface is heated, which leads to active evaporation of the soil moisture and its subsequent condensation in the atmosphere.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 4","pages":"326 - 336"},"PeriodicalIF":0.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rough Statistics in Radio Measurements: Randomization of Uninformative Signal Parameters 无线电测量中的粗略统计：无信息信号参数的随机化
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-04-17 DOI: 10.1007/s11141-025-10377-4
Yu. N. Gorbunov
{"title":"Rough Statistics in Radio Measurements: Randomization of Uninformative Signal Parameters","authors":"Yu. N. Gorbunov","doi":"10.1007/s11141-025-10377-4","DOIUrl":"10.1007/s11141-025-10377-4","url":null,"abstract":"<p>This paper analyses the problems of measuring the parameters of a repetitive periodic signal with the monobit (binary 1/0 or signed binary ±1) quantization, which is called “rough statistics” here. The consideration is carried out in relation to radio equipment with phased antenna arrays using spatiotemporal sampling. The system constructed is based on the Monte Carlo method. Randomization of noninformative parameters of the processed signals is used for linearization of the quantization nonlinearity. This paper brings into balance the conventional approach based on an extensive increase in resources (that is, an increase in the resolution and rate of the analogto-digital converter) and the alternative approach involving an increase in the sample size.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 4","pages":"337 - 345"},"PeriodicalIF":0.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radar Probing of the Moon on the Sura Facility: Anomalous Enhancement of the Radio Echo During the Session On October 17, 2022 Sura设施上的月球雷达探测：2022年10月17日会议期间无线电回波的异常增强
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-04-17 DOI: 10.1007/s11141-025-10372-9
A. V. Shindin, Yu. V. Tokarev, K. K. Grekhneva, Yu. I. Belov
{"title":"Radar Probing of the Moon on the Sura Facility: Anomalous Enhancement of the Radio Echo During the Session On October 17, 2022","authors":"A. V. Shindin,&nbsp;Yu. V. Tokarev,&nbsp;K. K. Grekhneva,&nbsp;Yu. I. Belov","doi":"10.1007/s11141-025-10372-9","DOIUrl":"10.1007/s11141-025-10372-9","url":null,"abstract":"<p>We present the results of radar experiments performed on the Sura facility after its upgrade in 2020–2021. Anomalous enhancement of the radio echo up to 40 dB above the radio background level during a lunar radar session on October 17, 2022 at a frequency of 8925 kHz is reported. Arguments in favor of the ionospheric nature of this phenomenon are presented.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 4","pages":"271 - 280"},"PeriodicalIF":0.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TID Characteristics Obtained by Modeling HF Radio Wave Propagation Along Slightly Oblique Paths At Mid-Latitudes 模拟中纬度地区高频无线电波沿微斜路径传播获得的TID特征
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-04-16 DOI: 10.1007/s11141-025-10374-7
N. A. Semenova, F. I. Vybornov, S. M. Grach
{"title":"TID Characteristics Obtained by Modeling HF Radio Wave Propagation Along Slightly Oblique Paths At Mid-Latitudes","authors":"N. A. Semenova,&nbsp;F. I. Vybornov,&nbsp;S. M. Grach","doi":"10.1007/s11141-025-10374-7","DOIUrl":"10.1007/s11141-025-10374-7","url":null,"abstract":"<p>We present the results of modeling of synchronous propagation of decameter radio waves along three slightly oblique paths in the mid-latitude ionosphere when a sickle-shaped traveling ionospheric disturbance (TID) is recorded. The ray tracing of waves propagating in a smoothly inhomogeneous ionospheric magnetoplasma is performed. Distance–frequency characteristics of oblique chirp sounding of the ionosphere, obtained on December 19, 2019 with an interval of 1 min on the Vasilsursk–Nizhny Novgorod, Yoshkar-Ola–Nizhny Novgorod, and Yoshkar-Ola–Vasilsursk paths, are used as initial data. The perturbation of the electron number density profile during the TID passage is modeled by a harmonic function (localized plane half-wave), and its parameters are selected according to the best agreement between the simulation results and the experimental data. Estimates of the TID propagation azimuth and velocity in this direction were 105° and 65–105 m/s, respectively.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 4","pages":"296 - 304"},"PeriodicalIF":0.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Q-Bursts in the Earth–Ionosphere Cavity with a Day–Night Non-Uniformity 昼夜不均匀的地球-电离层空腔q暴
IF 0.8 4区 地球科学
Radiophysics and Quantum Electronics Pub Date : 2025-04-16 DOI: 10.1007/s11141-025-10375-6
Y. P. Galuk, A. P. Nickolaenko, M. Hayakawa
{"title":"Q-Bursts in the Earth–Ionosphere Cavity with a Day–Night Non-Uniformity","authors":"Y. P. Galuk,&nbsp;A. P. Nickolaenko,&nbsp;M. Hayakawa","doi":"10.1007/s11141-025-10375-6","DOIUrl":"10.1007/s11141-025-10375-6","url":null,"abstract":"<p>The propagation of Q-bursts in the Earth–ionosphere cavity with a day–night non-uniformity is numerically simulated for the first time. The vertical conductivity profiles of the middle atmosphere differ from each other in the daytime and night-time hemispheres. The model of a smooth day–night transition in the ionosphere is used. The waveguide parameters in the ambient daytime and night-time conditions are computed using the full wave method in the form of a Riccati differential equation. These parameters are included in the numerically solved 2D telegraph equation (2DTE), thus providing complex spectra of the vertical electric field component. The solution obtained in the frequency domain is verified by comparison with published data. The sought waveforms of Q-bursts are computed using the inverse Fourier transform of complex spectra calculated in the 1–1000 Hz band with a 1-Hz step. Impact of the day–night non-uniformity is estimated by comparing the pulse waveforms on different propagation paths and using instant 2D field distributions in the Earth–ionosphere cavity. Time domain models of Q-bursts in the non-uniform Earth–ionosphere cavity were obtained for the first time. The day–night non-uniformity causes a time-dependent shift of the antipode pulse maximum from the geometric antipode of the source. A modulation of the amplitude of the negative and positive half-wave of a Q-burst in the vicinity of the ionospheric irregularity is observed. The pulse shape depends on its arrival direction relative to the terminator line. The character of variations in the waveform of Q-bursts indicates that solutions for the uniform cavity can be used for evaluating the source–observer distance in a real cavity. Prospects for experimental detection of the impact of the day–night non-uniformity on the shape of Q-bursts are discussed.</p>","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"67 4","pages":"305 - 325"},"PeriodicalIF":0.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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