<\/p>\n
2016, \u00a0<\/span><\/b><\/p>\n \u00a0<\/span><\/b><\/p>\n \u00a0<\/span><\/b><\/p>\n ENERGY CHARACTERISTICS OF A RECTANGULAR WAVEGUIDE S.\u00a0L.\u00a0Berdnik, 4-14<\/span><\/p>\n The study of peculiarity of influence of the impedance \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n REFLECTION RESONANCES IN A RECTANGULAR WAVEGUIDE L.\u00a0P.\u00a0Mospan, 15-21<\/span><\/p>\n Intentional and controllable introduction of \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n RADAR<\/span><\/b> <\/b>ELEVATION Yu.\u00a0A.\u00a0Pedenko<\/span><\/i><\/p>\n 22-30<\/span><\/p>\n The work is devoted to improvement of the accuracy of \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n RESEARCH <\/span><\/b>ON<\/span><\/b> THE UNDERLYING SURFACE BY RADIATION OF GLOBAL NAVIGATION SATELLITE SYSTEM<\/span><\/b><\/p>\n V. I. Lutsenko, D. O. Popov, I. V. Lutsenko<\/span><\/i><\/p>\n 31-39<\/span><\/p>\n The investigation of the scattering signals features \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n R<\/span><\/b>ADIANT<\/span><\/b> S<\/span><\/b>YSTEM<\/span><\/b> <\/b>BASED<\/span><\/b> <\/b>ON<\/span><\/b> <\/b>COLD<\/span><\/b> <\/b>PLASMA<\/span><\/b><\/p>\n V. V. Ovsyanikov<\/span><\/i><\/p>\n 40-47<\/span><\/p>\n The actual problem of studying the basic properties and searching for methods \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n PLASMA-BEAM SUPERHETERODYNE FREE ELECTRON LASER WITH H<\/i>-UBITRON A. V.\u00a0Lysenko, G. A.\u00a0Oleksiienko<\/span><\/i><\/p>\n 48-54<\/span><\/p>\n A cubic-nonlinear theory of a plasma-beam \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n OPERATING MODES OF AVALANCHE-GENERATOR DIODES OF P. P. Maksymov<\/span><\/i><\/p>\n 55-60<\/span><\/p>\n Construction of powerful sources of \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n THREE-CHANNEL PHASE METERS BASED ON THE AD<\/i>8302 A. V. Varavin, G. P. Ermak, A. S. Vasilev, A. 61-70<\/span><\/p>\n The paper presents the results of research \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n ELECTROMECHANICAL RESONATOR UNDER THE INFLUENCE OF Z. \u0410. Maizelis<\/span><\/i><\/p>\n 71-76<\/span><\/p>\n For detecting and establishing the nature \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n RECONSTRUCTION OF IMAGES WITH LARGE NON-UNIFORM S. I. Melnyk, S. S. Melnyk<\/span><\/i><\/p>\n 77-84<\/span><\/p>\n In recent years, the range of tasks related \u00a0<\/span><\/p>\n \u00a0<\/span><\/p>\n JITTER<\/span><\/b> OF <\/span><\/b>SYNCHRONIZATION V.\u00a0P.\u00a0Ruban<\/span><\/i><\/p>\n 85-91<\/span><\/p>\n The estimation of synchronization <\/p>","protected":false},"excerpt":{"rendered":" 2016, Vol.\u00a07(21), \u2116 1 \u00a0 \u00a0 \u00a0 ENERGY CHARACTERISTICS OF A RECTANGULAR WAVEGUIDE T-JUNCTION INTERACTING WITH A MULTIELEMENT VIBRATOR-SLOT COUPLING STRUCTURE S.\u00a0L.\u00a0Berdnik, V.\u00a0A.\u00a0Katrich, V.\u00a0I.\u00a0Kiyko, M.\u00a0V.\u00a0Nesterenko, Yu.\u00a0M.\u00a0Penkin 4-14 The study of peculiarity of influence of the impedance insertions on the electrodynamic characteristics of the rectangular waveguide junctions, which are widely used in the antenna-waveguide devices, is […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3239","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/pages\/3239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/comments?post=3239"}],"version-history":[{"count":4,"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/pages\/3239\/revisions"}],"predecessor-version":[{"id":3243,"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/pages\/3239\/revisions\/3243"}],"wp:attachment":[{"href":"https:\/\/www.ire.kharkov.ua\/en\/wp-json\/wp\/v2\/media?parent=3239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nVol.\u00a07(21), \u2116 1<\/span><\/b><\/p>\n
\nT-JUNCTION INTERACTING WITH A MULTIELEMENT VIBRATOR-SLOT COUPLING STRUCTURE<\/span><\/b><\/p>\n
\nV.\u00a0A.\u00a0Katrich, V.\u00a0I.\u00a0Kiyko, M.\u00a0V.\u00a0Nesterenko,
\nYu.\u00a0M.\u00a0Penkin<\/span><\/i><\/p>\n
\ninsertions on the electrodynamic characteristics of the<\/span> rectangular
\nwaveguide junctions,<\/span> which are widely used in the
\nantenna-waveguide devices, is important for practical applications. A
\nmathe-matical model for E<\/i>-plane T-junction<\/span> of
\nrectangular waveguides with a three-element vibrator-slot coupling structure
\nwas built using approximate analytical solutions of equations for induced
\ncurrents by a generalized method of electro-magneto-motive forces. The
\ndistinctive feature of the model is the usage of variable surface impedance
\nalong the monopole axes and constant impedance, distributed over the end wall
\nof the <\/span>lateral<\/span> semi-infinite waveguide. Multiparameter
\nenergy characteristics of the junction in the single-mode waveguides are
\npresented including the case of meta-material coating the end wall of the
\nlateral waveguide. The possibility of efficient use of impedance coatings as
\ncontrol element for power division between the output waveguide junction arms
\nis shown.<\/span><\/p>\n
\nSECTION WITH A PAIR OF ANTIPODAL RECTANGULAR POSTS<\/span><\/b><\/p>\n
\nS.\u00a0A.\u00a0Prikolotin, \u0410.\u00a0\u0410.\u00a0\u041airilenko<\/span><\/i><\/p>\n
\nattenuation poles into the frequency responses of frequency-selective devices
\nis in the great demand in the design of modern filters with complicated
\nperformance. Successful implementation of such an approach is possible using
\nrectangular waveguide sections with metallic inserts. Here, the scattering
\ncharacteristics of such sections with a pair of antipodal rectangular posts as
\nwaveguide units with rotational symmetry are studied. Comparative analysis with
\nthe characteristics of a section with a pair of unidirectional posts is performed.
\nSpectral theory of open waveguide resonators is used in order to interpret the
\nresonant phenomena. Within the frames of spectral theory the reflection
\nresonances formed by such sections are the responses to the excitation of eigen
\noscillations of complex frequencies. It is shown that the spectral theory
\nenables an order of magnitude more accurate (in comparison with the
\nconventional modal analysis) evaluation for basic parameters of the resonance
\nreflection, namely its frequency and the quality factor. The results obtained
\nmake preliminary synthesis of frequency selective devices based on such
\nsections physically transparent and more accurate.<\/span><\/p>\n
\nANGLES MEASUREMENTS OF LOW-ALTITUDE TARGETS OVER THE SEA BY ROOT-MUSIC<\/span><\/b> <\/b>METHOD UNDER INTERFERENCE FROM MULTIPATH AND THERMAL
\nNOISE <\/span><\/b>\u041e<\/span><\/b>F DIRECTION FINDER<\/span><\/b><\/p>\n
\nradar measurements of elevation angles of low-altitude targets above sea level
\nwhen using the root-MUSIC<\/i>, which is considered by experts as one of the
\nmeans to solve this problem. Unlike previous studies, which take into account
\nthe multipath only, in this study the clutter is complicated by thermal noise
\nof radar. This allows to evaluate the capabilities of the method and provide
\nguidance on its application in the conditions close to reality. The study was
\ncarried out by computer simulation. It covered various sea states at which the
\nconditions from specula to strong diffuse reflection were complied. In the
\nsimulation a wide range of signal\/noise ratio was used. The main focus was the
\nstudy of effects on measurement errors of a priori parameters of the method:
\nthe signal subspace dimension and the order of autocorrelation matrix of
\nsignals received by a multi-element antenna array. The recommendations of their
\nchoice, allowing to minimize the errors of elevation measurement in different
\nconditions, have been developed. The results of the study extend the knowledge
\nof how to improve the methods for measuring the target elevation angle above
\nthe sea.<\/span><\/p>\n
\non the land surface can be used to study the physics of scattering processes,
\nas well as for the establishment of multipath compensation methods for reducing
\npositioning errors in global navigation satellite systems. The possibility of
\ndetecting the reflection areas on the underlying surface and estimating their
\nparameters by using radiation of global navigation satellite systems is shown.
\nThe behavior of the signal levels for different satellites in urban areas is
\nanalyzed. The influence of the reflection area\u2019s characteristics on the
\nspectrum of the received radiations is considered; the method of determining
\ntheir location is proposed.<\/span><\/p>\n
\nof improving the plasma radiator array, which is similar to the array of metal
\nor dielectric antennas, has been considered. This problem is not sufficiently
\ncovered in the well-known publications, however, the great interest of
\nprofessionals to emitters based on cold plasma is due to the prospect of
\ncreating effective multi-beam scanning selective plasma reconfigurable systems
\nor the plasma array of radiators (PAR). The article studies the main
\nelectrodynamics parameters of PAR in the microwave range, characterizing it on
\nthe one hand, as the load for the generator (receiver) of electromagnetic (EM)
\nsignal. On the other hand, PAR is tested as transmitter of EM energy from the
\npoint of view of its direction pattern (DP) and the main parameters of
\nradiation of PAR. When scanning DP beam, impedance distortion of PAR
\ntransmitters and DP deformation are investigated. For comparison, similar
\nstudies were carried out for the same design and configuration of the pattern
\nantenna (PA) of metal antennas. The studies have been carried out by PAR
\nmodeling and their parameters calculations on computer in software environment
\nFEKO by integral equation method and method of moments for linear PAR from 4
\nemitters in the form of loop dielectric tubes filled with cold plasma under
\nreduced pressure. When studying the self and mutual impedances of the PAR and
\nmetal PA in common mode for the distance between the transmitters 0.5\u03bb0<\/sub>, where \u03bb0<\/sub> is the central wavelength
\nof the test range, it has been determined that electromagnetic interference
\nbetween antennas in PAR is less than in the metal antenna array, and when
\nreducing the distance between transmitters grating with 0.5\u03bb0<\/sub> \u2013 0.25\u03bb0<\/sub> the relative change in
\nvalue of units of the input impedance of each radiator of PAR is twice less
\nthan for a lattice of aluminum, which allows to bring together the radiator of
\nPAR without a substantial increase in interference between them. From
\ncomparison of DP of radiant systems of PAR and aluminum arrays while scanning,
\nit is obvious that DP of PAR are less distorted than aluminum array. The
\nobtained results can be used for calculations and design of plasma array of
\nradiators.<\/span><\/p>\n
\nPUMP WITH NON-AXIAL INJECTION OF ELECTRON BEAM<\/span><\/b><\/p>\n
\nsuperheterodyne free electron laser (PBSFEL) with H-ubitron pump and non-axial
\ninjection of electron beam has been constructed. In the investigated system the
\nparametric resonance interaction between a space-charge wave and cyclotron wave
\nis realized. The signal wave saturation levels have been determined. It has
\nbeen found that the mode using a slow cyclotron wave has the highest saturation
\nlevel among all possible operation modes of the PBSFEL with H<\/i>-ubitron
\npump. The injection angle of the beam at which the electromagnetic signal gain
\nis maximal has been determined. It has been shown that PBSFELs using slow
\ncyclotron waves are able to create a powerful coherent electromagnetic
\nradiation in the millimeter wavelength range.<\/span><\/p>\n
\nMICROWAVE RANGE<\/span><\/b><\/p>\n
\nelectromagnetic oscillations of microwave range is an actual task for creating
\nmodern semiconductor devices. In this paper the creation of powerful sources of
\nelectromagnetic oscillations based on reverse-biased abrupt p\u2013n<\/i>-junctions
\nof avalanche-generator diodes (AGD) with external signal has been theoretically
\ngrounded. Classification of modes of avalanche-generator diodes has been
\ncarried out. The choice of oscillations generation mode is determined by the
\nparameters of AGD and input signal. It is shown that coherent, multifrequency
\nand broadband oscillations are generated in AGD. Power and spectral
\ndescriptions of oscillations of AGD are presented. The research results are of
\ninterest for the developers of powerful diode generators with the required
\nrange, power and spectral characteristics.<\/span><\/p>\n
\nAND FIELD PROGRAMMABLE GATE ARRAYS <\/span>FOR
\nHETERODYNE MILLIMETER WAVE INTERFEROMETER<\/span><\/b><\/p>\n
\nS. Fateev, N. Varavin, F. Zacek, J. Zajac<\/span><\/i><\/p>\n
\nand development of two types of phase meters for heterodyne two-wave
\n\u201cunambiguous\u201d interferometer designed to measure the plasma density in tokamak COMPASS.<\/i> The aim of this work is the creation of a phase meter capable of measuring fast
\nphase changes of each probing wave, and their phase difference. Plasma is
\nprobed by two microwave signals with different wavelengths propagating along
\nidentical paths to meet each other. Each analyzed signal acquires a certain phase
\nshift \u03c61<\/sub> and \u03c62<\/sub>, and the \u201cunambiguous\u201d interferometer
\ndetermines the difference (\u03c61<\/sub>\u2013\u03c62<\/sub>). The phase measurement is carried out by using
\nthree-channel phase meters: a phase meter based on the pairs of the AD<\/i>8302
\nand a phase meter based on field programmable gate arrays (FPGA<\/i>). The
\nproposed circuit decisions and algorithms of signal processing allow to measure
\nphases in the range 0\u2026360\u00b0 in real time.<\/span><\/p>\n
\nTELEGRAPH <\/span><\/b>UNBALANCED NOISE
\nOF FREQUENCY<\/span><\/b><\/p>\n
\nof frequency noises in the oscillating system, it is very important to separate
\ndifferent types of noises. For determination of characteristics of the
\nfrequency noise it is necessary to study statistical properties not of actual
\ncoordinate and its derivative, but of complex coordinate of oscillator. Its
\nmoments do not depend on the amplitude noises that often can prevail in the
\nsystem. The growing interest in noises of frequency is related to the fact that
\nthey determine the loss of coherence of vibrations in many systems, from the
\ndevices based on Josephson contacts, to the nanomechanical resonators. The
\nknowledge of statistical characteristics of frequency noises inevitably present
\nin the devices of information read-out in quantum computers will allow correct
\nprocessing of the information in them. Here the influence of the telegraph
\nunbalanced noise of frequency on properties of electromechanical resonator is
\nstudied. It is shown that the dependencies of the higher cumulants contain
\nfeatures, which allow to separate the effects related to the presence of noise
\nof frequency. The results may be useful in the theory of nanomechanical
\nresonators, in processing the data, obtained in the radio-technical devices and
\ndevices, based on Josephson contacts, in quantum computers, in the estimation
\nof precision of atomic clock.<\/span><\/p>\n
\nINCREMENTS<\/span><\/b><\/p>\n
\nto the study of structures image elements of which are beyond the resolution of
\nmatrix type sensors is becoming wider. Thus, the problem of their
\nreconstruction by applying algorithmic and information image processing
\ntechniques is relevant. The problems emerging when observing objects whose
\ndimensions do not exceed several pixels of matrix of recorders have been
\nconsidered. It is shown that motion of the object relative to the matrix and
\nthe use of multiple consecutive frames allow to improve the fidelity of shape
\nand true size of the object. This measurement information can be represented as
\nintegrals along the trajectories on a three-dimensional lattice of space-time
\npixels. The reconstruction of a heterogeneity function of pixels through the
\nuse of the controlled motion of the test object and methods of computer
\ntomography. The possibility of determining the relative velocity of the object
\nin each of the frames using the blind method has been shown. The algorithm of
\nreconstructing images with large non-uniform increment during their arbitrary
\nand controlled relative motion has been elaborated.<\/span><\/p>\n
\nOF THE STROBOSCOPIC CONVERTER<\/span><\/b><\/p>\n
\ninstability becomes actual in GPR due to the fact that this phenomenon affects
\nthe accuracy of recording and reproducing the received signal forms and,
\naccordingly, the efficiency of use of digital signal processing algorithms. The
\nexisting method for estimation of jitter of the GPR receiver using errors of
\nthe converted signal amplitude is not universal and should be corrected for the
\ncase of converter with incomplete charging of the storage capacitor. Simulation
\nof the stroboscopic conversion with instability of sampling interval for cases
\nof full charging (when the evaluation method gives correct results) and
\nincomplete charging of the storage capacitor has been done in this paper. The
\nrelationship between the forms of probabilistic distribution of jitter and
\nerrors of amplitude after stroboscopic conversion has been analyzed. The jitter
\nvalues originally specified in the simulation and the ones calculated
\n(reconstructed) by a known method also have been analyzed. According to the
\nsimulation results, the limits of applicability of this method were determined.
\nIt is shown that the direct application of the jitter evaluation method which
\nis right for the converter with a full charging gives incorrect estimates for
\nthe one with incomplete charging of storage capacitor. Due to this, the signal
\namplitude recovery procedure which allows obtaining a correct estimate of the
\njitter of synchronization of GPR receivers operating in the mode of incomplete
\ncharge storage capacitor has been suggested.<\/span><\/p>\n<\/div>\n