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Перегляд Радиофизика и радиоастрономия, 2002, № 4 за назвою

Репозиторій DSpace/Manakin

Перегляд Радиофизика и радиоастрономия, 2002, № 4 за назвою

Сортувати за: Порядок: Результатів:

  • About Radiation of Short Pulses by Wire Antenna of Finite Length 
    Gorobets, N.N.; Dumin, A.N.; Dumina, O.A. (Радиофизика и радиоастрономия, 2002)
    The problem of short pulse radiation by the wire antenna of finite length is considered in time domain. Physical peculiarities of the change of a pulse form in all space of observation are investigated without any limitation ...
  • Accelerated Algorithm of Least-Sguares Approximation of Signals by Exponentials for Wideband Frequency-Domain Reflectometry 
    Andreev, M.V.; Drobakhin, O.O.; Demyantchuk, K.A. (Радиофизика и радиоастрономия, 2002)
    In the paper the possibility of acceleration of procedure of best least-squares approximation of signals by exponentials was considered. For this purpose the analytical expressions for components of gradient vector and ...
  • Application of the Nanosecond Pulses 
    Krymsky, V.V. (Радиофизика и радиоастрономия, 2002)
    In operation two usages of short impulses are considered: a radiolocation and physical chemistry. The features of the characteristics of units of an impulse locator are reduced. Its high noise immunity is marked. The ...
  • Detection of ultrawideband radar signals scattered from complex targets 
    Immoreev, I.J.; Fedotov, D.V. (Радиофизика и радиоастрономия, 2002)
    The questions of detection of radar-tracking signals are discussed, which parameters are unknown. The method for detection of radar signals which parameters are unknown is considered. The method is based on correlation ...
  • Diffraction of Modulated Electromagnetic Impulses on Periodical Grating 
    Gavrilova, T.V.; Sidorenko, Yu.B. (Радиофизика и радиоастрономия, 2002)
    The problem of diffraction of amplitude-modulated impulses with linear frequency modulation on the planar periodical grating consisting of infinitely thin and ideally conducting strips has been considered. The ability to ...
  • Dispersive Effect Correction for Ultra-Short Impulse Signals Using Joint Time-Frequency Transforms 
    Deng, H. (Радиофизика и радиоастрономия, 2002)
    The Joint Time-Frequency Transforms (JTFT) are employed to identify the time-frequency distribution of dispersed ultra short impulse signals transmitted through unknown propagation channels in the presence of noise. The ...
  • Effect of Ultra-Short Pulse Signals on Information System Survivability 
    Serkov, A.A. (Радиофизика и радиоастрономия, 2002)
    Here, the problems dealt with a survivability simulation of information systems under destabilizing electromagnetic effect have been considered. Proposed was the graph-analytic model of the information system and the ...
  • Evolution Equations for the Time-Domain Modes in Lossy Waveguides 
    Tretyakov, O.A. (Радиофизика и радиоастрономия, 2002)
    Complete set of the time-domain modes is presented for a waveguide regular geometrically along its axis Oz . The waveguide under study may have an arbitrary closed singly connected contour L of its cross section. Waveguide ...
  • Impulse Source in the Vicinity of a Convex Impedance Body: Minimization of the Field in the Shadow Region 
    Zvyagintsev, A.A.; Ivanov, A.I.; Katkov, D.V. (Радиофизика и радиоастрономия, 2002)
    The work deals with the optimization problem of impulse source field minimization in the shadow region of a convex body with variable surface impedance. The optimal impedance is searched using uniform asymptotic methods ...
  • Magnetron Transmitters for High-Resolution Radars 
    Belikov, A.A.; Kozhyn, R.V.; Trush, B.V.; Vavriv, D.M.; Volkov, V.A. (Радиофизика и радиоастрономия, 2002)
    95 GHz, 2 kW radar transmitters with the output pulse duration of 10 ns and the pulse repetition frequency of 40 kHz are presented. The transmitters are based on the spatial-harmonic magnetron with cold secondaryemission ...
  • Main Capabilities and Features of Ultra Wideband (UWB) Radars 
    Immoreev, I.J. (Радиофизика и радиоастрономия, 2002)
    This review paper discusses the differences between ultra wideband (UWB) radars and the conventional narrow-band radars. The features are shown of the generation, radiation and processing of UWB radar signals evoked by the ...
  • Mathematical Simulation of Ultra Wideband Signals Scattered by Mines Buried in Ground. Algorithms of Mine Detection and Identification 
    Sukharevsky, O.I.; Zalevsky, G.S.; Muzychenko, A.V. (Радиофизика и радиоастрономия, 2002)
    Method of mathematical simulation of ultra wideband signals scattered by metal or dielectric mine and other subsurface objects located in ground or other medium is described. Method allows for getting electromagnetic signals ...
  • Modification of the Gelfand-Levitan Method for 1-D Multylaered Structure Inverse Problem 
    Drobakhin, O.O.; Andreev, M.V.; Novomlinov, A.; Korotkaya, V.; Sazonov, A.Z. (Радиофизика и радиоастрономия, 2002)
    For dielectric slab with step profile of dielectric constant the Gelfand-Levitan method is correct if peaks of time-domain reflected signal are close to δ-pulses. Combination of parametric spectral methods for obtaining ...
  • New IEC Standards Requirements to the Parameters of Powerful Electromagnetic Pulsed Disturbances 
    Kravchenko, V.I.; Knyazyev, V.V.; Koliushko, G.M.; Vavriv, L.V. (Радиофизика и радиоастрономия, 2002)
    The European Union Directive on EMC defines a new concept of providing electromagnetic compatibility. The Directive mandates that all electromagnetic phenomena which can influence the operation of technical devices need ...
  • On the Basic Concepts of UWB Radar Scan 
    Astanin, L.Yu.; Kostylev, A.A.; Fliorova, A.A. (Радиофизика и радиоастрономия, 2002)
    In this paper, the terms in wide use, the Ultra Wideband (UWB) signal and the Ultra Shot Impulse (USI), are discussed. Their usage conditions are considered and the difference in meanings is determined. As main tool for ...
  • Propagation of Short Electromagnetic Pulses through Nonconducting Media with Electric and Magnetic Dipole Currents 
    Harmuth, H.F.; Lukin, K.A. (Радиофизика и радиоастрономия, 2002)
    Propagation of electromagnetic signals through a non-conducting medium with very low density of neutral gas is considered with taking into account both electric and magnetic dipole currents. A new approach based on microscopic ...
  • Propagation of Short Pulses in Plasma Half-Space (Ionosphere) 
    Gutman, A.L. (Радиофизика и радиоастрономия, 2002)
    The exact solution of the problem in the half-space of non-homogeneous plasma is obtained, and an asymptotic method for the same task as well. The estimations of the non-linearity and the electron-atom collisions influence ...
  • Pulse Scattering on Objects in the Inhomogeneous Conducting Medium 
    Varyaniza-Roshchupkina, L.A.; Kovalenko, V.O. (Радиофизика и радиоастрономия, 2002)
    The objective of the work is to present the results of computer simulation of the problem of pulse scattering on cylinder objects buried in the inhomogeneous conducting medium. The finite difference time domain method ...
  • Radar Range Equation for Ultra Wideband Signals and Ultra Short Pulses 
    Avdeev, V.B. (Радиофизика и радиоастрономия, 2002)
    The range equation for radiolocation of an object and its elements with ultrawideband signals (UWBS) and ultra short pulses (USP) are resulted. The criticism of other published equations is given.
  • Radiation of Ultra-Wideband (UWB) Signals 
    Immoreev, I.J.; Sinyavin, A.N. (Радиофизика и радиоастрономия, 2002)
    The radiation of short duration signals (or ultra-wideband – UWB signals) is significantly different from the long duration narrowband signals (see Table 1 below). Paper analyzed the processes in linear antennas and gives ...

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