Перегляд за автором "Vavriv, D.M."

Сортувати за: Порядок: Результатів:

  • Bistability in the Duffing oscillator under combined high- and low-frequency forcing 
    Nimets, A.Y.; Vavriv, D.M. (Вопросы атомной науки и техники, 2015)
    The bistablity onset due to the interaction of high- to low-frequency oscillations in the Duffing oscillator is considered. It is shown that such interaction results in arising of additional bistable states, which has a ...
  • Chaos and frequency transformation in systems of coupled oscillators 
    Buts, V.A.; Vavriv, D.M.; Tarasov, D.V. (Радіофізика та електроніка, 2013)
    Chaotic instabilities and frequency transformations caused by the interaction of oscillators are important effects for many applications. We review these effects from the point of view of their influence on the dynamics ...
  • Clinotron: a Promising Source for THz Regions 
    Manzhos, S.; Schuenemann, K.; Sosnytskiy, S.V.; Vavriv, D.M. (Радиофизика и радиоастрономия, 2000)
    Potentials of the backward-wave oscillator (BWO) with an inclined electron beam (the clinotron) as a source of electromagnetic radiation in THz regions are examined. A self-consistent collective electron-wave interaction ...
  • Cost-Effective Airborne SAR 
    Vavriv, D.M.; Vynogradov, V.V.; Volkov, V.A.; Kozhyn, R.V.; Bezvesilniy, O.O.; Alekseenkov, S.V.; Shevchenko, A.V.; Belikov, A.A.; Vasilevskiy, M.P.; Zaikin, D.I. (Радиофизика и радиоастрономия, 2006)
    A Ku-band airborne SAR, which is a cost effective system in terms of the development and exploitation costs, has been recently developed and tested at the Institute of Radio Astronomy of the National Academy of Sciences ...
  • Dependence of magnetron characteristics on the secondary-emission yield of cold cathode 
    Avtomonov, N.I.; Sosnytskiy, S.V.; Vavriv, D.M. (Вопросы атомной науки и техники, 2006)
    Particle simulations of mm-wavelength magnetrons with cold secondary-emission cathodes show that such important practical characteristics as the output power, efficiency, and operation current are dependent on ...
  • Electrically switchable, Ka-band slotted waveguide antenna array system 
    Sekretarov, S.S.; Vavriv, D.M.; Volkov, V.A.; Natarov, M.P.; Glamazdin, V.V. (2008)
    An original electrically switchable, Ka-band slotted waveguide antenna array system has been recently developed, produced, and tested. The system consists of four identical sections, which are connected to a radar ...
  • Estimating Cloud and Rain Parameters from Doppler Radar Data 
    Bezvesilniy, O.O.; Peters, G.; Vavriv, D.M. (Радиофизика и радиоастрономия, 2003)
    Real-time mapping of the parameters of precipitating water clouds and rain making use of a vertically-directed Doppler radar is an important problem. In this paper, an algorithm based on an independent estimation of the ...
  • Experimental Ka-Band Ground-Based SAR System 
    Bezvesilniy, O.O.; Vavriv, D.M.; Volkov, V.A.; Kravtsov, A.A.; Bulakh, E.V.; Vinogradov, V.V.; Sekretarov, S.S. (Радиофизика и радиоастрономия, 2015)
    An experimental ground-based synthetic aperture radar (GB-SAR) system operating at Ka-band has been developed. The system is designed to be operated from a top a hill or from a building roof, etc. for imaging the underlying ...
  • High Sensitivity 0.5 to 19.5 GHz Receiver with 1.1-GHz Instantaneous Bandwidth 
    Volkov, V.V.; Vavriv, D.M.; Bulakh, E.V.; Kravtsov, A.A. (Радиофизика и радиоастрономия, 2014)
    A wideband high sensitivity microwave receiver operating within 0.5 to 19.5 GHz and providing a 1.1-GHz instantaneous bandwidth is described. The receiver shows a noise figure as low as 10 dB and the input third-order ...
  • Instability of the system of charged particles in the external constant magnetic field 
    Buts, V.A.; Vavriv, D.M. (Problems of Atomic Science and Technology, 2022)
    The results of studying the features of the dynamics of a system of charged particles (electrons) in an external magnetic field are described. The considered model practically coincides with the model of an ideal plasma. ...
  • 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 ...
  • Mathematical Model of Spatial-Harmonic Magnetron with Cold Secondary-Emission Cathode 
    Schuenemann, K.; Sosnytskiy, S.V.; Vavriv, D.M. (Радиофизика и радиоастрономия, 2000)
  • Millimeter-Wave Radars for Environmental Studies 
    Vavriv, D.M.; Volkov, V.A.; Bormotov, V.N.; Vynogradov, V.V.; Kozhyn, R.V.; Trush, B.V.; Belikov, A.A.; Semenyuta, V.Ye. (Радиофизика и радиоастрономия, 2002)
    A review is given of recent activities undertaken in the Institute of Radio Astronomy of the National Academy of Sciences of Ukraine for the development of millimeter-wave radars. The radars constructed include cloud radars ...
  • Multi-Look Radiometric Correction of SAR Images 
    Bezvesilniy, O.O.; Gorovyi, I.M.; Vynogradov, V.V.; Vavriv, D.M. (Радиофизика и радиоастрономия, 2011)
    Deviations of the aircraft trajectory and instabilities of the aircraft orientation lead to non-uniform illumination of the ground by the antenna beam and, as a result, to radiometric errors in radar images obtained with ...
  • Pipeline Signal Processing with High Resolution in Both Time and Frequency Domains 
    Sosnytskiy, S.V.; Vavriv, D.M. (Радиофизика и радиоастрономия, 2015)
    An algorithm for real time signal processing with high accuracy of determining both frequency and time characteristics of RF signals is proposed. The algorithm provides frequency resolution through FFT processing and pulse ...
  • Routes to chaos through the interaction of high- and low-frequency oscillations 
    Shygimaga, D.V.; Vavriv, D.M. (Вопросы атомной науки и техники, 2001)
    Roads to chaos for systems with the interaction of high- and low-frequency oscillations are considered. Results are presented for quisi-periodically forced Duffing and Van-der-Pole oscillators and a two-mode system driven ...
  • SAR Processing Algorithm with Built-In Geometric Correction 
    Bezvesilniy, O.O.; Gorovyi, I.M.; Sosnytskiy, S.V.; Vavriv, D.M.; Vynogradov, V.V. (Радиофизика и радиоастрономия, 2011)
    Synthetic aperture radar (SAR) systems onboard small aircrafts suffer from trajectory deviations and instabilities of antenna orientation. These kinds of motion errors lead to significant geometric distortions in SAR ...
  • The influence of the dynamics features of the trapped particles on a spectrum of their oscillations 
    Buts, V.A.; Vavriv, D.M.; Tarasov, D.V. (Вопросы атомной науки и техники, 2013)
    Some features of dynamics of ensembles of coupled linear and nonlinear oscillators are investigated. It is shown that spectral characteristics of this dynamics essentially depend not only on quantity of the oscillators ...
  • Тhe effect of nonreciprocity on the dynamics of coupled oscillators and coupled waves 
    Buts, V.A.; Vavriv, D.M. (Вопросы атомной науки и техники, 2018)
    The dynamics of nonreciprocally coupled oscillators and coupled waves is studied. Such coupling can lead to converting the energy of low-frequency (LF) oscillations to the energy of high-frequency (HF) oscillations. ...