Browsing by Author "Drobakhin, O. O."

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3-probe microwave measuring instrument of vibration of mechanical objects with non-plane surface 3-probe microwave measuring instrument of vibration of mechanical objects with non-plane surface
(Видавництво Національного університету "Львівська політехніка", 2009) Drobakhin, O. O.; Doronin, A. V.; Grigor’ev, V. V.
Application of processing, which is specific to holographic concept with three reference signals, for complex reflection coefficient measurements by means of three-probe waveguide section is suggested. A mathematical model of diode detector on base of neural net is considered. The model provides a high level of square-law of output signal of detector and complex reflection coefficient measurements. The optimal model of neural net has structure of 1-4-1 neurons. For measurement of movement parameters estimation was done. As object of researches there was a metal concave and convex surface with various curvatures. For a decrease of a noise influence in the data, the Tikhonov’s regularization method was used. Efficiency of the method has been proved experimentally.
Scattering wideband pulse signals by non-smooth surfaces
(Видавництво Національного університету "Львівська політехніка", 2009) Drobakhin, O. O.; Saltykov, D. Yu.; Saltykov, A. D.
Processes of scattering and reflection of wideband signals by non-smooth rough surfaces in the frequency range of 38 - 52 GHz have been investigated. Dependences of reflection coefficient for various non-smooth surfaces versus distance up to the antenna and the degree of roughness of the sample surface have been obtained experimentally. The influence of behavior and the degree of surface heterogeneity on the value of the reflection coefficient has been estimated using results of the measurements, the influence of spatial orientation of the scattering surface on amplitude of the reflected signal has been revealed.