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Your search keyword '"Ivashov, Sergey"' showing total 26 results
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26 results on '"Ivashov, Sergey"'

25. Comparison of different methods for reconstruction of microwave holograms recorded by the subsurface radar.

Author

Razevig, Vladimir, Ivashov, Sergey, Vasiliev, Igor, and Zhuravlev, Andrey

Abstract

A family of holographic subsurface radars, named RASCAN, has been produced during more than fifteen years. Until recently RASCAN radar had the direct-gain receiver that was registering amplitude of reflected signal only. Therefore, the obtained images were used without any processing. New generation of RASCAN radars with quadrature receiver allows recording two quadratures of reflected signal and finding its amplitude and phase. The performance of such devices crucially depends on the frequency bandwidth of sounding signal and on the appropriate reconstruction algorithms. The goal of this paper is to discuss the basics of various approaches such as single-frequency, two-frequency and wide-band. The comparison of the methods was carried out on the simulated and experiment holograms. [ABSTRACT FROM PUBLISHER]

Published
2012
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26. Processing of holographic subsurface radar data.

Author

Zhuravlev, Andrey, Ivashov, Sergey, Vasiliev, Igor, and Razevig, Vladimir

Abstract

A backward propagation algorithm of reconstructing images is considered with experimental data obtained by holographic subsurface radars of RASCAN type. This family of radars uses stepped frequency continuous wave signals and can record in-phase and quadrature components of the reflected signal with a frequency bandwidth of 0.5 to 1 GHz with a center frequency ranging from 2 to 14.5 GHz (depending on radar modification). Among examined data acquiring scenarios were both contact and stand off measurements in media with different attenuation. The reconstructed images were shown to have high plan resolution and easy to interpret as the reconstructed microwave images preserve shape and other features of the optical images. Further modifications are suggested to improve the performance of the system. [ABSTRACT FROM PUBLISHER]

Published
2012
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