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Journal Information-measuring and Control Systems №9 for 2010 г.
Article in number:
Restoration of informative parameters of plane layered medium basing on computational diagnostics method and algorithms of global optimization
Keywords: electrophysical parameters plane layered mediums Green's function reconstruction computational diagnostics operator equation numerical modeling FDTD modeling
Authors:
V. S. Temchenko, E. V. Ilyin
Abstract:
Traditional methods of layered mediums diagnostics use ray interpretation of propagation. These methods have some serious limitations; in particular, only portion of data, registered by Ground Penetrating Radar (GPR) is used in further processing. During last years new approaches have been developed with the aim to increase the reliability of layered mediums diagnostics. This is achieved due to partial or more complete electrodynamics simulation of transmit-receive antenna with taking into account GPR RF channel and peculiar properties of propagation and medium reflection of electromagnetic field. This paper is aimed at improving of diagnostics quality of geometrical and electrophysical parameters of plane layered medium sounded with ultra-wideband short-pulse signals. Two methods are presented which fully and partially taking into account the main artifacts which distort both the sounding and the scattered UWB signals. The most essential are the artifacts caused by effective height of transmitting and receiving antennas as well as by radio frequency channels of transmitter and receiver. CDM: plane waves decomposition. In [7] antenna vector effective height is represented as finite sum of propagating E- and H plane waves and is defined basing on tangent field component distribution by antenna aperture. CDM: virtual source. Characteristics of GPR transmit/receive T-horn antenna (its radiated field) and the field reflected by layered medium are equated with the field produced by horizontal elementary electrical dipole. The dipole is placed above medium surface, its position is determined by coordinates of "virtual source", which is located inside of antenna. Real antenna directional characteristics are ignored in this approach. Both frequency response and virtual source coordinates are taken into account, which are determined by calibration procedures. The results of registering these artifacts as well as results of experimental reconstruction of parameters for plane layered medium are presented.
Pages: 13-22
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