Authors V. V. Bakhchevnikov
Month, Year 07, 2018 @en
Index UDC 621.396
DOI 10.23683/2311-3103-2018-7-155-166
Abstract The growing interest to noncontact subsurface sensing of soil from airborne vehicle forces using of simulation instead of field-tests due to heavy expenses. Many methods are known (finite differences, finite elements method, method of moments, high-frequency approaches, etc.) for accurate or approximate calculations of electromagnetic fields (EMF), that scattered by multilayered structures. However, there has not been developed a generic approach up to now, for fast engineering calculation of radar signal parameters, reflected by layered structures with irregularities and rough boundaries in far field. In this paper a flexible simulation model is produced. The model is capable of impulse response computation for scattering from multilayered surface with irregularities. The model is imitation of near field radar system. There are some features for near field radar system: spherical wave front near object, transformation effect of incident wave polarization basis and occurrence of Doppler frequencies for reflected signal. The object is not concentrated and incident wave is not plane in conditions of small distances. Hence there are some problems that specific for near field. Therefore principles, acceptable for far field problem, can not be used fot near field. The developed model based on boundaries facet representation of space distributed multilayered object. The facet is presented by impedance triangle with known scattering parameters. Resulting EMF is calculated by summarizing of partial fields scattering on triangle facet taking in account phases and polarization of incident electromagnetic wave. The model is based on high-frequency method, and it provides high speed of computations for large area aims having any layers number and the boundaries roughness. The paper deals with results, obtained by model: 1) the complex reflection index for two-layered distributed aim with rough boundaries for different average width of layer; 2) the complex amplitude of the flight path signal, which reflected by subsurface single target; 3) the coefficient of variation and dispersion of scattered radar signal amplitude dependencies from bedding of subsoil waters average depths.

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Keywords Simulation model; radio wave scattering; subsurface sensing; multilayered aim; rough irregularities.
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