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V.G. Mashkov, V.А. Malyshev, V.P. Strazhnik

The relevance of the study is due to the need to create a radar system for landing a helicopter-type aircraft on an unprepared site with the possibility sensing the underlying surface (landing site), determining the parameters and characteristics plane-layered media and issuing information to the flight crew about the possibility of landing or lack thereof. Regular means installed on helicopter – type aircraft are currently not able to provide the flight crew with information about the underlying surface (landing site) such as snow depth, ice thickness and so on commensurate with the actual load and weight of the helicopter-type aircraft. A variant using the midpoint method related to the bistatic diagnostic method is based on measurements of the time delay between the direct wave and the subsurface layer reflected from the base, which is a function its thickness. The data obtained, under certain conditions, allow to restore the geometric and electrophysical parameters of the layered structure. However, there are a number of factors in the diagnosis of plane-layered media by bistatic methods, which make a significant contribution to the total error, especially due to a slight longitudinal heterogeneity, or a weak dispersion even one the layers the structure, which cannot be considered in the simulation. Then, in the diagnosis real plane-layered structures based on bistatic data, the error in determining the thickness of the layers and electrophysical parameters increases.

Keywords: plane-medium; subsurface sensing; landing of the helicopter; a landing place; an unprepared area.

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