The accurate analysis of scattering from ob jects with dimensions large compared to the wavelength using rigorous methods (finite element, FDTD, method of moments) with a personal computer is almost impractical. In asymptotic methods, physical optics (PO), geometrical theory of diffraction (GTD), the accurate modeling of the object's boundary is too cumbersome. The parabolic equation method gives accurate results in calculation of scattering from objects with dimensions ranging from one to tens of wavelengths. Solving parabolic equation with the marching method needs limited computer storage even for scattering calculations of large targets. In this paper, first the calculation procedure of radar cross section using parabolic equation is studied and the necessary equations are derived. The parabolic equation and the model of reflecting facet is utilized for calculation of the scattered fields in the forward and backward directions. In order to model the lossy background, the impedance boundary condition is utilized in lower boundary. Finally the scattered fields and RCS of a ship and a tank are calculated as two examples of targets with lossy background.
Ali Reza Mallahzadeh,
"Scattering Computation from the Target with Lossy Background," ,
Vol. 57, 151-163, 2006. doi:10.2528/PIER05070503
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