Abstract—This paper presents an investigation for the electromag-netic scattering characteristic of the 2-D infinitely long target located above two-layered 1-D rough surfaces. A finite-difference time-domain (FDTD) approach is used in this study, and the uniaxial perfectly matched layer (UPML) medium is adopted for truncation of FDTD lattices, in which the finite-difference equations can be used for the to-tal computation domain by properly choosing the uniaxial parameters. The upper and lower interfaces are characterized with Gaussian statis-tics for the height and the autocorrelation function. For the compos-ite scattering of infinitely long cylinder and underlying single-layered rough surfaces as an example, the angular distribution of scattering co-efficient with different incident angles is calculated and it shows good agreement with the numerical result by the conventional method of moments. And the influence of some parameters related to the two-layered rough surfaces and target on composite scattering coefficient is investigated and discussed in detail. 1.
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Li et al. (2008) studied this question.
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