A three-dimensional finite-difference time-domain (FDTD) approach for electromagnetic scattering from a randomly rough surface is developed. In order to save computing time, a graphics processing unit (GPU) based parallel computing framework is proposed to accelerate FDTD method. The parallel FDTD method assigns a thread for each Yee cell in the computing region for update calculation, and thus can achieve higher computational efficiency than the serial CPU algorithm. The parallel program is executed by a NVIDIA’s Quadro P5000 card. The FDTD model for calculation of EM wave scattering from rough surface is developed. VV polarization and HV polarization bistatic scattering coefficients are calculated.
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