For the finite-difference time-domain(FDTD)solution of the half-space problem,the conventional total-field/scattered-field(TF/SF)technique cannot be directly applied to introduce excitation fields for electromagnetic scattering from the ground.In this paper,we extend the generalized total-field/scattered-field(G-TF/SF)method to accurately calculate the high altitude electromagnetic pulse(HEMP)environment in 3D ground scenarios and adopt the convolution perfectly matched layer(CPML)absorption boundary condition around it.The G-TF/SF method effectively eliminates edge effects in numerical calculations for finite ground,thereby improving accuracy in the calculation of the ground electromagnetic environment.Moreover,only the incident field needs to be introduced at the G-TF/SF boundary,avoiding the computation of reflected and transmitted fields.
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