Electromagnetic Pulse Propagation over Nonuniform Earth Surface: Numerical Simulation
For researchers in computational electromagnetics, this provides an efficient simulation method for long-range EM pulse propagation over nonuniform terrain.
The paper simulates electromagnetic pulse propagation over nonuniform earth surfaces using a time-domain parabolic equation, introducing boundary conditions to reduce computational domain. The method enables pulse field calculation in domains of tens of thousands wavelengths, demonstrating soil conductivity's effect on pulse waveform.
We simulate EM pulse propagation along the nonuniform earth surface using so called time-domain parabolic equation. To solve it by finite differences, we introduce a time-domain analog of the impedance boundary condition and a nonlocal BC of transparency reducing open computational domain to a strip of finite width. Numerical examples demonstrate influence of soil conductivity on the wide-band pulse waveform. For a high-frequency modulated EM pulse, we develop an asymptotic approach based on the ray structure of the monochromatic wave field at carrier frequency. This radically diminishes the computation costs and allows for pulsed wave field calculation in vast domains measured by tens of thousands wavelengths.