A 3D Split-Step Fourier Algorithm Based on an Discrete Spectral Representation of the Propagation Equation

Hang Zhou (1) , Alexandre Chabory (1) , Rémi Douvenot (1)

1 ENAC - Ecole Nationale de l'Aviation Civile

A propagation method self-consistent in the discrete domain for the simulation of large distance scenarios in a 3D inhomogeneous atmosphere is proposed. First, a spectral representation of the field in a discrete 3D domain over an infinite perfect ground is introduced in cylindrical coordinates. A discrete spectral propagator is then derived. As in 2D methods, the inhomogeneous atmosphere is considered in the spatial domain using phase screens. An explicit numerical scheme is introduced. For directive sources, a sectoral propagation is proposed to reduce the computation time by limiting the computation domain. The method is tested by simulation scenarios involving refractive effects in both vertical and azimuthal directions. The 3D refractive effects are shown to be properly simulated.

Mots clés: refraction; Atmospheric propagation; discrete Fourier transforms; electromagnetic propagation; modeling; operators; parabolic wave equation

Domaines: Sciences de l'ingénieur [physics]; Traitement du signal et de l'image [eess.SP]; Sciences de l'ingénieur [physics]; Electronique

Hang Zhou, Alexandre Chabory, Rémi Douvenot. A 3D Split-Step Fourier Algorithm Based on an Discrete Spectral Representation of the Propagation Equation. IEEE Transactions on Antennas and Propagation, 2017, 65 (1988-1995), ⟨10.1109/TAP.2017.2671018⟩. ⟨hal-01471666⟩