研究目的
To predict the propagation of electromagnetic waves over three-dimensional (3-D) irregular terrains using a vector parabolic equation (PE) method based on perfectly absorbing thin screen.
研究成果
The proposed 3DPE method is able to take the effect of lateral terrains into account and yields good agreements with the 2DPE method in the far-zone. The interference patterns of the direct wave and the ground-reflected wave can be clearly seen.
研究不足
The results are not satisfactory for range less than 0.5 km, especially when the propagation angle is too large.
1：Experimental Design and Method Selection:
The study uses a vector parabolic equation (PE) method under the assumption of forward propagation, with the split-step Fourier transform (SSFT) algorithm to march the potentials from one aperture plane to the next.
2：Sample Selection and Data Sources:
The study involves numerical simulations over pseudo 3-D and real 3-D terrain models.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned.
4：Experimental Procedures and Operational Workflow:
The 3-D PE is formulated from the Helmholtz equation, and terrains are equivalent to a series of perfectly absorbing thin screens. The Tukey window is used to attenuate the fields smoothly at the upper boundary without reflections.
5：Data Analysis Methods:
The results of the 3DPE method are compared with those of the 2DPE method to validate the proposed method.
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