LF Radio Wave Prediction at Short Ranges With High Propagation Angles Over Irregular Terrain
LF Radio Wave Prediction at Short Ranges With High Propagation Angles Over Irregular Terrain
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DOI：
10.1109/lawp.2016.2601138
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发表时间：
2017
影响因子：
4.2
通讯作者：
Lili Zhou;Dandan Wang;Zhonglin Mu;Xiaoli Xi;Lifeng He
中科院分区：
文献类型：
--
作者：
Lili Zhou;Dandan Wang;Zhonglin Mu;Xiaoli Xi;Lifeng He
用时域有限差分法和单向/双向抛物线方程(PE)方法分析了近距离、大传播角的低频无线电波的传播特性。同时考虑了窄角(NA)和广角(WA)PE表达式。结果表明，NAPE方法很难应用于传播角大于15°的区域，而WAPE方法只要地表斜率不是很大，就可以获得较高的精度。如果地形坡度变化很大，则使用干涉图案进行双向WAPE的结果更可靠。然而，没有充分考虑山体上波浪的绕射效应。
Propagation characteristics of low-frequency radio waves at short ranges and with high propagation angles are analyzed by the finite-difference time-domain and one-way/two-way parabolic equation (PE) methods. Both narrow-angle (NA) and wide-angle (WA) PE expressions are considered. It is observed that the NAPE method is hard to be applied in the region where the propagation angle is above 15°, whereas the WAPE method can obtain a higher accuracy so long as the earth surface slope is not very big. If the terrain slope changes dramatically, results of the two-way WAPE are more reliable with an interference pattern. However, diffraction effects of the waves over the mountain are not given full consideration.