Two-Way Parabolic Equation Method for Radio Propagation Over Rough Sea Surface
Two-Way Parabolic Equation Method for Radio Propagation Over Rough Sea Surface
复制标题
粗糙海面无线电传播的双向抛物方程法
DOI：
10.1109/tap.2020.2975288
复制
发表时间：
2020-06-01
影响因子：
5.7
通讯作者：
Long, Yunliang
中科院分区：
文献类型：
--
作者：
Guo, Qi;Long, Yunliang
提出了一种基于Pade（2，2）近似形式的双向抛物方程（2 WPE）方法，用于模拟海洋环境中的双向电磁波（EW）传播。与其它常用的逼近形式相比，Pade（2，2）逼近具有更好的收敛性和精度。为了准确模拟电子战传播在海面附近的反射和折射效应，采用改进的分形海面模型来构造几何粗糙海面。将Pade（2，2）近似PE模型的结果与Miller-Brown模型的结果进行了比较，两者吻合较好。大量的实验证明，2 WPE模型比单向抛物方程模型更准确地预测大规模无线电波在海洋环境中的传播。此外，我们还研究了后向散射电磁波与风速的关系。采用多项式拟合的方法对不同风速和频率下的后向散射电子波的大量采样数据进行了处理。通过对多项式拟合曲线在一定频率范围内的点的准确判断，可以精确确定海面风速。为海洋遥感提供了一种新的理论方法。
This article presents a two-way parabolic equation (2WPE) method based on the Pade(2,2) approximation form, which can model bidirectional electromagnetic wave (EW) propagation in a sea environment. Compared with other common approximation forms, the Pade(2,2) approximation has better convergence and accuracy. To accurately simulate the reflection and refraction effects of EW propagation near the sea surface, an improved fractal sea surface model is used to construct the geometric rough sea surface. The results of the Pade(2,2) approximation PE model are compared with those of the Miller-Brown model, and good agreement is observed. Numerous experiments prove that the 2WPE model is more accurate than the one-way parabolic equation model for predicting large-scale radio wave propagation in marine environments. Furthermore, we investigate the relationship between the backward-scattered EWs and the wind speed. The polynomial fitting method is adopted to process a large amount of sampled data for backward-scattered EWs with different wind speeds and frequencies. Through accurate judgment of the points of the polynomial fitting curve in a certain frequency range, the wind speed over the sea surface can be precisely determined. Thus, this article provides a novel theoretical method for marine remote sensing.