雷达学报Issue(5)：560-570,11.DOI:10.12000/JR15067
一种改进的随机粗糙地表的双尺度微波散射模型研究
A Modified Two-scale Microwave Scattering Model for a Dielectric Randomly Rough Surface
摘要
Abstract
In this paper, we present a Modified Two-Scale Microwave (MTSM) scattering model to describe the scattering coefficient of naturally rough surfaces. The surface roughness is assumed to be Gaussian in the pro-posed model so that the surface heightz(x,y) can be split into large- and small-scale components by the wave-let packet transform according to electromagnetic wavelength. We used the Kirchhoff Model(KM) and Small Perturbation Method (SPM) to estimate the backscattering coefficient of large- and small-scale roughness, re-spectively. The tilting effect caused by the slope of large-scale roughness was corrected when calculating the contribution of backscattering to small-scale roughness. The backscattering coefficient of the MTSM comprised the total backscattering contributions of surfaces with both scales of roughness. The MTSM was tested and val-idated using the Advanced Integral Equation Model (AIEM) for dielectric randomly rough surfaces. The accur-acy of the MTSM showed favorable agreement with AIEM, both when the incident angle was less than 30° (qi<30°) and when the surface roughness was small (ks=0.354).关键词
双尺度模型/粗糙地表/散射模型/小波包变换/AIEMKey words
Two-scale model/Rough surface/Backscattering model/Wavelet packet transform/Advanced Integ-ral Equation Model (AIEM)分类
信息技术与安全科学引用本文复制引用
余凡,袁捷..一种改进的随机粗糙地表的双尺度微波散射模型研究[J].雷达学报,2015,(5):560-570,11.基金项目
Supported by the National Key Basic Research Program of China (2013CB733400), the National Natural Science Foundation of China (Grant Number:41471299), and the Key Projects in the National Science and Technology Pillar Program (2012BAH28B03) （2013CB733400）
