BACKSCATTERING FROM A RANDOMLY ROUGH DIELECTRIC SURFACE
BACKSCATTERING FROM A RANDOMLY ROUGH DIELECTRIC SURFACE
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DOI：
10.1109/36.134085
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发表时间：
1992-03-01
影响因子：
8.2
通讯作者：
CHEN, KS
中科院分区：
文献类型：
--
作者：
FUNG, AK;LI, ZQ;CHEN, KS
基于切向表面场积分方程组的近似解，建立了随机粗糙介质表面的后向散射模型。得到了类极化和交叉极化的散射系数。发现类偏振散射系数包含两种类型的项：单散射项和多散射项。结果表明，当粗糙度参数满足微粗糙条件时，类极化散射中的单次散射项可退化为微扰方法的一阶解。当表面粗糙度大而表面斜率小时，只有一个与标准基尔霍夫模型相对应的散射项是有意义的。如果地表坡度较大，多次散射项也很重要。交叉极化后向散射系数满足互易性，且只包含多次散射项。垂直散射系数和水平散射系数之差随介电常数的增大而增大，一般小于一阶小扰动模型的计算值。该模型与统计已知表面的测量结果吻合较好。
A backscattering model for scattering from a randomly rough dielectric surface is developed based on an approximate solution of a pair of integral equations for the tangential surface fields. Both like and cross-polarized scattering coefficients are obtained. It is found that the like polarized scattering coefficients contain two types of terms: single scattering terms and multiple scattering terms. The single scattering terms in like polarized scattering are shown to reduce to the first-order solutions derived from the small perturbation method when the roughness parameters satisfy the slightly rough conditions. When surface roughness are large but the surface slope is small, only a single scattering term corresponding to the standard Kirchhoff model is significant. If the surface slope is large, the multiple scattering term will also be significant. The cross-polarized backscattering coefficients satisfy reciprocity and contain only multiple scattering terms. The difference between vertical and horizontal scattering coefficients is found to increase with the dielectric constant and is generally smaller than that predicted by the first-order small perturbation model. Good agreements are obtained between this model and measurements from statistically known surfaces.