摘要
运用微扰法研究了平面波入射分层介质粗糙面的电磁散射,采用改进的一维分形海面模型模拟实际的分层海面,推导出了平面波入射时的散射系数计算公式。通过数值计算得到了HH极化双站散射系数随散射角的变化曲线,讨论了中间介质介电常数和厚度、摩擦风速和入射波频率对双站散射系数的影响,得到改进的一维分形分层海面散射系数的基本特征、分区特征和随频率变化的特征,结果表明散射系数近似具有"量子化"特征。这些结果在诸如海洋遥感、无线电传播与通信、粗糙面重构等方面中有着广泛的应用。
The electromagnetic scattering from the rough surface of layered medium with incident plane wave was investigated. The small perturbation method was used to derive the formulae of the scattering coefficient from stratified sea surface with an improved 1D fractal model. The angular distribution of the bistaticscattering coefficient of HH polarization were obtained by numerical implementation. Influences of the permittivity and the mean layer thickness of intermediate medium, friction velocity and the frequency of the incident wave on the bistatic scattering coefficient were discussed. The basic characteristics, the zonal characteristics and the characteristics with varying of frequency of the scattering coefficient from stratified sea surface were obtained. The numerical results show that the scattering coefficient has approximate ＂quantization＂ characteristics. These results have broad applications in areas such as sea remote sensing, radio wave propagation and communication, and rough surface reconstruction.
出处
《海洋科学》
CAS
CSCD
北大核心
2010年第4期70-78,共9页
Marine Sciences
基金
中国博士后科学基金(20090461284)
关键词
电磁散射
微扰法
改进的一维分形海面模型
分层介质
双站散射系数
electromagnetic scattering
the small perturbation method
improved one-dimension fractal sea surface model
stratified medium
bistatic scattering coefficient
