基于二维粗糙面模型的大地土壤表面散射特性研究  

Study on the EM Scattering from the Earth Surface Based on the 2D Rough Surface Model

作　　者：彭鹏[1] 童创明[1,2] 鲍峻松[1] 孙佳佳[1] 李丹[1] 

机构地区：[1]空军工程大学防空反导学院,西安710051 [2]毫米波国家重点实验室,南京210096

出　　处：《微波学报》2013年第4期38-42,共5页Journal of Microwaves

基　　金：毫米波国家重点实验室基金项目(K201201);陕西省自然科学研究计划(2011JM8025)

摘　　要：建立二维粗糙面模型研究了大地土壤表面对高频超视距雷达电磁波的散射特性。采用半经验公式计算了HF频段给定频率下土壤媒质在不同温度、湿度时的有效相对介电常数,并与微波频段下情形进行对比。采用Monte Carlo法结合高斯谱函数生成二维粗糙面模拟真实大地土壤表面,建立了土壤表面积分方程,采用锥形波入射消除人为截断粗糙面带来的边缘衍射,采用基于物理意义的双网格法(Physics Based Two Grid,PBTG)结合稀疏网格迭代法(Sparse Matrix Canonical Grid,SMCG)求解土壤表面的双站散射系数。研究了不同温度和湿度条件下,大地土壤表面对高频超视距雷达电磁波的散射特性。研究结果为高频超视距雷达遥感探测提供了理论参考。2D rough surface model is used to study over the horizon radar EM scattering from the earth surface. The effective dielectric constants are calculated by semi-empirical formula in the cases of different temperature, humidity at given frequencies of HF band and microwave band. The 2D rough surface model is generated using Monte Carlo method with Gaussian spectral function to simulate the real earth surface. Surface integral equation is derived with the Tapered incident wave applied to eliminate the edge diffraction. PBTG/SMCG algorithm is used to calculate the bistatie scattering coefficient. Studies have been done on over the horizon radar EM scattering from the earth surface. The study conclusion provides refer- ences for over the horizon radar remote sensing.

关 键 词：大地土壤表面 粗糙面 电磁散射 基于物理的双网格法 稀疏网格迭代法(PBTG SMCG) 

分 类 号：TN953[电子电信—信号与信息处理]