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土壤表面与置于其上组合目标复合电磁散射特性研究

任新成 刘鹏 朱小敏 杨鹏举 赵晔

引用本文: 任新成, 刘鹏, 朱小敏, 杨鹏举, 赵晔. 土壤表面与置于其上组合目标复合电磁散射特性研究[J]. 电子与信息学报, doi: 10.11999/JEIT190645 shu
Citation:  Xincheng REN, Peng LIU, Xiaomin ZHU, Pengju YANG, Ye ZHAO. Study on the Characteristics of Composite Electromagnetic Scattering From Soil Surface and Combinatorial Target Placed on It[J]. Journal of Electronics and Information Technology, doi: 10.11999/JEIT190645 shu

土壤表面与置于其上组合目标复合电磁散射特性研究

    作者简介: 任新成: 男,1967年生,教授,研究方向为环境与目标的电磁波散射与传播、计算电磁学、时域有限差分方法、矩量法;
    刘鹏: 男,1971年生,副教授,研究方向为环境与目标的电磁波散射与传播、海洋与舰船SAR遥感、计算电磁学、有限元方法;
    朱小敏: 男,1975年生,副教授,研究方向为环境与目标的电磁波散射与传播、时域有限差分方法、矩量法;
    杨鹏举: 男,1984年生,讲师,研究方向为环境与目标的电磁波散射与传播、时域有限差分方法、矩量法;
    赵晔: 女,1987年生,讲师,研究方向为环境与目标的电磁波散射与传播、时域有限差分方法、矩量法
    通讯作者: 任新成,xchren@yau.edu.cn
  • 基金项目: 国家自然科学基金(61861043, 61701428, 61801416),陕西省教育厅科研计划项目(17JK0860),复旦大学电磁波信息科学教育部重点实验室开放基金(EMW201910)

摘要: 为了满足置于粗糙面之上组合目标测量和检测的需要,该文分别采用Dobson半经验模型和电介质复介电常数公式表示土壤介电常数的实部和虚部,应用指数型分布粗糙面和Monte Carlo方法模拟实际的土壤表面。通过与矩量法得到的计算结果比较,验证了时域有限差分方法计算粗糙面与目标复合散射问题的有效性,进而运用该方法研究了土壤表面与置于其上组合目标的复合散射,得出了复合散射系数的角分布曲线。结果表明:复合散射系数随散射角振荡地变化,在镜反射方向处发生散射增强效应;土壤表面高度起伏均方根越大,复合散射系数越大;相关长度越大,复合散射系数越小;湿度越大,复合散射系数越小;组合目标尺度、介电常数、入射角对复合散射系数影响比较复杂。该文结果可用于求解地、海粗糙面与置于其上任意目标的复合电磁散射问题,与其它数值计算方法相比较,采用时域有限差分方法既可获得较高的准确性,同时又可减少计算时间和内存占用量。

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  • 图 1  土壤表面与置于其上组合目标复合散射几何示意图

    图 2  土壤表面与置于其上组合目标复合散射计算的FDTD模型

    图 3  粗糙面与目标复合散射FDTD,MOM数值仿真结果比较

    图 4  FDTD与MOM仿真结果绝对误差分布

    图 5  土壤介电常数实部随土壤湿度变化曲线

    图 6  土壤表面均方根对复合散射系数的影响

    图 7  土壤表面相关长度对复合散射系数的影响

    图 8  土壤湿度对复合散射系数的影响

    图 9  目标尺度对复合散射系数的影响

    图 10  目标介电常数对复合散射系数的影响

    图 11  入射角对复合散射系数的影响

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文章相关
  • 通讯作者:  任新成, xchren@yau.edu.cn
  • 收稿日期:  2019-08-27
  • 录用日期:  2020-04-08
  • 网络出版日期:  2020-05-07
通讯作者: 陈斌, bchen63@163.com
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