土壤表面與置于其上組合目標復合電磁散射特性研究

任新成; 劉鵬; 朱小敏; 楊鵬舉; 趙曄

doi:10.11999/JEIT190645

土壤表面與置于其上組合目標復合電磁散射特性研究

doi: 10.11999/JEIT190645 cstr: 32379.14.JEIT190645

任新成^{1, 2, ,},
劉鵬²,
朱小敏¹,
楊鵬舉¹,
趙曄¹

1.
延安大學物理與電子信息學院延安 716000
2.
復旦大學電磁波信息科學教育部重點實驗室上海 200433

基金項目: 國家自然科學基金(61861043, 61701428, 61801416)，陜西省教育廳科研計劃項目(17JK0860)，復旦大學電磁波信息科學教育部重點實驗室開放基金(EMW201910)

詳細信息

作者簡介:
任新成：男，1967年生，教授，研究方向為環(huán)境與目標的電磁波散射與傳播、計算電磁學、時域有限差分方法、矩量法

劉鵬：男，1971年生，副教授，研究方向為環(huán)境與目標的電磁波散射與傳播、海洋與艦船SAR遙感、計算電磁學、有限元方法

朱小敏：男，1975年生，副教授，研究方向為環(huán)境與目標的電磁波散射與傳播、時域有限差分方法、矩量法

楊鵬舉：男，1984年生，講師，研究方向為環(huán)境與目標的電磁波散射與傳播、時域有限差分方法、矩量法

趙曄：女，1987年生，講師，研究方向為環(huán)境與目標的電磁波散射與傳播、時域有限差分方法、矩量法

通訊作者:
任新成　xchren@yau.edu.cn

中圖分類號: TN011
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- 文章訪問數(shù): 2277
- HTML全文瀏覽量: 1023
- PDF下載量: 66
- 被引次數(shù): 0
出版歷程
- 收稿日期: 2019-08-27
- 修回日期: 2020-04-08
- 網(wǎng)絡出版日期: 2020-05-07
- 刊出日期: 2020-11-16

Study on the Characteristics of Composite Electromagnetic Scattering From Soil Surface and Combinatorial Target Placed on It

1.
School of Physics and Electronic Information, Yan’an University, Yan’an 716000, China
2.
Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China

Funds: The National Natural Science Foundation of China (61861043, 61701428, 61801416), The Scientific Research Projects of Shaanxi Education Department (17JK0860), The Open Foundation of Fudan University Key Laboratory for Information Science of Electromagnetic Waves (MoE) (EMW201910)

摘要

摘要: 為了滿足置于粗糙面之上組合目標測量和檢測的需要，該文分別采用Dobson半經驗模型和電介質復介電常數(shù)公式表示土壤介電常數(shù)的實部和虛部，應用指數(shù)型分布粗糙面和Monte Carlo方法模擬實際的土壤表面。通過與矩量法得到的計算結果比較，驗證了時域有限差分(FDTD)方法計算粗糙面與目標復合散射問題的有效性，進而運用該方法研究了土壤表面與置于其上組合目標的復合散射，得出了復合散射系數(shù)的角分布曲線。結果表明：復合散射系數(shù)隨散射角振蕩地變化，在鏡反射方向處發(fā)生散射增強效應；土壤表面高度起伏均方根越大，復合散射系數(shù)越大；相關長度越大，復合散射系數(shù)越??；濕度越大，復合散射系數(shù)越?。唤M合目標尺度、介電常數(shù)、入射角對復合散射系數(shù)影響比較復雜。該文結果可用于求解地、海粗糙面與置于其上任意目標的復合電磁散射問題，與其它數(shù)值計算方法相比較，采用時域有限差分方法既可獲得較高的準確性，同時又可減少計算時間和內存占用量。
- 復合散射 /
- 時域有限差分方法 /
- 土壤表面 /
- 組合目標
Abstract: In order to meet the needs of measuring and detecting combinatorial target placed on the rough surface, Dobson semi-empirical model and dielectric complex permittivity formula are used to represent the real and imaginary parts of the soil dielectric constant, the soil surface is simulated with the model of exponential distribution and Monte Carlo method. The strategy of the Finite Difference Time Domain (FDTD) method for calculating the composite scattering from rough surface with target and the modeling method are presented with their validity evaluated by the method of moment, then the composite scattering of soil surface and combinatorial target placed on it is studied by this method, the angular distribution curve of the composite scattering coefficient is obtained. The results show that the composite scattering coefficient oscillates with the scattering angle, and the scattering enhancement effect occurs in the mirror reflection direction; the larger the root mean square of the fluctuation of soil surface, the larger the composite scattering coefficient; the larger the correlation length, the smaller the composite scattering coefficient; the larger the soil moisture content, the smaller the composite scattering coefficient; the influence of the scale and dielectric constant of combinatorial target, incident angle on composite scattering coefficient is complex. The results obtained in this paper can be used to solve the composite electromagnetic scattering from rough land surface and rough sea surface with any target placed on it. Compared with other numerical methods, the finite difference time domain method can not only obtain higher accuracy, but also reduce the calculation time and the amount of memory occupying.
- Composite electromagnetic scattering /
- Finite Difference Time Domain (FDTD) method /
- Soil surface /
- Combinatorial target

HTML全文

圖 1 土壤表面與置于其上組合目標復合散射幾何示意圖

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圖 2 土壤表面與置于其上組合目標復合散射計算的FDTD模型

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圖 3 粗糙面與目標復合散射FDTD, MoM數(shù)值仿真結果比較

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圖 4 FDTD與MoM仿真結果絕對誤差分布

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圖 5 土壤介電常數(shù)實部隨土壤濕度變化曲線

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圖 6 土壤表面均方根對復合散射系數(shù)的影響

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圖 7 土壤表面相關長度對復合散射系數(shù)的影響

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圖 8 土壤濕度對復合散射系數(shù)的影響

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圖 9 目標尺度對復合散射系數(shù)的影響

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圖 10 目標介電常數(shù)對復合散射系數(shù)的影響

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圖 11 入射角對復合散射系數(shù)的影響

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