海洋粗糙面全極化電磁散射特性研究

王童; 童創(chuàng)明; 李西敏; 姬偉杰

doi:10.11999/JEIT170924

海洋粗糙面全極化電磁散射特性研究

doi: 10.11999/JEIT170924

1.
(空軍工程大學防空反導學院西安 710051) ②(空軍西安飛行學院西安 710036)

基金項目:

國家自然科學基金(61372033)

計量
- 文章訪問數(shù): 1313
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-09-29
- 修回日期: 2018-01-16
- 刊出日期: 2018-06-19

Research on the Full Polarimetric Electromagnetic Scattering Characteristics of Ocean Rough Surface

1.
(Air Force Engineering University, Xi&rsquo
2.
(Air Force Xi&rsquo

Funds:

The National Natural Science Foundation of China (61372033)

摘要

摘要: 針對基于幾何光學-微擾法(GO-SPM)的傳統(tǒng)雙尺度模型對截斷波數(shù)敏感的問題，該文建立了一種基于幾何光學-小斜率近似(GO-SSA)的改進雙尺度模型。該模型將小尺度部分的微擾法替換為一階小斜率近似，并改進鏡向分量的幾何光學解。仿真表明該方法在獲取傳統(tǒng)雙尺度精度的同時，不需要考慮截斷波數(shù)的選取問題。針對Elfouhaily海浪譜模型的特點，簡化GO-SSA積分形式。最后采用GO-SSA對以Elfouhaily海浪譜建模的海表面的單雙站極化散射特性進行了仿真分析。發(fā)現(xiàn)雙站極化散射中，粗糙表面的斜率調制導致交叉極化出現(xiàn)了異于傳統(tǒng)模型的分布。同時在全空域的雙站極化散射仿真中，發(fā)現(xiàn)所有的極化方式在方位向內均存在極小值。該極小值的大小與環(huán)境參數(shù)密切相關，在環(huán)境參數(shù)反演方面具有應用潛力。
- 雙尺度 /
- 小斜率近似 /
- 極化散射 /
- 雙站
Abstract: Considering the fact that the classical two scale model which is based on the Geometrical Optics-Small Perturbation Method (GO-SPM) is sensitive to the cut-off wave number, a two scale model derived from the Geometrical Optics-Small Slope Approximation (GO-SSA) is established. In this model, the SPM in the classical two scale model is replaced by the first order Small Slope Approximation (SSA1). At the same time, the solution of geometrical optics for specular contribution is modified. The simulations show that GO-SSA can get the same accuracy as GO-SPM while do not need to consider the choice of cut-off wave number. The integral equation of GO-SSA is simplified based on the characteristics of Elfouhaily wave spectrum. At last, the full polarimetric scattering characteristics of Elfouhaily ocean model in monostatic and bistatic cases are simulated and analyzed. It can be found that the results of cross polarization present an interesting distribution with variation of angles which is different from classical models. In the three-dimensional results of bistatic scattering, the scattered direction with minimum value always exists in every polarization form. The value of the scattering power in this direction has relationship with the parameters of the environment, which has a potential application to the parameter inversion.
- Two scale /
- Small Slope Approximation (SSA) /
- Polarimetric scattering /
- Bistatic

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