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为了探究典型粗糙面上随机粒子层中能量传输的多次散射机制, 提出了一种基于矢量辐射传输方程的建模二阶计算方法. 该建模方法将建模场景(粗糙面上粒子层)在高度维(Z轴)划分为多个传输散射层, 基于矢量辐射传输理论中的一阶迭代散射解, 利用典型粗糙面的半经验半解析方法, 求解出整个场景的二阶迭代散射解. 同时, 研究粒子层能量在粒子与粒子间的多次散射机制, 以及粒子与地表粗糙面间的多次散射机制. 数值结果表明, 该二阶迭代解法相较于矢量辐射传输方程的一阶迭代散射解, 能够更完整地探究互作用的散射特性, 且可从能量传输角度解译建模场景中物体间的相干作用, 从而可用于植被地物环境下的多次散射机制的解析以及散射系数变化趋势的预估.In order to investigate the multiple scattering characteristics of energy transmission in a random particle layer on a typical rough surface, a high-order iterative method based on radiative transfer equation is proposed in this work. The particles are placed on the rough surface and the height dimension (Z-axis) is divided into several layers. Then the high-order iterative solution can be obtained by using the first-order iteration solution of radiative transfer equation and the rough surface theory. Moreover, the multiple scattering characteristics between particles, as well as between particles and rough surface can be obtained. Numerical results show that the multiple scattering characteristics can be better explored by the proposed high-order iterative method than by the first-order iteration method. All these interactions can be explained by the energy transfer theory. The proposed high-order iterative method can be used as an efficient tool to explain the multiple scattering characteristics and predict the change of the scattering coefficients.
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Keywords:
- vector radiative transfer equation /
- iterative solution /
- second-order /
- multiple scattering characteristics
[1] Ulaby F T, David G L 2014 Microwave Radar and Radiometric Remote Sensing (USA: University of Michigan Press)
[2] Tsang L, Kong J A, Shin R T 1985 Theory of Microwave Remote Sensing (USA: Wiley-Interscience Publication)
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Google Scholar
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Google Scholar
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图 1 粗糙面上粒子层模型示意图, 图中为层厚为d1的粒子层, 最下层为随机粗糙面模型, 绿色部分为粒子层中椭球粒子模型, 深色部分为圆柱粒子模型
Fig. 1. Particle layer model on rough surface. The figure shows the particle layer with layer thickness of d1, the bottom layer is the random rough surface model, the green parts is the ellipsoid particle model in the particle layer, and the dark parts is the cylinder particle model.
图 2 VRT方程各项散射机制示意图. 图中最上层为粗糙面模型, 绿色部分表示粒子层随机分布的粒子模型, 粒子层层厚为d1,
$ {{\boldsymbol{M}}_i} $ 为VRT方程不同散射机制Muller矩阵解Fig. 2. Various scattering mechanisms of VRT equation. In the figure, the top layer is the rough surface model, and the green parts represent the particle model with random distribution of particle layers. The thickness of particle layers is d1, and
$ {{\boldsymbol{M}}_i} $ is the solution of Muller matrix with different scattering mechanism of VRT equation.
图 3 粒子层多次散射过程示意图 (a) (粒子-粒子)二次散射机制示意图; (b) (粒子-粒子-粗糙面)三次散射机制示意图; (c) (粗糙面-粒子-粒子)三次散射机制示意图; (d) (粒子-粗糙面-粒子)三次散射机制示意图
Fig. 3. Diagram of multiple scattering process of particle layer: (a) (Particle-particle) secondary scattering mechanism; (b) (particle-particle-rough surface) third-order scattering mechanism; (c) (rough surface-particle-particle) third-order scattering mechanism; (d) (particle-rough surface- particle) third-order scattering mechanism.
图 4 不同形态粒子的粒子层后向散射系数对比 (a)取向角均匀椭球粒子层同极化后向散射系数; (b)竖直圆柱粒子层的同极化后向散射系数; (c)固定倾斜角圆柱粒子层的同极化后向散射系数; (d)取向角均匀椭球粒子层的交叉极化后向散射系数; (e)竖直圆柱粒子层的交叉极化后向散射系数; (f)固定倾斜角粒子层的交叉极化后向散射系数.
Fig. 4. Backscattering coefficients of particle layers with different morphology particles: (a) Co-polarization backscattering coefficient of a layer of ellipsoid particles with uniform orientation angles; (b) the co-polarization backscattering coefficient of a layer of vertical cylindrical particles; (c) the co-polarization backscattering coefficient of a layer of cylindrical particles with fixed inclination angles; (d) the cross-polarization backscattering coefficient of a layer of ellipsoid particles with uniform orientation angles; (e) the cross-polarization backscattering coefficient of the vertical cylindrical particle layer; (f) the cross-polarization backscattering coefficient of the particle layer with a fixed inclination angle.
图 5 混合粒子的同极化散射系数对比
Fig. 5. Comparison of co-polarization scattering coefficients of mixed particles.
图 6 混合粒子的交叉极化散射系数对比
Fig. 6. Comparison of cross-polarization scattering coefficients of composite particles.
图 7 不同占空比下粒子层的同极化散射系数对比
Fig. 7. Comparison of the co-polarization scattering coefficients of particle layers with different duty cycles.
图 8 不同占空比下粒子层的交叉极化散射系数对比
Fig. 8. Comparison of cross-polarization scattering coefficients of particle layers with different duty cycles.
图 10 仿真结果和实测数据对比图
Fig. 10. Comparison diagram of simulation results and measured data.
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[1] Ulaby F T, David G L 2014 Microwave Radar and Radiometric Remote Sensing (USA: University of Michigan Press)
[2] Tsang L, Kong J A, Shin R T 1985 Theory of Microwave Remote Sensing (USA: Wiley-Interscience Publication)
[3] Tsang L, Ding K H 1991 IEEE Trans. Geosci. Remote Sen. 29 242
Google Scholar
[4] Jin Y Q 1993 Electromagnetic Scattering Modelling for Quantitative Remote Sensing (Singapore: World Scientific Publication)
[5] Jin Y Q 2006 Theory and Approach of Information Retrievals from Electromagnetic Scattering and Remote Sensing (Netherlands: Springer)
[6] Shin R T, Kong J A 1981 J. Appl. Phys. 52 4221
Google Scholar
[7] Jin Y Q, Chang M 2002 3rd International Conference on Microwave and Millimeter Wave Technology, Beijing, China, August 17–19, 2002 p7508398
[8] Chang M, Jin Y Q 2002 J. Quantitative Spectrosco. Rad. Transfer 74 339
Google Scholar
[9] 常梅, 金亚秋 2002 51 74
Google Scholar
Chang M, Jin Y Q 2002 Acta Phys. Sin. 51 74
Google Scholar
[10] Fung A K, Li Z, Chen K S, et al. 1992 IEEE Trans. Geosci. Remote Sen. 30 356
Google Scholar
[11] 徐丰, 金亚秋 2005 微波学报 21 1
Google Scholar
Xu F, Jin Y Q 2005 J. Microwaves 21 1
Google Scholar
[12] Fa W Z, WieczorekM A, Heggy E 2011 J. Geophys. Res. 116 E03005
Google Scholar
[13] Xu F 2013 Polarimetric Scattering and SAR Information Retrieval (Singapore: John Wiley & Sons)
[14] Liang Z C 2003 J. Quantitative Spectrosco. Rad. Transfer 77 1
Google Scholar
[15] 梁子长, 金亚秋 2003 52 247
Google Scholar
Liang Z C, Jin Y Q 2003 Acta Phys. Sin. 52 247
Google Scholar
[16] 张元元 2017 博士学位论文 (西安: 西安电子科技大学)
Zhang Y Y 2017 Ph. D. Dissertation (Xi'an: Xidian University) (in Chinese)
[17] Ulaby F T, Sarabandi K, McDonald K, et al. 1990 Int. J. Remote Sens. 11 1223
Google Scholar
[18] 王宏坤 2015 硕士学位论文 (南京: 东南大学)
Wang H K 2015 M. S. Thesis (Nanjing: Southeast University) (in Chinese)
[19] Karam M A 1989 IEEE Trans. Geosci. Remote. Sen. 27 687
Google Scholar
[20] Karam M A, Fung A K 1988 Int. J. Remote Sens. 9 1109
Google Scholar
[21] Wu T D, Chen K S 2008 IEEE Trans. Geosci. Remote Sen. 46 2584
Google Scholar
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