沙丘粗糙面的二次极化电磁散射

刘伟; 郭立新; 孟肖; 郑帆

doi:10.7498/aps.62.144213

摘要

研究了新月形沙丘粗糙面的二次极化电磁散射. 结合射线追踪理论, 由一次散射面元的反射场照射到二次散射面元, 采用基尔霍夫近似推导了二次散射面元的二次极化散射场. 计算结果表明二次极化散射结果在特定的角度和类型范围内有显著影响. 在电磁波射向背风坡时可以发现其同极化散射截面在入射角较大时大于其他入射方向的结果, 入射角在休止角附近时的交叉极化散射截面出现峰值, 以及前后狭长沙丘之间的二次极化散射特别突出. 本文结果可用于反演分析沙漠地区的风场信息.

关键词:

Abstract

Secondary electromagnetic polarimetric scattering from a barchan dune is studied. The secondary polarimetric scattering field from the secondary scattering facet is deduced in the Kirchhoff approximation with the waves reflecting from the first scattering facet based on the Ray-tracing theory. The results show that secondary scattering plays an important role in specific range of angle. The co-polarized backscattering coefficients of the lee slope have a local peak value when the incident angle equals the repose angle. Cross-polarized bistatic coefficient of the lee slope near the backscattering region is enhanced when the incident angle is close to the repose angle. The secondary polarimetric scattering between two dunes in line is especially noticeable. The information about wind field in desert region can be retrieved and analyzed by the results in this paper.

Keywords:

作者及机构信息

1.
西安电子科技大学理学院, 西安 710071

基金项目: 国家杰出青年科学基金(批准号: 61225002);高等学校博士学科点专项科研基金(批准号: 20100203110016)和中央高校基本科研业务费(批准号: K50510070001,K5051307016))资助的课题.

Authors and contacts

1.
School of Science Xidian University, Xi'an 710071, China

Funds: Project supported by the National Natural Science Foundation for Distinguished Young Scholars of China (Grant No. 61225002), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20100203110016), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. K50510070001, K5051307016).

参考文献

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施引文献

[1]	Parteli E J R, Herrmann H J 2007 Phys. Rev. E 76 041307-1
[2]	Le Gall A, Hayes A G, Ewing R, Janssen M A, Radebaugh J, Savage C, Encrenaz P 2012 Icarus 217 231
[3]	Bagnold R A 1941 The Physics of Blown Sand and Desert Dunes (London: Methuen)
[4]	Stephen H, Long D G 2005 IEEE Trans. Geosci. Remote Sens. 43 238
[5]	Nashashibi A Y, Sarabandi K, Al-Zaid F A, Alhumaidi S 2012 IEEE Trans. Geosci. Remote Sens. 50 2345
[6]	Li Y Z, Shi Q F, Wang Q 2006 Acta Phys. Sin. 55 1119 (in Chinese) [李运周, 史庆藩, 王琪 2006 55 1119]
[7]	Liang Z C, Jin Y Q 2003 Acta Phys. Sin. 52 1319 (in Chinese) [梁子长, 金亚秋 2003 52 1319]
[8]	Wang X B, Wu Z S, Liang Z C, Zhang Y 2012 Acta Phys. Sin. 61 244105 (in Chinese) [王晓冰, 吴振森, 梁子长, 张元 2012 61 244105]
[9]	Karnieli A, Cierniewski J 2001 Adv. Space Res. 28 171
[10]	El-Shenawee M, Bahar E 1996 Rev. Proc. Appl. Comput. EM. 1 205
[11]	Ishimaru A, Chen J S 1990 J. Acou. Soc. A 88 1877
[12]	Yoon K Y, Tateiba M, Uchida K 2001 IEICE Trans. Electron. E84-C 267
[13]	Honda J, Uchida K, Yoon K Y 2010 IEICE Trans. Electron. E93-C 39
[14]	Bourlier C, Berginc G 2004 Waves Random Media 14 229
[15]	Xu F, Jin Y Q 2009 IEEE Trans. Antennas Prop. 57 1495
[16]	Miao T D, Mu Q S, Wu S Z 2001 Phys. Lett. A 288 16
[17]	Moller T, Trumbore B 1997 J. Graphics Tools 2 109
[18]	Ren Y C, Guo L X 2006 Syst. Eng. Electron. Technol. 28 495 (in Chinese) [任玉超, 郭立新 2006 系统工程与电子技术 28 495]
[19]	Fornaro G, Serafino F 2006 IEEE Trans. Geosci. Remote Sens. 44 3497
[20]	Liu W, Guo L X, Wu Z S 2010 Chin. Phys. B 19 0741021

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