粗糙海面电磁散射的小斜率近似方法

Journal of Systems Engineering and Electronics ›› 2009, Vol. 31 ›› Issue (8): 1814-1818.

粗糙海面电磁散射的小斜率近似方法

杨超, 郭立新

西安电子科技大学理学院, 陕西, 西安, 710071

收稿日期:2008-04-14 修回日期:2008-08-10 出版日期:2009-08-20 发布日期:2010-01-03
作者简介:杨超(1984- ),男,博士研究生,主要研究方向为粗糙表面电磁散射各类近似,快速数值计算.E-mail:yang_chaomail@163.com
基金资助:
国家自然科学基金(60571058);高等学校博士学科点专项科研基金(20070701010)资助课题

Electromagnetic scattering from rough sea surface using small slope approximation

YANG Chao, GUO Li-xin

School of Science, Xidian Univ., Xi'an 710071, China

Received:2008-04-14 Revised:2008-08-10 Online:2009-08-20 Published:2010-01-03

摘要/Abstract

摘要： 利用小斜率近似方法研究了粗糙海面的电磁散射特性,推导了极坐标下小斜率近似方法的双站散射系数计算公式.基于Elfouhaily海谱模型,计算了海面的散射系数,将得到的理论计算结果和实验数据及考虑和不考虑遮蔽效应的基尔霍夫近似结果进行了对比.讨论了不同极化状态下小斜率近似方法的后向散射系数随入射波频率和风速的变化关系.结果表明,在后向散射情况下,理论计算结果和实验数据吻合很好;在双站散射情况下,在大散射角时小斜率近似的结果更为准确;无论是何种极化,后向散射系数均随入射波频率和风速的增大而增大.

Abstract: The small slope approximation method is used to investigate the electromagnetic scattering properties of rough sea surface,and the bistatic scattering coefficient of the small slope approximation is derived in the polar coordinates.Based on the spectral model of Elfouhaily,the scattering coefficient of sea surface is calculated,and the theoretical results are compared with the experimental data and Kirchhoff approximation with or without shadowing effect considered.The dependence of the backscattering coefficient of the small slope approximation on the incident wave frequency and the wind speed in different polarization conditions is discussed.The results show that the theoretical results are consistent with the experimental data in backscattering case.In the case of the bistatic scattering,the result of the small slope approximation is accurate,especially for large scattering angle.The backscattering coefficient increases with increasing of the incident wave frequency and the wind speed in both horizontal and vertical polarization.

中图分类号:

TN011

杨超, 郭立新. 粗糙海面电磁散射的小斜率近似方法[J]. Journal of Systems Engineering and Electronics, 2009, 31(8): 1814-1818.

YANG Chao, GUO Li-xin. Electromagnetic scattering from rough sea surface using small slope approximation[J]. Journal of Systems Engineering and Electronics, 2009, 31(8): 1814-1818.

参考文献

[1] Wentz F J.Measurement of oceanic wind vector using satellite microwave radiometers[J].IEEE Trans,on Geosci.Remote Sensing,1992,30:960-972.
[2] Nghiem S V,Fuk K L.The dependence of ocean backscatter at Ku-band on oceanic and atmospheric parameters[J].IEEE Trans.on Geosci.Remote Sensing,1997,35:581-600.
[3] Thorsos E I.The validity of the kirchhoff approximation for rough surface scattering using a Gaussian roughness spectrum[J].J Acoust Soc Am,1988,83,78-92.
[4] Thorsos E I,Jackson D R.The validity of the perturbation approximation for surface scattering using a Gaussian roughness spectrum[J].J Acoust Soc Am,1989,86.261-277.
[5] Khenchaf A,Daout F,Saillard J.The two-scale model for random rough surface scattering[C]//OCEANS.MTS/IEEE.'Prospects for the 21st Century'.Conference Proceedings,1996,2:887-891.
[6] Fung A K,Lee K.A semi-empirical sea-spectrum model for scattering coefficient estimation[J].IEEE J.Oceanic Engineering,1982,7:166-176.
[7] Voronovich A G.The small slope approximation in wave scattering by rough surfaces[J].Sov.Phys.-JETP,1985,62:65-70.
[8] 郭立新,陈建军,韦国晖,等.糨糙面电磁散射的小斜率近似方法研究[J].西安电子科技大学学报+2005,32:408-413.
[9] Elfouhaily T,Chapron B,Katsaros K,et al.A unified directional spectrum for long and short wind-drived waves[J].J.Geophys.Res.,1997,102:15781-15796.
[10] Bourlier C,Saillard J,Berginc G.Intrinsic infrared radiation of the sea surface[J].PIER,2000,27:185-335.
[11] Thorsos E I,Broschat S L.An investigation of the small slope approximation for scattering from rough surfaces:part Ⅰ-theory[J].J.Acoust Soc.Am.,1995,97:2082-2093.
[12] Voronovich A G.Wave scattering from rough surfaces[M].Berlin:Springer-Verlag,1994.
[13] Bourlier C.Azimuthal harmonic coefficients of the microwave backscattering from a non-Gaussian ocean surface with the firstorder SSA model[J].IEEE Trans,on Geosci.Remote Sensing,2004,42:2600-2611.
[14] Voronovich A G.Small slope approximation for electromagnetic wave scattering at a rough interface of two dielectric half-spaces[J].Waves in Random Media,1994,4:337-367.
[15] Ulaby F T,Moore R K,Fung A K.Microwave remote sensing[M].London:Addison Wesley Publishing,1982:816-1033.
[16] McDaniel S T.Small slope predictions of microwave backscatter from the sea surface[J].Waves in Random Media,2001,11:343-360.
[17] Bourlier C,Berginc G,Saillard J.Bistatic scattering coefficient from one-and two-dimensional random surfaces using the stationary phase and scalar approximation with shadowing effect:comparisons with experimentals and application to the sea surface[J].Waves in Random Media,2001,11:119-149.