ELECTROMAGNETIC SCATTERING BY ROUGH SURFACES WITH LARGE HEIGHTS AND SLOPES WITH APPLICATIONS TO MICROWAVE REMOTE SENSING OF ROUGH SURFACE OVER LAYERED MEDIA

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题名:	ELECTROMAGNETIC SCATTERING BY ROUGH SURFACES WITH LARGE HEIGHTS AND SLOPES WITH APPLICATIONS TO MICROWAVE REMOTE SENSING OF ROUGH SURFACE OVER LAYERED MEDIA
作者:	Liang,D;Xu,P;Tsang,L;Gui,Z;Chen,KS
贡献者:	電機工程研究所
关键词:	GREENLAND;FIRN
日期:	2009
上传时间:	2010-06-29 20:20:14 (UTC+8)
出版者:	中央大學
摘要:	In this paper, we study the bistatic reflection and transmission properties of random rough surface with large slope and large height. Method of Moment (MOM) is used to solve the surface integral equations for 2D rough surface scattering problem. The modeled rough surfaces are similar to random rectangular grating, so that there are large slopes on the surface. The motivation of the study is to analyze scattering by sastrugi surface in Polar Regions. The ridges on the sastrugi surface have heights of about 20 cm. In microwave remote sensing of land at 5 GHz, 10 GHz, 19 GHz and 37 GHz, these heights are larger than wavelength. Next, we consider the scattering problem of the sastrugi rough surface over multi-layered snow. The bistatic reflection and transmission coefficients from MOM solutions are used as the boundary conditions for multilayered radiative transfer equations. The radiative transfer equations are solved and the reflectivities are calculated. Numerical results are illustrated as a function of roughness and multi-layered parameters. We demonstrate that rough surface of sastugi, when interactions with layered media, causes increase in reflectivity and the decrease in emissivity. The increase of reflectivity can be attributed to the fact that rough surface with large slope facilitates large angle transmission. The large angle transmission results in increase of subsurface reflection and the possibility of total internal reflection in layered media below the rough surface.
關聯:	PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER
显示于类别:	[電機工程研究所] 期刊論文

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