A matrix inversion approach of computing T-matrix for axially   symmetrical particles of extreme shape and dielectrically large   dimension

doi:10.1029/2011RS004906

CORC > 北京大学 > 地球与空间科学学院

	A matrix inversion approach of computing T-matrix for axially symmetrical particles of extreme shape and dielectrically large dimension
	Shen, Xinyi ; Qin, Qiming ; Hong, Yang ; Zhang, Guifu
刊名	radio science
	2012
关键词	LIGHT-SCATTERING ELECTROMAGNETIC SCATTERING NONSPHERICAL PARTICLES MAXWELLS EQUATIONS COMPUTATION EXTINCTION VEGETATION ALGORITHM OBJECTS SPHERES
DOI	10.1029/2011RS004906
英文摘要	The T-matrix method has been widely used in radar meteorology because hydrometeors approximate to spheroidal shapes and their sizes are comparable to the sensing wavelength. However, it is considered unsuitable to solve in remote sensing problems concerning vegetation because the particles of interest, leaves and branches, are considered extremely shaped and of large dielectric dimensions, therefore beyond the domain of direct T-matrix algorithms. By solving two linear equation sets, this paper proposes a matrix inversion approach to calculate indirectly the T-matrix of regularly shaped scatterers in the crown layer of canopies. We adopt an existing electromagnetic (EM) model to calculate the scattering amplitudes as the left hand side of the equations. The number of the unknowns in the equations decreases by almost half, thus reducing the kernel computation to a significant extent when we assume that the particles are symmetrical in most remote sensing applications. The observed consistency between the scattering coefficients computed by the obtained T-matrix and those by the EM model indicates that the valid aspect ratio of this proposed method spans from 0.02 to 200, although this ratio may possibly extend with further verification. The proposed T-matrix calculation method can work at either the far-zone or the near-zone. However, it should be noted that the T-matrix obtained in the far-zone could not yield correct scattering results in the near-zone; on the contrary, the T-matrix obtained from the near-zone can produce accurate scattering fields/coefficients in what is further than the region of matching.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000309137500001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications; SCI(E); EI; 3; ARTICLE; 4; 47
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155689]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Shen, Xinyi,Qin, Qiming,Hong, Yang,et al. A matrix inversion approach of computing T-matrix for axially symmetrical particles of extreme shape and dielectrically large dimension[J]. radio science,2012.
APA	Shen, Xinyi,Qin, Qiming,Hong, Yang,&Zhang, Guifu.(2012).A matrix inversion approach of computing T-matrix for axially symmetrical particles of extreme shape and dielectrically large dimension.radio science.
MLA	Shen, Xinyi,et al."A matrix inversion approach of computing T-matrix for axially symmetrical particles of extreme shape and dielectrically large dimension".radio science (2012).