Scattering models for some vegetation samplesThe Helmholtz integral equation is presently derived for a scatterer of arbitrary shape, and reduced in order to obtain the far zone-scattered field in terms of the field within the scatterer. Attention is given to the effect of different approaches to field estimation within the scatterer on the backscattering cross section, as illustrated numerically by the cases of a circular disk, a needle, and a finite-length cylinder. A comparison is made of the results obtained by modeling a leaf by means of a circular disk within the Shifrin approximation, and a tree branch by means of a finite-length cylinder, with measurements from a single leaf and a single branch.
Document ID
19870065947
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Karam, M. A. (Texas Univ. Arlington, TX, United States)
Fung, A. K. (Texas, University Arlington, United States)
Antar, Y. M. M. (National Research Council of Canada Div. of Electrical Engineering, Ottawa, United States)