DocumentCode :
1541423
Title :
Rigorous modeling of ultrawideband VHF scattering from tree trunks over flat and. sloped terrain
Author :
He, Jiangqi ; Geng, Norbert ; Nguyen, Lam ; Carin, Lawrence
Author_Institution :
Dept. of Electr. & Comput. Eng., Duke Univ., Durham, NC, USA
Volume :
39
Issue :
10
fYear :
2001
fDate :
10/1/2001 12:00:00 AM
Firstpage :
2182
Lastpage :
2193
Abstract :
Three electromagnetic models are employed for the investigation of ultrawideband VHF scattering from tree trunks situated over flat and sloped terrain. Two of the models are numerical, each employing a frequency-domain integral-equation formulation solved via the method of moments (MoM). A body-of-revolution (BoR) Mote formulation is applied for a tree trunk on a flat terrain, implying that the BoR axis is perpendicular to the layers of an arbitrary layered-earth model. For the case of sloped terrain, the BoR model is inapplicable, and therefore the MoM solution is performed via general triangular-patch basis functions. Both MoM models are very accurate but are computationally expensive. Consequently, the authors also consider a third model, employing approximations based on the closed-form solution for scattering from an infinite dielectric cylinder in free space. The third model is highly efficient computationally and, despite the significant approximations, often yields accurate results relative to data computed via the reference MoM solutions. Data from the three models are considered, and several examples of application to remote sensing are addressed
Keywords :
backscatter; forestry; geophysical techniques; radar cross-sections; radar theory; remote sensing by radar; terrain mapping; vegetation mapping; VHF; backscatter; body-of-revolution; electromagnetic models; flat terrain; forest; frequency-domain integral-equation formulation; geophysical measurement technique; land surface; layered-earth model; method of moments; model; radar scattering; simulation; sloped terrain; terrain mapping; tree trunk; trees; ultrawideband scattering; vegetation mapping; Clutter; Dielectrics; Electromagnetic modeling; Electromagnetic scattering; Engine cylinders; Helium; Moment methods; Radar scattering; Surface topography; Ultra wideband technology;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/36.957281
Filename :
957281
Link To Document :
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