ELECTROMAGNETIC SCATTERING MODEL FOR A TREE TRUNK ABOVE A TILTED GROUND PLANE

被引:66
作者
LIN, YC
SARABANDI, K
机构
[1] Radiation Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1995年 / 33卷 / 04期
关键词
D O I
10.1109/36.406692
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
An efficient and realistic electromagnetic scattering model for a tree trunk above a ground plane is presented in this paper, The trunk is modeled as a finite-length stratified dielectric cylinder with a corrugated bark layer, The ground is considered to be a smooth homogeneous dielectric with an arbitrary slope, The bistatic scattering response of the cylinder is obtained by invoking two approximations, In the microwave region, the height of the tree trunks are usually much larger than the wavelength. Therefore the interior fields in a finite length cylinder representing a tree trunk can be approximated with those of an infinite cylinder with the same physical and electrical radial characteristics. Also an approximate image theory is used to account for the presence of the dielectric ground plane which simply introduces an image excitation wave and an image scattered field, An asymptotic solution based on the physical optics approximation is derived which provides a fast algorithm with excellent accuracy when the radii of the tree trunks are large compared to the wavelength, The effect of a bark layer is also taken into account by simply replacing the bark layer with an anisotropic layer, It is shown that the corrugated layer acts as an impedance transformer which may significantly decrease the backscattering radar cross section depending on the corrugation parameters, It is also shown that for a tilted ground plane a significant, cross-polarized backscattered signal is generated while the co-polarized backscattered signal is reduced.
引用
收藏
页码:1063 / 1070
页数:8
相关论文
共 14 条
[1]   MODELING AND OBSERVATION OF THE RADAR POLARIZATION SIGNATURE OF FORESTED AREAS [J].
DURDEN, SL ;
VANZYL, JJ ;
ZEBKER, HA .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1989, 27 (03) :290-301
[2]   ELECTROMAGNETIC SCATTERING FROM A LAYER OF FINITE LENGTH, RANDOMLY ORIENTED, DIELECTRIC, CIRCULAR-CYLINDERS OVER A ROUGH INTERFACE WITH APPLICATION TO VEGETATION [J].
KARAM, MA ;
FUNG, AK .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 1988, 9 (06) :1109-1134
[3]  
KOLAWOLE MO, 1992, J ELECTROMAG WAVES A, V16, P235
[4]   ELECTROMAGNETIC SCATTERING BY STRATIFIED INHOMOGENEOUS ANISOTROPIC MEDIA [J].
MORGAN, MA ;
FISHER, DL ;
MILNE, EA .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1987, 35 (02) :191-197
[5]  
RUCK GT, 1970, RADAR CROSS SECTION, V259, P479
[6]   SIMULATION OF A PERIODIC DIELECTRIC CORRUGATION WITH AN EQUIVALENT ANISOTROPIC LAYER [J].
SARABANDI, K .
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1990, 11 (11) :1303-1321
[7]   HIGH-FREQUENCY SCATTERING FROM CORRUGATED STRATIFIED CYLINDERS [J].
SARABANDI, K ;
ULABY, FT .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1991, 39 (04) :512-520
[8]   SCATTERING FROM DIELECTRIC STRUCTURES ABOVE IMPEDANCE SURFACES AND RESISTIVE SHEETS [J].
SARABANDI, K .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1992, 40 (01) :67-78
[9]  
SARABANDI K, 1989, THESIS U MICHIGAN AN, P224
[10]   ELECTROMAGNETIC SCATTERING FROM A DIELECTRIC CYLINDER OF FINITE LENGTH [J].
SEKER, SS ;
SCHNEIDER, A .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1988, 36 (02) :303-307