DocumentCode :
982396
Title :
Radar echo variations of a large rough sphere
Author :
Burrows, Michael L.
Author_Institution :
Massachusetts Institute of Technology, Lexington, Massachusetts, USA
Volume :
14
Issue :
4
fYear :
1966
fDate :
7/1/1966 12:00:00 AM
Firstpage :
455
Lastpage :
460
Abstract :
The effect of surface roughness on the radar backscattering cross section of a perfectly conducting nominally spherical target is examined by applying the Kirchhoff method. It is shown that, for the type of roughness and sphere size to which the Kirchhoff method is applicable, the standard deviation of the cross section increases with frequency according to the law 2\\sqrt {2} \\sigma _{0} k\\zeta until the first Fresnel zone reduces in size to the scale length of the roughness. At this point a knee in the curve occurs and its further course is determined by a more detailed statistical description of the surface. Here \\sigma _{0} is the nominal cross section, \\zeta is the standard deviation of the surface height h and k=2\\pi/\\lambda , where \\lambda is the wavelength. The average cross section is shown to be given by \\sigma _{0}[1+0 {(kh)^{3}}] . Some experimental results are reported which support the theoretical conclusions.
Keywords :
Electromagnetic scattering by absorbing media; Radar scattering cross sections; Spheres; Frequency; Fresnel reflection; Knee; Optical scattering; Optical sensors; Optical surface waves; Radar cross section; Rough surfaces; Surface roughness; Surface waves;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/TAP.1966.1138708
Filename :
1138708
Link To Document :
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