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Wavelength dependence in radio-wave scattering and specular-point theoryRadio-wave scattering from natural surfaces contains a strong quasispecular component that at fixed wavelengths is consistent with specular-point theory, but often has a strong wavelength dependence that is not predicted by physical optics calculations under the usual limitations of specular-point models. Wavelength dependence can be introduced by a physical approximation that preserves the specular-point assumptions with respect to the radii of curvature of a fictitious, effective scattering surface obtained by smoothing the actual surface. A uniform low-pass filter model of the scattering process yields explicit results for the effective surface roughness versus wavelength. Interpretation of experimental results from planetary surfaces indicates that the asymptotic surface height spectral densities fall at least as fast as an inverse cube of spatial frequency. Asymptotic spectral densities for Mars and portions of the lunar surface evidently decrease more rapidly.
Document ID
19760042054
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tyler, G. L.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1976
Publication Information
Publication: Radio Science
Volume: 11
Subject Category
Communications And Radar
Accession Number
76A25020
Funding Number(s)
CONTRACT_GRANT: NGL-05-020-014
CONTRACT_GRANT: NSG-7029
Distribution Limits
Public
Copyright
Other

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