Physics – Optics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rasc...11...83t&link_type=abstract
Radio Science, vol. 11, Feb. 1976, p. 83-91.
Physics
Optics
6
Frequency Response, Radio Scattering, Specular Reflection, Surface Roughness Effects, Diffuse Radiation, Low Pass Filters, Planetary Surfaces, Scattering Cross Sections, Statistical Analysis
Scientific paper
Radio-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.
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