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This paper examines recently measured polarimetric radar backscatter data of different types of bare and vegetation-covered surfaces at 222 GHz. Bare surfaces, such as asphalt, dirt, and concrete, are electrically rough with aggregate sizes comparable to the wavelength. This results in substantial volume and surface scattering. The data show strong angular dependence of the backscatter response from...
Radar imaging of deserts suffers from insufficient radar backscatter at low microwave frequencies due to the low permittivity of dry sand and relatively smooth sand surface roughness. Operating at millimeter-wave (MMW) frequencies, however, rectifies this deficiency as significant radar backscatter is generated by surface and volume scattering. This is due to the fact that sand surface roughness is...
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