I hope the radar backscatter is influenced by moisture content, orientation of the object and di-electric properties of the objects under study. I exactly would like to calculate the two way attenuation of the radar backscatter.
I am trying to understand the interaction of SAR waves with the natural phenomenon, i would like to know quantitatively how much of the energy is attenuated?
The answer is no simple at all. The media is not homogeneous. Of course if one approximate it as an homogeneous one - an equivalent permittivity must be determined and then the task is similar to the one can be found in a good electromagnetic textbook
I think this paper can helps you to understand the phenomenon of two attenuation from soil due to vegetation cover .
You can probably still download the fortran code for the Michigan Microwave Scattering which used a Radiative Transfer approximation to randomly distributed cylinders in the media representing leafs, needles and branches and vertical trunks. If your library carries it, check out the bible: Ulaby, F. T., Moore, R. K. and Fung, A. K., Microwave Remote Sensing: Active and Passive, Vol. II, The Artech House Remote Sensing Library, Portland House, London, 1986.
I used it to study the detectability of understory in c and L bands: The Effect of Forest Understory on Synthetic Aperture Radar Backscatter Jos'em. B. Dias, Tiago A. M. Silva
A good reference is a book by Mark Davis "Foliage Penetration Radar: Detection and Characterization of Objects Under Trees"... search at Amazon.com...
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