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In a discrete model, the aggregated electromagnetic parameters of vegetation
chosen for evaluation of vegetation behavior were the attenuation, cross-section and
scattering cross-section of the vegetation elements. The vegetation elements were
modeled by disks, strips, and cylinders. A spectral dependence of the attenuation
and scattering cross-sections are determined. Total attenuation in the vegetative
media was studied by using the radiation transfer theory.
An experimental part of the ISTC-2059 Project included laboratory and
field
measurements. A special laboratory complex was built up to conduct investigation
of the attenuation by plant samples and plant elements in a wide range of fre-
quencies. This complex includes two waveguide transmission systems operating in
the frequency range of 0.2
8.0 GHz (Figs.
8.21
and
8.22
). The radio attenuation
-
Fig. 8.21 Block diagram of super-wide band waveguide measuring system (Chukhlantsev 2006)
Fig. 8.22 General view of measuring system for the study of attenuation of electromagnetic
waves by vegetation canopies in the 100
1,000 MHz frequency band (Chukhlantsev et al. 2003)
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