VHF SAR models and measurements of targets under coniferous forest canopies

Measurements of attenuation in the VHF-band through coniferous forests in southwest Sweden are presented, indicating that the forest canopy causes a loss of about 1.5 dB, irrespective of stem volume (from 270 to 460 m/sup 3//ha). The variation of attenuation with frequency and polarisation has also...

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Bibliographic Details
Main Authors: Smith, G., Ulander, L.M.H., Xianyun Luo, Martin, T.
Format: Conference Proceeding
Language:English
Subjects:
Attenuation measurement
Backscatter
Biomass
Broadband antennas
Frequency
Image analysis
Polarization
Radar scattering
Space technology
Synthetic aperture radar
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Summary:Measurements of attenuation in the VHF-band through coniferous forests in southwest Sweden are presented, indicating that the forest canopy causes a loss of about 1.5 dB, irrespective of stem volume (from 270 to 460 m/sup 3//ha). The variation of attenuation with frequency and polarisation has also been investigated, and found to be in line with predictions using Foldy's approximation for the mean field, i.e. the attenuation due to scattering loss from trunks is higher for vertical than horizontal polarisation, and increases with frequency.
DOI:10.1109/IGARSS.2000.857998