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Signatures of Forest Radar Images at VHF-band

Signatures of Forest Radar Images at VHF-band. Overview. Airborne SAR system IMARK Simultaneous radar and ground-based forest measurements GPR sensing Dependencies of backscattered signal on forest parameters Conclusions. Airborne SAR Complex IMARK.

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Signatures of Forest Radar Images at VHF-band

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  1. Signatures of Forest Radar Images atVHF-band

  2. Overview • Airborne SAR system IMARK • Simultaneous radar and ground-based forest measurements • GPR sensing • Dependencies of backscattered signal on forest parameters • Conclusions BioGeoSAR’07

  3. Airborne SAR Complex IMARK BioGeoSAR’07

  4. Disposition of the Antennas on the Plane BioGeoSAR’07

  5. Main Features of the IMARK SAR Complex BioGeoSAR’07

  6. Images Obtained by SAR System IMARK L-band P-band VHF-band Spas-Klepiki, Ryazanskaya Region BioGeoSAR’07

  7. The process of boring for the sampling of soil and the appearance of soil samples taken from different depths BioGeoSAR’07

  8. BioGeoSAR’07

  9. Use of GPR for carrying out investigations on permittivity fluctuations in subsurface soil layers BioGeoSAR’07

  10. The examples of GPR measurements in particular points BioGeoSAR’07

  11. Theoretical estimation of backscattering from forest stand Typical scattering mechanisms Scattering from array of cylinders with height distribution BioGeoSAR’07

  12. Scattering from layered medium with spatially inhomogeneous dielectric permittivity Three layers: layers 1, 2 are inhomogeneous, layer 3 is homogeneous. Correlation function of dielectric permittivity: Case 2: Layer 2 with large inhomogeneities (root system) Case 1: Layer 2 without large inhomogeneities BioGeoSAR’07

  13. Experimental dependencies of backscattered signal on stem diameter and distance between trees BioGeoSAR’07

  14. Experimental dependencies of backscattered signal on tree height and biomass BioGeoSAR’07

  15. Conclusions • Backscatter from forest at VHF band at HH polarization increases with the growth of biomass and tree diameter • Measurements conducted by ground penetrating radar confirm spatial variation of dielectric constant of the upper subsurface soil layer of forest • Large fluctuations of dielectric permittivity of the upper soil layer related with the presence of tree root system have significant importance in the formation of backscatter from forestland • Measurements conducted in different periods of time indicate the seasonal variation of backscatter from coniferous forest BioGeoSAR’07

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