Electrophysical and scattering properties of elements of coniferous stands

Novik, S.N.; Zav’yalov, A. S.; Tel'pukhovskii, E. D.

doi:10.1007/s11182-006-0170-1

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…This information, combined with field measurements of the height of the forest, the coordinates of the location of the receiving antenna in the forest, make it possible to unambiguously determine the trajectory of the path and the linear attenuation coefficient of the NS signal in the forest. The signal attenuation is due to the aggregate scattered on large-scale irregularities (tree trunks, large volumes of snow on the branches, irregularities in their distribution in space) and is partially absorbed in small-scale elements of trees (thin branches, needles, leaves) [9][10][11]. An additional effect on the recorded signal is made by the effect of depolarization of the GNSS signal and the appearance of a cross-polarized component due to the anisotropy of the permittivity of the forest.…”

Section: Discussionmentioning

confidence: 99%

Use of navigation satellite signals to determine stocks of stem wood

et al. 2020

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The method for determining the stocks of stem wood using the measurement data of the linear attenuation coefficients of signals navigation satellites L1 range and general taxometric characteristics of the forest is presented. A variant of determining the stocks of stem wood by differences in contributions to the attenuation by layers of crowns and trunks is considered, taking into account the coordinate referencing of the trajectory of the probe signal in the tree stand.

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Section: Discussionmentioning

confidence: 99%

Use of navigation satellite signals to determine stocks of stem wood

et al. 2020

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“…The dielectric permittivity of leaves and needles of different types of forests depending on humidity varies for the real part of ɛ' from one to 40 and for the imaginary part of ɛ'' from 0.2 to five [6][7]. The electro physical model of tree stand as an aggregate of individual trees with a relatively low density of tree elements distribution in the volume of a stand suggests taking into account the dielectric properties of individual tree elements in a given frequency range.…”

Section: Special Features Of the Dielectric Forest Model For Gnss Sigmentioning

confidence: 99%

Forest dielectric characteristics for navigation satellites signals in L 1 range

2019

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A structural dielectric model of the forest is presented taking into account the wood Biomass distribution. The multi-scale structural formations of the individual trees and the stand as a whole as a hierarchical system of non-interacting components of the mixed dielectric are discussed. Layers of crowns and trunks are distinguished as anisotropic dielectric media with gradient boundaries. The possibility of using the orientation parameter of the order of branches in the crown layer to estimate the gradients of the effective permittivity of the inhomogeneous distribution and its spatial anisotropy is analyzed. A comparative analysis of the features of the effective dielectric permittivity of pine and birch forests is carried out. The possibilities of using a layered anisotropic dielectric forest model to describe the transformation of GPS and GLONASS signals in order to restore the biometric characteristics of the forest are considered.

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