A Foliage Penetration Summary

Golden, August

doi:10.21236/ada055391

Cited by 5 publications

(2 citation statements)

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“…where E0 is the amplitude of the incident electric field, E is the amplitude of the electric field after propagating through the media, •* is the effective complex dielectric constant of the media, and z is the distance the wave travels through the media. The dielectric slab model has been shown to provide a good estimate of the scattering and absorption of em radiation propagating through foliage media when used in a "background configuration" up to L band [Golden, 1978;Sachs and Wyatt, 1966].…”

Section: Introductionmentioning

confidence: 99%

Application of volumetric multiple scattering approximations to foliage media

Tamasanis¹

1992

Radio Science

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Vegetation media may be viewed as two or more different types of dielectric scatterers arranged in a random geometric configuration in a surrounding “host” medium. This allows the vegetation to be treated as a continuous medium where the propagation of the waves through that medium is governed by an effective dielectric constant, (ε*). In this paper, several multiple scattering approximation techniques were used to quantitatively estimate the values of the effective dielectric constants for vegetation media based on the foliage density and dielectric properties of the scattering elements composing the vegetation. Because this formalism is not computationally intensive, it is useful for modeling the propagation losses experienced by an electromagnetic wave propagating through vegetation media in electromagnetic scattering or radar simulations. The theoretical approximations of ε* are compared with data at three levels. First, the calculated values of ε* were compared with values reported in the literature. Second, the effective dielectric constants for a foliage environment were used to calculate attenuation coefficients of coherent waves propagating through dense vegetation. The calculated attenuation constants were compared with experimental measurements reported by various authors at frequencies between 50 MHz and 3.2 GHz, resulting in good agreement. Finally, the values of ε* were incorporated into a bistatic scattering model which was used to calculate an effective normalized scattering cross section σ0 for a grass‐ and forest‐covered terrain. This was compared with L band data resulting in excellent agreement between theory and experimental data.

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Section: Introductionmentioning

confidence: 99%

Application of volumetric multiple scattering approximations to foliage media

Tamasanis¹

1992

Radio Science

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“…They also consider the use of artificial dielectric theory to estimate the effective complex dielectric constant of a foliated path; however, their results are limited to relatively low frequencies. Golden [1978] extends the concept of an effective complex dielectric constant to higher frequencies but provides no means for estimating this quantity. The recent work of Lan•t [1981] on scattering from foliage parallels, somewhat, the approach taken in this paper, but the underlying model rationale is different.…”

Section: Introductionmentioning

confidence: 99%

A theory and model for wave propagation through foliage

Brown¹,

Curry²

1982

Radio Science

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A theory is presented and a model is developed to predict the effects of foliage on a line‐of‐sight propagating field. In view of the sparse concentration of foliage, the Foldy‐Twersky theory for wave propagation through discrete random media is used to obtain the complex propagation constant for the coherent field. On the basis of the measurements of Stutzman et al. (1979), the dominant foliage components are taken to be Rayleigh‐like in their scattering and absorbing characteristics. The effective fractional volume of foliage comprising the Rayleigh components is constructed as a function of frequency using forest stand table data. Trunks and branches are modeled as Rayleigh cylinders; leaves are ignored because of their small total volume. The model fails above the frequency for which the effective fractional volume goes to zero. The model provides reasonably good agreement with propagation measurements and is capable of explaining some of the observed polarization effects.

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Inverse scattering analysis of diffraction limited SAR

Hellsten

1990

IEEE Trans. Antennas Propagat.

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A Foliage Penetration Summary

Cited by 5 publications

References 0 publications

Application of volumetric multiple scattering approximations to foliage media

Application of volumetric multiple scattering approximations to foliage media

A theory and model for wave propagation through foliage

Inverse scattering analysis of diffraction limited SAR

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