Millimeter foliage penetration measurements

Currie, N. C.; Dyer, F. B.; Martin, Edith W.

doi:10.1109/aps.1976.1147578

Cited by 10 publications

(5 citation statements)

References 1 publication

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“…It is also obvious that as the range to the target/ground is increased, the effect of point target shadowing diminishes. In view of (9), (7) can be modified and the ground reflectivity in the presence of a trihedral can be obtained from (10) where and can be directly obtained from the time-domain radar backscatter measurements.…”

Section: A Ground Reflectivity Measurementsmentioning

confidence: 99%

Millimeter-Wave Measurements of Foliage Attenuation and Ground Reflectivity of Tree Stands at Nadir Incidence

Nashashibi

Sarabandi

Oveisgharan

et al. 2004

IEEE Trans. Antennas Propagat.

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Abstract-In this paper, the phenomenology of wave propagation through foliage and forest ground reflectivity is investigated for assessing the feasibility of foliage-covered target detection at millimeter-wave frequencies. An experimental procedure for simultaneous measurements of foliage attenuation and ground reflectivity is outlined. This measurement procedure is implemented for two different tree stands, one mostly coniferous and the other deciduous, using a nadir-looking, high-resolution, 35-GHz radar positioned above the tree canopy. Statistics of the two-way attenuation and ground reflectivity for these two well-characterized stands are derived.

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Section: A Ground Reflectivity Measurementsmentioning

confidence: 99%

Millimeter-Wave Measurements of Foliage Attenuation and Ground Reflectivity of Tree Stands at Nadir Incidence

Nashashibi

Sarabandi

Oveisgharan

et al. 2004

IEEE Trans. Antennas Propagat.

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“…The realistic dry-matter fraction, density, thickness, and diameter of the leaves are chosen, so that the attenuation coefficient is in the range reported in the literature at the L-band [37]- [40]. By choosing the parameters in Table I, the attenuation of the canopy is computed to be 0.5 dB/m [31], [32], [41], reasonably within the measured and modeled range at the L-band [32], [38], [39], [41].…”

Section: Summary Of Scattering Model Formulationmentioning

confidence: 99%

Sensitivity of Pol-InSAR Measurements to Vegetation Parameters

Oveisgharan

Saatchi

Hensley

2015

IEEE Trans. Geosci. Remote Sensing

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Estimation of forest height from combined polarimetric and interferometric synthetic aperture radar (Pol-InSAR) measurements has been the focus of radar remote sensing studies in the past decade. The simplicity of the random-volume-overground (RVoG) model makes it one of the most widely used candidates for estimating canopy height. However, the polarization-independent extinction coefficient assumption in the RVoG model fails in some certain types of the canopies, as suggested by the oriented-volume-over-ground (OVoG) model. The sensitivity of coherence magnitude and phase to different parameters of the canopy is expressed in a closed-form formulation in this paper for the first time. In order to simplify our formulation, the forest is represented by a layer of discrete randomly distributed dielectric scatterers over ground, with azimuthal symmetry. The sensitivity analysis of this work quantifies the contribution of differential extinction due to polarization change in interferometric coherence. Therefore, we can quantitatively evaluate whether the RVoG model is accurate enough to be used for a specific kind of canopy or the OVoG model is needed for better estimation. A simple layer of leaves over ground is used to simulate the sensitivity of Pol-InSAR measurements to different parameters.

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“…A number of research efforts aimed at characterizing propagation and bistatic scattering in tree canopies have 2 been reported in the past [4]- [7]. They demonstrated degradation in coherence and amplitude as MMW signals propagate in forest stands.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the propagation parameters of tree canopies at MMW frequencies

Nashashibi

Ulaby

Frantzis

et al. 2002

IEEE Trans. Geosci. Remote Sensing

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The presence of trees in a given scene can hamper detection of nearby targets by millimeter-wave radars especially at near grazing incidence. Proper characterization of scattering and attenuation in tree canopies is important for optimal detection algorithms. In this paper, a new technique for determining the extinction and volume backscattering coefficients in tree canopies using the measured radar backscatter response is proposed and verified experimentally. The technique, which can be applied to already available wideband radar backscatter data, is used to compute the extinction and volume backscattering coefficients of different tree canopies under various physical conditions. The dynamic range of these coefficients are presented and results at 35 GHz are compared with results at 95 GHz.

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Millimeter foliage penetration measurements

Cited by 10 publications

References 1 publication

Millimeter-Wave Measurements of Foliage Attenuation and Ground Reflectivity of Tree Stands at Nadir Incidence

Millimeter-Wave Measurements of Foliage Attenuation and Ground Reflectivity of Tree Stands at Nadir Incidence

Sensitivity of Pol-InSAR Measurements to Vegetation Parameters

Measurements of the propagation parameters of tree canopies at MMW frequencies

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