A Tree-Scattering Model for Improved Propagation Prediction in Urban Microcells

Abstract-A complex dielectric constant for poplar and monstera delicious's obtained by Ulaby at 10 GHz has been revised at 4 mm band. A measurement setup operating at 4 mm was established for making comparison between modeled and measured values. Results basically show that their electromagnetic transparency increases by drying as expected. While moisture content increases from 0% to 60%, transmitted power decreases from 95% down to 22%; reflection goes up to 50% and the absorption reaches from 1% to 20% for monstera leaf. A model developed for poplar responds much better than the model revised for monstera leaves.

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“…Each set has 10 samples collected from same plant. Each set was formulated and combined to obtain one equation as below in Equation (6) …”

Section: Resultsmentioning

confidence: 99%

“…The physical optic parameters were obtained for X band before, and dielectric constants of tropical leaves were measured and calculated in the literature at X band. Sarabandi [6] and Senior [7] showed that a resistive sheet constitutes an effective model of a leaf.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dielectric Constant of Thin Leaves by Moisture Content at 4mm Band

Helhel

Çolak²,

Özen³

2009

PIER Letters

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“…Unfortunately, the use of MST introduces enormous requirements in terms of computation time and the software implementation complexity [4][5][6]. Recently, the authors have developed in [7] a new model addressing scattering from tree canopies which significantly lowers the corresponding requirements by replacing MST coherent field calculations by utilizing the physical optics (PO) approach based on [8].…”

Section: Of 16mentioning

confidence: 99%

“…The reason is that, in this case, the corresponding tree canopy can be spatially sampled by voxels of sides exceeding half the wavelength [6], thus, significantly decreasing the computation time. We should note, however, that shadowing behind a tree canopy results only from the coherent field [4][5][6].…”

Section: Multiple Scattering Theory (Mst)mentioning

confidence: 99%

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A New Propagation Channel Synthesizer for UAVs in the Presence of Tree Canopies

2017

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Abstract:Following the increasing popularity of unmanned aerial vehicles (UAVs) for remote sensing applications, the reliable operation under a number of various radio wave propagation conditions is required. Assuming common outdoor scenarios, the presence of trees in the vicinity of a UAV or its ground terminal is highly probable. However, such a scenario is very difficult to address from a radio wave propagation point of view. Recently, an approach based on physical optics (PO) and the multiple scattering theory (MST) has been proposed by the authors, which enables fast and straightforward predictions of tree-scattered fields at microwave frequencies. In this paper, this approach is developed further into a generative model capable of providing both the narrowband and wideband synthetic time series of received/transmitted signals which are needed for both UAV communications and remote sensing applications in the presence of scattering from tree canopies. The proposed channel synthesizer is validated using both an artificially-generated scenario and actual experimental dataset.

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Modeling tree scattering in rural residential areas at 3.5 GHz

Chee

Catalán

Torrico³

et al. 2014

Radio Sci.

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[1] This paper addresses the modeling of tree scattering in rural residential areas at 3.5 GHz using a 3-D ray-optical approach. In this approach, a 3-D digital map of rural residential areas is constructed, where the terrain's signature, buildings, as well as vegetation are included. In particular, a tree is modeled as a cylindrical volume with radii varying from 2 to 5 m. Trees within a tree group are assumed to be uniformly distributed with a separation distance varying from 10 to 20 m. The scattered fields within a tree volume are determined by using the Foldy-Lax multiple scattering theory. Measurement data derived from cross-season measurement campaigns in a vegetated rural area in Germany are used to verify the simulation results.

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A Tree-Scattering Model for Improved Propagation Prediction in Urban Microcells

Cited by 68 publications

References 21 publications

Measurement of Dielectric Constant of Thin Leaves by Moisture Content at 4mm Band

Measurement of Dielectric Constant of Thin Leaves by Moisture Content at 4mm Band

A New Propagation Channel Synthesizer for UAVs in the Presence of Tree Canopies

Modeling tree scattering in rural residential areas at 3.5 GHz

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