Modeling and Simulation of Near-Earth Propagation in Presence of a Truncated Vegetation Layer

Liao, DaHan; Sarabandi, Kamal

doi:10.1109/tap.2007.891812

Cited by 19 publications

(18 citation statements)

References 13 publications

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“…In this work, he used the ray-tracing approach to deal with the radio wave propagation. With the three-layered (air layer, forest layer, and ground layer) model, recently, full-wave Parabolic Equation (PE) algorithm [12] and semi-exact solution for the received field by surfacefield integration technique through an application of the equivalence or Huygen's principle [6] are implemented at VHF band to study the radio wave propagation in forest. However, unlike Tamir [11], noticeable asymmetry in the treatment of upward and downward links is experienced when one of the terminals is located outside of the forest [12].…”

Section: Methodsmentioning

confidence: 99%

“…However, unlike Tamir [11], noticeable asymmetry in the treatment of upward and downward links is experienced when one of the terminals is located outside of the forest [12]. In [6], Liao and Sarabandi report that ray-tracing in [11] provides accurate results at distant points from the vegetation truncation plane when the receiver height is large in terms of the wavelength. However, this method tends to underestimate the path loss for the case when the receiver is close to the ground.…”

Section: Methodsmentioning

confidence: 99%

“…Analytical [5,6] and experimental [7,8] work have been performed. However, there is still a significant amount of research work that needs to be performed, especially for the empirical work [7,8] which is site-specific, and limits the practical application of the existing research work.…”

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confidence: 99%

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Study of Propagation Loss Prediction in Forest Environment

Meng¹,

Lee²,

Ng³

2009

PIER B

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Abstract-A comprehensive review of radio wave attenuation in forest environments is presented in this paper. The classic analytical methods of propagation loss modeling and prediction are described first. This provides information on the physical processes that the radio waves undergo while propagating through a forest. The focus of this paper is on the review and summary of the experimental work done in this area and the development of empirical propagation loss prediction models. The propagation loss variation due to external factors such as antenna height-gain, depolarization, humidity effect etc. are examined and discussed individually. In view of current research work done in this area, some possible future work is proposed to improve the performance of radio links in forest environment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Study of Propagation Loss Prediction in Forest Environment

Meng¹,

Lee²,

Ng³

2009

PIER B

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“…The analytical methods proposed by Li et al [1], Liao et al [2], and Li et al [3], show high prediction accuracy. However, they are complicated and require great computational resource, then may not appeal to ordinary users.…”

Section: Introductionmentioning

confidence: 96%

“…For an implementation of military sensor networks in forested areas, the heights of the transmitter (Tx) and receiver (Rx) are low and therefore, not only the foliage effect needs to be considered, but also the effect of the ground reflection for near-ground propagation. Radio-wave propagation in a forest with near-ground antenna heights then becomes an attractive topic [1][2][3][4][5][6]. Analytical [1][2][3] and empirical [4][5][6] path loss modeling has been performed in such environments at the VHF and the UHF bands.…”

Section: Introductionmentioning

confidence: 99%

Path Loss Modeling for Near-Ground VHF Radio-Wave Propagation Through Forests With Tree-Canopy Reflection Effect

Meng¹,

Lee²,

Ng³

2010

PIER M

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Abstract-This paper presents a new methodology to model the nearground short-range propagation loss in forested areas at the VHF and the UHF band. The path loss modeling is performed by an integration of the foliage induced effect and the effect from the radiowave reflection/reflections. The analysis shows that the reflection from the dense tree canopy is important for short-range propagation at the VHF band and therefore, cannot be ignored. When taking into consideration the contribution from the possible tree-canopy reflection, the modeled path loss is reduced by more than 15 dB in the VHF band. A good agreement of the modeled path loss with the measured loss in tropical forested areas is achieved.

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A new empirical propagation model depending on volumetric density in citrus orchards for wireless sensor network applications at sub‐6 GHz frequency region

Doğan¹

2021

Int J RF Microw Comput Aided Eng

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The accuracy of the path loss models directly affects the performance of the wireless sensor networks (WSN) and the efficiency of coverage planning. In this article, as a novelty, new empirical path loss models with foliage depth are proposed at two different 5G frequencies (3.5 and 4.2 GHz) based on volumetric density rate (v) of the trees in citrus orchards for WSN. In order to generate/verify empirical models, measurements are performed at different locations with similar environment characteristics. First, the measurements are compared with commonly used empirical models such as LITU-R, FITU-R, Cost 235, and log-normal, and they are found to be compatible with these models. Second, empirical path loss model is generated based on these measurements. Accordingly, for 3.5 and 4.2 GHz, the coefficient of determination (R 2 ) values are 0.966 and 0.965, respectively. Thirdly, based on the proposed model, it is determined that increasing the v value by 30% increased path loss by 20 dB. Finally, the performance of the proposed models is compared with four different empiric models for calculated v as 0.571. Additionally, the 3.08 and 3.46 root mean square error values of the proposed models are considerably better than those of other models.

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Modeling and Simulation of Near-Earth Propagation in Presence of a Truncated Vegetation Layer

Cited by 19 publications

References 13 publications

Study of Propagation Loss Prediction in Forest Environment

Study of Propagation Loss Prediction in Forest Environment

Path Loss Modeling for Near-Ground VHF Radio-Wave Propagation Through Forests With Tree-Canopy Reflection Effect

A new empirical propagation model depending on volumetric density in citrus orchards for wireless sensor network applications at sub‐6 GHz frequency region

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