Ultra-short-wave propagation in the jungle

Burrows, Chas. R.

doi:10.1109/tap.1966.1138698

Cited by 17 publications

(22 citation statements)

References 13 publications

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“…The relationship between antenna height and the received power in (8) and (9) is verified in [37] through measurements performed within a tropical jungle with foliage depth of up to 6.4 km in Thailand. In the experiment, horizontally polarized antennas are used at a frequency of 100 MHz, with the transmit antenna height, h T kept at a constant of 24.2 m, and the receive antenna height, h R varying from 5 to 30 m. Later, Tewari et al [38] considered the contribution from the lateral wave at far zone and suggested the following model based on the measurements within the frequency band of 50 to 800 MHz with tropical forested depths of up to 4 km, P L f orest (dB) = −27.57 + 20 log 10 (f ) − 20 log 10…”

Section: Empirical Methodsmentioning

confidence: 78%

“…In 1966, Burrows [37] started a prediction of the radio gain (inverse to the path loss) in a jungle at VHF band with the consideration of ground reflection as,…”

Section: Empirical Methodsmentioning

confidence: 99%

“…With these experience [37,38], the researchers in [39] and [40] conducted a series of VHF and UHF experimental path loss measurements and modeling in forests with the general expression in (11),…”

Section: Empirical Methodsmentioning

confidence: 99%

“…After the introduction of antenna height-gain on the propagation loss analytically [9] and experimentally [37,45], Tewari et al [46] performed an in-depth empirical modeling of antenna height-gain on the path loss in the forest. Based on the results of measurement conducted in various tropical rainforest, with foliage depths of up to 4 km in India, the empirical model is derived.…”

Section: Antenna Height-gain Effectmentioning

confidence: 99%

“…For the plain terrain effect, analytical [18,19] and experimental [7,37,44] studies show that, the ground reflection from a plain forested terrain plays a significant role on the radio wave propagation at VHF and UHF bands. The experimental results in [7,37,44] show that the ground reflection can result in a similar antenna height-gain effect as in [37] and [46] (proportional to h 2 T h 2 R ). For the hilled forested terrain effect, Meeks [49] started the investigation of the diffraction due to a forested hill at VHF.…”

Section: Terrain Effectmentioning

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: Empirical Methodsmentioning

confidence: 78%

“…In 1966, Burrows [37] started a prediction of the radio gain (inverse to the path loss) in a jungle at VHF band with the consideration of ground reflection as,…”

Section: Empirical Methodsmentioning

confidence: 99%

Section: Empirical Methodsmentioning

confidence: 99%

Section: Antenna Height-gain Effectmentioning

confidence: 99%

Section: Terrain Effectmentioning

confidence: 99%

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Study of Propagation Loss Prediction in Forest Environment

Meng¹,

Lee²,

Ng³

2009

PIER B

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A ConductingߚSlab Model for Electromagnetic Propagation Within A Jungle Medium

Sachs¹,

Wyatt²

1968

Radio Science

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A theoretical determination of the path loss in radio propagation through jungle is obtained by considering the jungle as a homogeneous conducting dielectric slab on a flat earth. An exact integral is obtained for the vertical component of the electric field within the jungle due to a vertical electric dipole within the jungle. An analytic evaluation of the integral leads to an approximate expression for the field and an estimate of the error. When this accuracy is insufficient, a numerical evaluation of the integral is performed. The combination of analytic and numerical techniques leads to the evaluation of the electric field and thereby path loss to any accuracy desired. Experimental measurements of path loss in a Thailand jungle are compared with the calculations. The results agree within a standard deviation of 6 dB when the jungle conductivity is taken as 0.15 mmho/m.

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Ultra‐high frequency near‐ground short‐range propagation measurements in forest and plantation environments for wireless sensor networks

Rao

Balachander

Tiwari

et al. 2013

IET wirel. sens. syst.

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The growing interest in applications of wireless sensor networks (WSNs) in vegetation environment has made it important to understand and predict the impact of vegetation on coverage and signal quality. As most of the proposed vegetation attenuation models are mainly based on measurements in temperate climate their prediction accuracy needs to be tested in tropical climate. With the presence of high humidity and high temperature in the tropical climate the attenuation because of vegetation is bound to increase. Very few researches have been reported about the attenuation because of vegetation related to WSN applications in scrub forest and plantation environments from the regions having tropical climate in Indian subcontinent. This study focuses on short-range, near to ground received signal strength measurements at 915 and 2400 MHz to evaluate vegetation attenuation models for planning and deployment of wireless sensor communications/ networks in tropical climate for precision agriculture and plantation management applications. The measurements have been done in scrub forest, mango and guava plantation environment. It is found that International Telecommunication Union (ITU) Recommendation (ITU-R) and Weissberger models under predict vegetation because of attenuation, whereas the Cost 235 model has high prediction accuracy in the scrub forest and plantation environments in tropical climate.

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Ultra-short-wave propagation in the jungle

Cited by 17 publications

References 13 publications

Study of Propagation Loss Prediction in Forest Environment

Study of Propagation Loss Prediction in Forest Environment

A ConductingߚSlab Model for Electromagnetic Propagation Within A Jungle Medium

Ultra‐high frequency near‐ground short‐range propagation measurements in forest and plantation environments for wireless sensor networks

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