New Methodology for Predicting Vertical Atmospheric Profile and Propagation Parameters in Subtropical Arabian Gulf Region

AbouAlmal, Abdulhadi; Abd‐Alhameed, Raed A.; Jones, S. M. R.; Al-Ahmad, Hussain

doi:10.1109/tap.2015.2452937

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…It plays a vital role in investigating clear air propagation and interference and is used to show the relative frequency of anomalous propagation [18]. Figure 2 depicts the monthly and annual distributions of β o values at 00, 06, 12 and 18 UTC in coastal and plateau region.…”

Section: Resultsmentioning

confidence: 99%

“…This parameter is commonly used to study clear air propagation and interference associated with relative incidence of anomalous propagation. It represents the percentage time in which the value of G is less than or equal to −100 N-units/km [18] and derived from cumulative distribution of refractivity gradient in the lowest 100 m of the atmosphere. In coastal region, maximum β o is observed at 00 UTC (midnight), which varies in the range of 100 ∼ 98% throughout the year.…”

Section: Resultsmentioning

confidence: 99%

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Statistical Investigation of Clear Air Propagation in the Coastal and Plateau Regions of Nigeria

Emmanuel¹,

Adeyemi²

2016

PIER Letters

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Abstract-The long-term meteorological data of Era-interim from 1979 to 2014 covering the observation at 00, 06, 12 and 18 UTC have been used to derive vertical refractivity gradient in the lowest 100. Diurnal, seasonal and annual variations of refractivity gradient and its component are analyzed for coastal and plateau areas of Nigeria. The relative frequency of the occurrence of gradient below −100 N-units/km used in clear air propagation study is derived from cumulative distribution of the gradient. Occurrence of anomalous propagation in each region is also estimated. The result will help in the effective wireless link planning and design.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Statistical Investigation of Clear Air Propagation in the Coastal and Plateau Regions of Nigeria

Emmanuel¹,

Adeyemi²

2016

PIER Letters

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“…The analysis of N s can be used at areas where upper air data are not available to evaluate vertical ΔN profile within the lowest 1 km of atmosphere [7,8]. Several empirical equations have been derived to estimate long-term median and mean values of ΔN for the lowest atmospheric layer above the ground from mean N s parameter [10,12].…”

Section: B Surface Refractivity Modelmentioning

confidence: 99%

“…Several studies related to the refractivity analysis are available [1][2][3]. Only a few studies are available for the Gulf region [4][5][6][7][8] although it is likely to experience abnormal conditions due to its special climate which is hot and humid, most of the year.…”

Section: Introductionmentioning

confidence: 99%

Surface refractivity profile and validation of measurements in Arabian Gulf region

AbouAlmal¹,

Alhassan

Obeidat

et al. 2015

2015 Loughborough Antennas &Amp; Propagation Conference (LAPC)

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In this paper, long-term meteorological data are measured using six fixed surface weather stations and one radiosonde in the subtropical Arabian Gulf region, in particular United Arab Emirates (UAE). The surface refractivity profiles, N s , and refractivity extrapolated to sea level, N o , obtained from surface meteorological data using both fixed and radiosonde stations are investigated and compared. The monthly and cumulative distributions of dry, wet and net components of N s and surface meteorological parameters obtained using both fixed and radiosonde stations are also presented and compared. The obtained results are compared with ITU maps for similar propagation parameters showing non-coherence in some cases.

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“…For microwave system design, some parameters such as effective earth radio factor, k and the point refractivity gradient, dN1 must be set carefully to optimize the system performance. Also, for such locations where atmospheric data were not available, k-factor value of 4/3 is taken as a standard value and estimated values of dN1 are also provided by ITU tables for point refractivity for such conditions [13]. Consequently, in this paper, three years atmospheric parameters data for Calabar, in the South-south Nigeria is used to determine the point refractivity gradient and then the effective earth radius factor, also called k-factor.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Clear-Air Atmospheric Effective Earth Radius (K-Factor) in Calabar

Ezenugu¹

2017

IJICS

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Microwave radio propagation in terrestrial radio links over the years has earned increased application and there has been renewed attention of studies concerning techniques for estimating the probability of multipath fading distributions. Particularly, the secondary radio parameters remain very important in carrying out these estimations especially the concept of effective earth radius. This study was carried out in Calabar, South-south Nigeria with three years atmospheric parameters data obtained from Nigerian Meteorological Agency (NIMET). International Telecommunication recommendation models were used in obtaining point refractivity gradient with which the effective earth radius factor was determined. The result showed a yearly average value of 1.626091667 for the k-factor and yearly average value of -125.50845 for the point refractivity gradient. There are also monthly and seasonal variations in the two parameters. The highest k-factor of 1.8263 occurred in January whereas the least k-factor of 1.3396 occurred in November.

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New Methodology for Predicting Vertical Atmospheric Profile and Propagation Parameters in Subtropical Arabian Gulf Region

Cited by 9 publications

References 12 publications

Statistical Investigation of Clear Air Propagation in the Coastal and Plateau Regions of Nigeria

Statistical Investigation of Clear Air Propagation in the Coastal and Plateau Regions of Nigeria

Surface refractivity profile and validation of measurements in Arabian Gulf region

Estimation of Clear-Air Atmospheric Effective Earth Radius (K-Factor) in Calabar

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