Rain attenuation statistics from rain cell diameters and heights

Bryant, GH Geoff; Adimula, IA; Riva, C.; Brussaard, G.

doi:10.1002/sat.673

Cited by 78 publications

(62 citation statements)

References 17 publications

(18 reference statements)

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“…As the rain rate decreases so does the rain height due to the stratiform downward thrust. Although not discussed here, this invariability leads to break point as earlier observed by [26]. Figure 3 presents the equivalent satellite to common volume distance and the corresponding station separation.…”

Section: Resultsmentioning

confidence: 53%

Analysis of Bistatic Scattering Due to Hydrometeors on SHF and Ehf Links in a Subtropical Location: A Comparative Study Based on the Rain Cell Models

Owolawi¹,

Walingo²

2015

PIER M

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Abstract-The inevitable increase in radio interference within microwave systems continue to be of major concern as more of radio communication services compete with bandwidth assigned to the fixed service, fixed satellite service and broadcasting satellite service. Interference hampers coverage and capacity of these services often lead to the reduction in the signal to noise ratio at the receiving terminals. The existing global hydrometeor scatter model proposed by the International Telecommunication Union when applied to the tropical and subtropical location often leads to considerable inaccuracies due to the wide range of intense climatic and geographical nature of this region. In this study, the bistatic intersystem interference due to hydrometeors between satellite systems and terrestrial downlink receiver terminal systems in a subtropical station computation is based on the Awaka and Capsoni cell models. For the attenuation of both wanted and unwanted paths to the receiver, the existing model based on the specific attenuation has been modified to include the equivalent path length through rain in the estimation of the attenuation. Results obtained show that the Capsoni model exhibits the normal trend under a moist atmosphere with a gaseous attenuation more pronounced at frequencies greater than or equal to 30 GHz. Also at high rain rates greater than 70 mm/h and considering the rain with melting layer, up to about 70 dB difference was observed between transmission losses estimated using Awaka and Capsoni models at link probabilities ranging between 1-10 −3 % unavailability of the time.

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Section: Resultsmentioning

confidence: 53%

Analysis of Bistatic Scattering Due to Hydrometeors on SHF and Ehf Links in a Subtropical Location: A Comparative Study Based on the Rain Cell Models

Owolawi¹,

Walingo²

2015

PIER M

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“…1, shows that as the rain rate increases, the trend of the slope curve gradually decreases from a large negative value, and then the trend is reversed. The point at which the trend changes is referred to as the 'breakpoint' in the exceedance curves [4,16]. In Figs.…”

Section: Resultsmentioning

confidence: 99%

“…The most effective way of obtaining the cumulative rainfall distribution is through direct measurement. However due to the shortage of the required rainfall data at certain locations, rainfall models need to be introduced to predict the rainfall rate and attenuation distribution at location of interest [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Rain Attenuation Predictions at Ku-Band in South East Asia Countries

Singh¹,

Allnutt²

2007

PIER

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Abstract-The rain attenuation in the 12-GHz band and one-minuterain rate were measured at four satellite beacons located in South East Asia countries over a three-year period (2002)(2003)(2004). The cumulative distribution of rain rate obtained as well as cumulative distribution of rain attenuation obtained are presented and compared with the rain prediction models. Most of the rain prediction models showed noticeable deviation to the measured values above the existence of the breakpoint (the point at which the slope changes). The results can be employed to guide the design and application of slant-path communication systems, especially in South East Asia countries.

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“…The path correction factor is defined as the ratio of effective path length to the physical path length of a microwave link, and its value is usually less than unity, except in rear cases [14].The concept of effective path length is thus a way of 'averaging out' the spatial inhomegeneity of rain rate and thus specific attenuation [15]. Note that the degree of spatial inhomogeneity in rain rate generally varies with rainfall intensity.…”

Section: Theoretical Background Of Rain Attenuation Prediction Momentioning

confidence: 99%

Statistical Evaluation of Measured Rain Attenuation in Tropical Climate and Comparison with Prediction Models

Yusuf

Falade

Olufeagba

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-Substantial modifications have been made to the expressions for calculating distance factor and extrapolation techniques in the latest ITU-R P.530-14. However, its performance has not been rigorously evaluated in the tropical and equatorial climates. In this article, the new ITU-R method and three prediction models are validated using measurement data from tropical Malaysian climate. The data were collected on six geographically spread terrestrial microwave DIGI MINI-LINKs operating at 15 GHz. When tested against measurements, the Da Silva Mello model yields a significant improvement for the prediction of rain attenuation distributions. The prediction errors observed in the ITU-R model suggest the need for more data campaign in the afore-mentioned climates. I. INTRODUCTIONTraditionally frequencies above 10 GHz are commonly employed in the current microwave point-topoint networks, due to large bandwidth and freedom from traffic congestion. However, in these frequency bands, the performance of the fixed service (FS) is predominantly controlled by rain in 2012; however, its performance has not been largely evaluated using data collected from tropical climates. Therefore, the main aim of this article is to evaluate the performance of the newly released ITU-R model and the three afore-mentioned models, using measurement data from six locations in a tropical climate. The data used are the rain rate and rain attenuation data banks available from six geographically spread terrestrial microwave DIGI MINI-LINKs operating at 15 GHz as described in[13]. It should be mentioned here that the ITU-R P.530-14 was not yet in force when our previous works were reported. II. THEORETICAL BACKGROUND OF RAIN ATTENUATION PREDICTION MODELSRain attenuation can be conveniently defined as the product of specific attenuation (dB/km) corresponding to the point rain rate (typically measured at one end of the link) and the effective propagation path length (km) [1]. The path correction factor is defined as the ratio of effective path length to the physical path length of a microwave link, and its value is usually less than unity, except in rear cases [14].The concept of effective path length is thus a way of 'averaging out' the spatial inhomegeneity of rain rate and thus specific attenuation [15]. Note that the degree of spatial inhomogeneity in rain rate generally varies with rainfall intensity. Therefore the variation of path length reduction factor can be expressed as a function of rain rate or the corresponding time exceedance [16].Attenuation p A exceeded at p % of time can either be obtained from direct measurements, or predicted from the knowledge of long-term rainfall rate. Generally, the required inputs in most attenuation prediction models for terrestrial point-to-point microwave links are the rainfall rate exceeded at p % of time, the effective propagation path length and the link's operating frequency [7], [16]. Thus p

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Rain attenuation statistics from rain cell diameters and heights

Cited by 78 publications

References 17 publications

Analysis of Bistatic Scattering Due to Hydrometeors on SHF and Ehf Links in a Subtropical Location: A Comparative Study Based on the Rain Cell Models

Analysis of Bistatic Scattering Due to Hydrometeors on SHF and Ehf Links in a Subtropical Location: A Comparative Study Based on the Rain Cell Models

Rain Attenuation Predictions at Ku-Band in South East Asia Countries

Statistical Evaluation of Measured Rain Attenuation in Tropical Climate and Comparison with Prediction Models

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