Some Tropical Rainfall Rate Characteristics at Ile-Ife for Microwave and Millimeter Wave Applications

Ajayi, G. O.; Ofoche, E.B.C.

doi:10.1175/1520-0450(1984)023<0562:strrca>2.0.co;2

Cited by 67 publications

(49 citation statements)

References 3 publications

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“…Study has revealed that daily rainfall accumulations are universally recorded and hourly data are fairly available by national weather bureaus/environmental agencies [27]. There is still dearth of rainfall rate of 1-minute integration time necessary for the study of rain induced impairment to telecommunication especially in the tropical region (Nigeria) [1]. This is because global national weather services are established to satisfy more traditional requirements such as those for agriculture, hydrology and forest management.…”

Section: Introductionmentioning

confidence: 99%

Rain Rate and Rain Attenuation Prediction for Satellite Communication in Ku and Ka Bands Over Nigeria.

Ojo¹,

Ajewole²,

Sarkar³

2008

PIER B

131

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Abstract-Rain rate and rain attenuation predictions are one of the vital steps to be considered when analyzing a microwave satellite communication links at the Ku and Ka bands. In this paper, tools for the prediction of rain rate and rain attenuation are presented in the form of contour maps for Nigeria using a massive rainfall data bank of 30 years which are taken from measurements made from the coast to the arid region of Nigeria. Rain-rate maps for the country of Nigeria were developed using the models purposely designed for tropical zones while ITU-R models were used for the rain-attenuation maps. The information from these maps will be a good preliminary design tools for both terrestrial and earth-satellite microwave links and also provide a broad idea of rain attenuation for microwave engineers.

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Section: Introductionmentioning

confidence: 99%

Rain Rate and Rain Attenuation Prediction for Satellite Communication in Ku and Ka Bands Over Nigeria.

Ojo¹,

Ajewole²,

Sarkar³

2008

PIER B

131

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“…These values are dependent on the integration time of the measurement device in use. Many researchers [7,8] have suggested the use of integration times of 1-minute as the most suitable. Rainfall studies in Africa [4-7, 9, 10] and South African region [11][12][13] have suggested the need for adequate rainfall data at 1-minute integration time, which are scarce.…”

Section: Introductionmentioning

confidence: 99%

Rain Cell Size Mapping for Microwave Link Design Systems in South Africa

Akuon¹,

Afullo²

2011

PIER B

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Abstract-Rain cell size is an input requirement for rain-induced attenuation studies. It is useful in estimating the extent of a given radio link path that will traverse the rain medium in a given rain event. The "Synthetic Storm" approach, which requires 1-minute integration time data, is used to derive the proposed rain cell sizes for various climatic zones within South Africa. The conversion of the readily available 1-hour integration time rain rate data to the desired 1-minute rain rate is carried out first for some locations and then validated by the existing measurement data and proposed global conversion factors. By the use of rain-induced attenuation prediction equation for terrestrial links that requires rain cell size as input, contour plots of specific attenuation for two high bandwidth frequencies used in terrestrial link implementations is presented. Site diversity separation distance map is proposed as well from the link budget analysis for each location to achieve an all time link availability of 99.99% of time.

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“…Among other similar disturbing factors is the hail [2], which is one of the most terrible natural disaster with severe impacts on mankind. For the propagation of radiowave signals however, attenuation due to rain remains a major loss factor required for planning communication systems and it affects applications operating within the microwave (3-30 GHz) and millimeter wave (30-300 GHz) bands, particularly for frequencies beyond 10 GHz [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Since the accurate prediction of rainfall attenuation depends on the knowledge of the long-term local precipitation data over a particular area, the rain gauge installation at Osun State University, Osogbo is an addition to the South-western precipitation measurement network [4,[24][25][26][27] for propagation studies in Nigeria. Due to the short integration time requirement for radio propagation purposes, the daily precipitation measurement at the Osogbo Aerodrome has not been directly useful in this regard.…”

Section: Introductionmentioning

confidence: 99%

Recent Update on One-Minute Rainfall Rate Measurements for Microwave Applications in Nigeria

Obiyemi

Adetan²,

Tunji³

2015

WCMC

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Abstract:Rain rate statistics is required for planning both satellite and terrestrial links, especially in the microwave and millimeter wave bands. Presented in this work is the one-minute rain rate statistics observed over seventeen months using an electronic weather station -Davis Vantage Vue. The installation is at the main campus of Osun State University, Osogbo (7° 76' N, 4° 60' E), Nigeria. The cumulative rain rate distribution from the measured rain rate is presented alongside predictions by other prominent models. The R 0.01 estimate as high as ~ 120 mm/h was obtained from the surface data and subsequently employed in estimating the fade margin over a hypothetical DTH link for the reception of digital television content at 12.245 GHz from EUTELSAT W4/W7. Estimates presented over time percentages ranging between 0.001% and 1% are dissimilar. However, their suitability for predicting fade margins over this location could be ascertained via a performance analysis, based on experimental attenuation estimates over the link. The first point rain rate estimate from surface data over Osogbo is reported here and will be very useful for modeling rain attenuation and for planning both terrestrial and earth-space microwave links.

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Some Tropical Rainfall Rate Characteristics at Ile-Ife for Microwave and Millimeter Wave Applications

Cited by 67 publications

References 3 publications

Rain Rate and Rain Attenuation Prediction for Satellite Communication in Ku and Ka Bands Over Nigeria.

Rain Rate and Rain Attenuation Prediction for Satellite Communication in Ku and Ka Bands Over Nigeria.

Rain Cell Size Mapping for Microwave Link Design Systems in South Africa

Recent Update on One-Minute Rainfall Rate Measurements for Microwave Applications in Nigeria

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