One-year cloud attenuation results at 50 GHz

Al-Ansari, K.; García, Pedro López; Riera, José Manuel; Benarroch, Ana

doi:10.1049/el:20030059

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…Specifically, only a few results have been published about fade slope statistics at -band frequencies [3], where mitigation techniques are even more necessary. Whereas at lower frequencies fade is mainly caused by rain, clouds contribute to the total path attenuation in the -band with significant values, as reported in [4] may also affect the statistics of fade slope, particularly for low attenuation values. In this context, statistics of fade slope have been produced from one year of attenuation data.…”

Section: Introductionmentioning

confidence: 76%

Fade Slope Statistics on a Slant Path at 50 GHz

Garcia‐del‐Pino¹,

Riera

Benarroch

2010

Antennas Wirel. Propag. Lett.

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Statistics of fade slope at 50 GHz have been derived from one year of slant path attenuation measurements, using time interval lengths between 2 and 200 s. From these statistics, the dependence of fade slope on the attenuation level and time interval can be quantified. It has been found that the ITU-R model, specified for frequencies up to 30 GHz, fits well the experimental conditional distributions. Nevertheless, some divergences are observed for the lowest attenuations, which may be attributed to cloud effects. Such results are required for the design of communications systems operating in the -band.

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Section: Introductionmentioning

confidence: 76%

Fade Slope Statistics on a Slant Path at 50 GHz

Garcia‐del‐Pino¹,

Riera

Benarroch

2010

Antennas Wirel. Propag. Lett.

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“…The ILWC corresponding to each vertical profile has been computed by numerical integration of w c . Due to the good behavior of the Salonen model [19] in Madrid's climate, observed during previous propagation experiments [27], it has been used to detect the presence of clouds and estimate the value w c . The yearly time series of ILWC for the period under study is shown in Fig.…”

Section: Application Of the Methodsmentioning

confidence: 99%

Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

Soria¹,

Riera²,

Garcia‐del‐Pino³

et al. 2012

PIER

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Abstract-The influence of atmospheric gases and tropospheric phenomena becomes more relevant at frequencies within the THz band (100 GHz to 10 THz), severely affecting the propagation conditions. The use of radiosoundings in propagation studies is a well established measurement technique in order to collect information about the vertical structure of the atmosphere, from which gaseous and cloud attenuation can be estimated with the use of propagation models. However, some of these prediction models are not suitable to be used under rainy conditions. In the present study, a method to identify the presence of rainy conditions during radiosoundings is introduced, with the aim of filtering out these events from yearly statistics of predicted atmospheric attenuation. The detection procedure is based on the analysis of a set of parameters, some of them extracted from synoptical observations of weather (SYNOP reports) and other derived from radiosonde observations (RAOBs). The performance of the method has been evaluated under different climatic conditions, corresponding to three locations in Spain, where colocated rain gauge data were available. Rain events detected by the method have been compared with those precipitations identified by the rain gauge. The pertinence of the method is discussed on the basis of an analysis of cumulative distributions of total attenuation at 100 and 300 GHz. This study demonstrates that the proposed method can be useful to identify events probably associated to rainy conditions. Hence, it can be considered as a suitable algorithm in order to filter out this kind of events from annual attenuation statistics.

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“…Ice clouds, by virtue of the low dielectric constant of ice and the small size of the constituent particles, are not expected to cause appreciable attenuation to radiowaves in the frequency range below 50 GHz [2]. It has been reported by researchers [5] that clouds density and concentration varies from 0.15 g/m 3 to 1 g/m 3 and 70 per cm 3 to 450 per cm 3 , respectively.…”

Section: Experimental System Configurationmentioning

confidence: 98%

Microwave and Millimeter Wave Characteristics and Attenuation of Clouds over some Malaysian Equatorial Stations

Mandeep

Hassan

2008

Int J Infrared Milli Waves

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Based on radar range height indicator (RHI) measurements, cloud characteristics in relation to radiowave propagation over three locations in different geographical region in western Malaysia have been presented. It is seen that low cloud occurrence over these locations are quite significant. Cloud attenuation and noise temperature can result in serious degradation of telecommunication link performances. This paper presents cloud coverage in different months, 0°C isotherm height and cloud attenuation results at 12 GHz, 20 GHz, 36 GHz, 50 GHz, 70 GHz and 100 GHz over measurement site. The low level cloud over the measurement sites has been found to occur for many days and nights and particularly in the months of April to May and October to December. Such results are useful for satellite communication and remote sensing application in Malaysia.

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One-year cloud attenuation results at 50 GHz

Cited by 20 publications

References 6 publications

Fade Slope Statistics on a Slant Path at 50 GHz

Fade Slope Statistics on a Slant Path at 50 GHz

Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

Microwave and Millimeter Wave Characteristics and Attenuation of Clouds over some Malaysian Equatorial Stations

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