A novel method for predicting site dependent specific rain attenuation of millimeter radio waves

Åsen, Walther; Tjelta, Terje

doi:10.1109/tap.2003.818005

Cited by 13 publications

(6 citation statements)

References 15 publications

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“…A few attempts have been made to characterize the rain attenuation over this region [4][5][6][7][8]. In the absence of measured attenuation data, DSD measurements can provide useful information on the variation of the rain attenuation [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Das¹,

Maitra²,

Shukla³

2010

PIER B

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Abstract-Rain drop size distributions (DSD) are measured with disdrometers at five different climatic locations in the Indian tropical region. The distribution of drop size is assumed to be lognormal to model the rain attenuation in the frequency range of 10-100 GHz. The rain attenuation is estimated assuming single scattering of spherical rain drops. Different attenuation characteristics are observed for different regions due to the dependency of DSD on climatic conditions. A comparison shows that significant differences between ITU-R model and DSD derived values occur at high frequency and at high rain rates for different regions. At frequencies below 30 GHz, the ITU-R model matches well with the DSD generated values up to 30 mm/h rain rate but differ above that. The results will be helpful in understanding the pattern of rain attenuation variation and designing the systems at EHF bands in the tropical region.

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Section: Introductionmentioning

confidence: 99%

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Das¹,

Maitra²,

Shukla³

2010

PIER B

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show abstract

“…In the current state of affairs, diurnal as well as seasonal variations of the attenuation due to rain have been studied over different locations of the world to assess its temporal and spatial variability [4], [5]. Studies on rain attenuation in tropical and temperate regions at various frequency bands facilitated the selection of suitable Fade Mitigation Technique to increase data rates and link availabilities [3], [6]- [8]. However, though many propagation campaigns were undertaken in Europe and the USA (Olympus, Italsat, ACTS), actual signal measurements in tropical regions are still limited [3].…”

Section: Introductionmentioning

confidence: 99%

Non-Rainy Attenuation Over Earth-Space Paths at Tropical and Temperate Sites Using Meteorological Data and NWP Products

et al. 2021

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A long-term investigation of the attenuation in non-rainy conditions has been carried out, for a tropical and a temperate location, using meteorological data and NWP (Numerical Weather Prediction) products during the period 2011-2015. The results show that ERA-5 full profiles are appropriate to estimate non-rainy attenuation in lieu of radiometric or radiosonde observations. Simpler regression-based methods are established. A new formulation for oxygen attenuation is introduced, which only requires surface temperature and pressure. Mass absorption coefficients are used for water vapour and cloud attenuation. Simpler regression-based approaches are then validated. This study would facilitate the planning of global mobile satellite communication systems.

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“…The precipitation leads to degradation in the desired quality of service and link availability. Raindrops, in particular, absorb and scatter radio wave energy [ Åsen and Tjelta , ; Moupfouma , ]. Rain attenuation affects both Earth to satellite links and terrestrial links, although it is a particular problem for services such as high‐definition satellite TV.…”

Section: Introductionmentioning

confidence: 99%

Modeling rainfall drop size distribution in southern England using a Gaussian Mixture Model

et al. 2015

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Understanding and modeling the rainfall drop size distribution is important in a number of applications, in particular predicting and mitigating attenuation of satellite signals in the millimeter band. Various standard statistical distributions have been proposed as suitable models, the first widely accepted being the exponential distribution. Subsequently, gamma and lognormal distributions have been shown to provide better rainfall rate computations. Some empirical studies have revealed bimodal distributions under some circumstances. A natural question to ask therefore is how often gamma and lognormal distributions fit the empirical data. In this paper we fit lognormal and gamma distributions to 1 min slices of rainfall drop size distributions taken from 7 year data from the Chilbolton Observatory in southern England. The chi-square goodness of fit of the models against the data is calculated, and it is found that failure to fit is greater than would normally be expected. This failure to fit is broken down and examined against seasonal variations, different rain rates, atmospheric temperature, and wind speed. Possible reasons for the lack of fit are explored, and alternative fits using models based on Gaussian Mixture Models are developed and found to be an improvement. DSD Modeling Standard Statistical ModelsRaindrop size distribution, denoted N(D) and expressed in mm À1 m À3 , is defined as the number of raindrops per unit volume per unit diameter, centered on D (in mm). Thus, N(D)dD, expressed in m À3 , is the number of such drops per unit volume having diameters in the infinitesimal range (D À dD/2, D + dD/2) of size dD centered on D. Various standard classical statistical distributions have been proposed in literature as models EKERETE ET AL.MODELING RAINFALL DSD WITH A GMM 876 PUBLICATIONS

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A novel method for predicting site dependent specific rain attenuation of millimeter radio waves

Cited by 13 publications

References 15 publications

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

RAIN ATTENUATION MODELING IN THE 10-100 GHz FREQUENCY USING DROP SIZE DISTRIBUTIONS FOR DIFFERENT CLIMATIC ZONES IN TROPICAL INDIA

Non-Rainy Attenuation Over Earth-Space Paths at Tropical and Temperate Sites Using Meteorological Data and NWP Products

Modeling rainfall drop size distribution in southern England using a Gaussian Mixture Model

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