Rain Attenuation on Earth-Satellite Paths-Summary of 10-Year Experiments and Studies

Lin, S. H.; Bergmann, H.; Pursley, M. V.

doi:10.1002/j.1538-7305.1980.tb03003.x

Cited by 72 publications

(28 citation statements)

References 26 publications

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“…In the light of the predominant wind directions depicted in Figure 15 for the two sites, this result suggests that, on the average, rain fields are elongated towards the N-S direction in Bordeaux, whereas in Spino they are rather stretched towards the W-E direction: as a result, in both locations, the most advantageous baseline orientation is parallel to the predominant wind direction. The effect of the wind flows on rain structures is confirmed also by Figure 18, where the overall spatial correlation has been calculated from all the rain maps of Bordeaux using the spatial spectrum technique [8]: indeed, results indicate a slight anisotropy of the field, which actually tends to be more correlated along the N-S direction than along the W-E one.…”

Section: Impact Of the Wind Direction On The Rain Field Spatial Anisosupporting

confidence: 56%

“…In fact, a visual inspection of radar data suggests that, most of the time, rain structures tend to stretch orthogonally to the rain field advection direction. More details about this effect, which has already been noticed in [7,8], will be given in Sections 4 and 5, which also suggest how to derive the preferential direction of the rain field advection from the ERA-40 database.…”

Section: Gain Dependence On the Baseline Orientationmentioning

confidence: 98%

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Weather radar data for site diversity predictions and evaluation of the impact of rain field advection

Luini

Jeannin²,

Capsoni

et al. 2010

Satell Commun Network

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This paper presents the analysis on two weather radar datasets, collected at Spino d’Adda (Italy) and Bordeaux (France), for the simulation and the performance evaluation of a site diversity system. Results from the two locations are compared and the impact of different factors such as the baseline and link orientation is assessed and related to the local climatologic characteristics. The results obtained are then compared with the model currently recommended by the ITU-R for the estimation of the site diversity performance. A linkage is then established between the preferable baseline orientation and the predominant direction of the rain field advection. The rain field displacement is finally shown to be well approximated by the wind speed and direction relative to the 700 hPa isobar extracted from the ECMWF ERA-40 meteorological database

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Section: Impact Of the Wind Direction On The Rain Field Spatial Anisosupporting

confidence: 56%

Section: Gain Dependence On the Baseline Orientationmentioning

confidence: 98%

Weather radar data for site diversity predictions and evaluation of the impact of rain field advection

Luini

Jeannin²,

Capsoni

et al. 2010

Satell Commun Network

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“…jointly log normal (a log-normal model to describe the statistical behaviour of rain-attenuation A has been suggested in the literature a long time ago; see [10][11][12]). This fundamental property is assumed as a basic paradigm throughout the whole following work: indeed it allows evaluating any sort of functional including the spread of one variable (e.g.…”

Section: The Modelmentioning

confidence: 99%

Modelling of short‐term frequency scaling for rain attenuation using ITALSAT data

Bertorelli

Paraboni

2006

Satell Commun Network

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SUMMARYIn this article we describe a statistical model for the assessment of the short-term frequency scaling ratio between rain attenuations at cm and mm wavelengths, taking into consideration the fluctuations arising from the type of rain (mainly the raindrop size distribution). The model has been derived from measured data, using the large attenuation database collected in Spino d'Adda, Italy, during the ITALSAT 8-years experiment at 18.7, 39.6 and 49:5 GHz; but can be applied to any pair of frequencies. By applying the model it is possible to generate, by means of a generator of random Gaussian numbers, samples of the up-link attenuation, for a given down link attenuation, to be employed in the simulation of up-link power control (ULPC) slant path channels.

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“…The basic hypothesis of the model utilized in this paper is that the single site and the joint probability of rain attenuation for N -locations have log-normal behaviours [11,12,16]. The state of the N locations is described by means of an N -dimensional binary variable ('rainy' or 'non-rainy') with the associated multi-variate probability function.…”

Section: Statistical Modelsmentioning

confidence: 99%

“…Until now, the performance of such a technique has been investigated through measurement campaigns [3,10] and through the development of statistical models. The use of a log-normal model for the single-site distribution of rainfall intensity and rain attenuation was proposed [11,12]. For low values of rain attenuation, this model is still widely accepted and the assumption of log-normality in the case of many sites appears as a natural extension of this model [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Large‐scale site diversity for satellite communication networks

Luglio

Mancini

Riva

et al. 2002

Int. J. Satell. Commun.

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SUMMARYThe utilization of high frequencies, such as Ka-band and beyond, necessary to avoid the highly congested lower satellite frequencies and to get larger bandwidth availability is considered for many developing satellite systems.The new satellite low-margin systems in Ka-band will need to be designed using fade countermeasures to counteract rain attenuation. One of these techniques foresees the possibility of switching the communication link among different Earth stations spread on a very large territory to reduce the system outage time to the joint outage time of all the stations.The design of such systems depends on the probability that the Earth stations simultaneously exceed their margins.In this paper, a well-assessed model is utilized for the prediction of joint statistics of rain attenuation in multiple locations, using Monte Carlo simulation. The model is based on a pair of multi-variate normal processes whose parameters are related to those characterizing the single-location statistics and whose covariance matrices are assumed to depend only on the distances between locations.The main results concerning both the probability and margin improvement will be presented and discussed.

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Rain Attenuation on Earth-Satellite Paths-Summary of 10-Year Experiments and Studies

Cited by 72 publications

References 26 publications

Weather radar data for site diversity predictions and evaluation of the impact of rain field advection

Weather radar data for site diversity predictions and evaluation of the impact of rain field advection

Modelling of short‐term frequency scaling for rain attenuation using ITALSAT data

Large‐scale site diversity for satellite communication networks

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