Inter‐annual variability, risk and confidence intervals associated with propagation statistics. Part II: parameterization and applications

Boulanger, Xavier; Jeannin, Nicolas; Féral, Laurent; Castanet, Laurent; Lacoste, F.

doi:10.1002/sat.1059

Cited by 11 publications

(21 citation statements)

References 19 publications

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“…P. 841-4 [8].Thus, the variability of propagation phenomena is not well-addressed in propagation models. Regulatory documents, such as [9,10], partially deal with this subject, which is of growing interest, as shown for example in [11]. Studies on the variability of the propagation measurements from experimental results are very scarce, being [12][13][14] some of the few examples that can be found in the literature.…”

mentioning

confidence: 99%

Experimental assessment of slant-path rain attenuation variability in the Ka-band

Garcia-Rubia

Riera

Garcia‐del‐Pino

et al. 2015

Int. J. Satell. Commun. Network.

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This study is based on the results of a slant-path Ka-band propagation experiment carried out in Madrid, Spain, regarding rain attenuation, which is the main propagation impairment in this frequency band. The experimental and statistical results correspond to seven complete years of measurements, a period large enough to accomplish a comprehensive analysis in order to characterize the variability of rain rate and attenuation. It is shown that year-to-year variability is significant in temperate climates as Madrid's. The aforementioned significance is also apparent with regards to seasonal, monthly, worst-month and hourly variability concerning rain attenuation, which are also discussed and related when possible to the variability of the rain phenomena, either represented by the total amounts of rainfall in the different periods or by rain rate statistics.Report of COST Action 255 [4], or the more recent National Technical University of Athens model [5], or the Synthetic Storm Technique (SST) [6], in addition to the global models for rain rate included in ITU-R Rec. P. 837-6 [7]. Procedures to predict worst-month statistics from average-year predictions or measurements are described in ITU-R Rec. P. 841-4 [8].Thus, the variability of propagation phenomena is not well-addressed in propagation models. Regulatory documents, such as [9,10], partially deal with this subject, which is of growing interest, as shown for example in [11]. Studies on the variability of the propagation measurements from experimental results are very scarce, being [12][13][14] some of the few examples that can be found in the literature. Another approach is the simulation of propagation results starting from long-term rain rate data that are converted into attenuation data using the SST. The variability of the resulting propagation results can be analyzed as was performed, for example, in [15,16]. The variability of rain rate statistics has also been addressed in a few papers [17][18][19][20][21].In this paper, the variability of rain rate and rain attenuation is assessed, making use of the results of a long-term propagation experiment carried out in Madrid, Spain. The Ka-band beacon of the Eutelsat Hot Bird 13A satellite (previously known as Hot Bird 6) has been continuously measured since June 2006 to the first days of July 2013, when the beacon was switched off as part of the process of reconfiguring the satellite to a different orbital position. The period of measurements includes seven complete years, which allows a comprehensive characterization of the propagation channel. The minimum number of years of measurements needed to take into account the natural variability of the rain phenomena and their effects on propagation has been discussed for a long time. A study of long-term rain rate data [17] concludes that seven is the minimum number of years for which most of the averages (of individual distributions) fall within the 5-95% confidence limits of the long-term (49 years) distribution. According to this study, longer periods, such as 1...

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mentioning

confidence: 99%

Experimental assessment of slant-path rain attenuation variability in the Ka-band

Garcia-Rubia

Riera

Garcia‐del‐Pino

et al. 2015

Int. J. Satell. Commun. Network.

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“…The temporal resolution of ANS data is 5 minutes, which is deemed sufficient to catch the variability of gaseous (slow varying) attenuation making possible to use ANS data in clear air conditions and beacon measurements to identify the 0-dB reference level and to derive total atmospheric attenuation. In addition, the spatial and temporal resolution of the current ANS process could be sufficient to reproduce the dynamic of rain attenuation for percentages of time lower than 0.1% (see previous literature 49,50 ). It still remains to be investigated the applicability of ANS data for the derivation of cloud and rain attenuation, considering that the max value of attenuation of ANS data is only limited by spatial and temporal resolution whilst VSAT class propagation terminals have a limited dynamic range.…”

Section: Simulated Time Series Of the Attenuationsmentioning

confidence: 99%

Assessment of spatial and temporal properties of Ka/Q band earth‐space radio channel across Europe using Alphasat Aldo Paraboni payload

Ventouras

Martellucci

Reeves

et al. 2019

Satell Commun Network

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Summary The upcoming migration of satellite services to higher bands, namely, the Ka‐ and Q/V‐bands, offers many advantages in terms of bandwidth and system capacity. However, it poses challenges as propagation effects introduced by the various atmospheric phenomena are particularly pronounced in these bands and can become a serious constraint in terms of system reliability and performance. This paper presents the goals, organisation, and preliminary results of an ongoing large‐scale European coordinated propagation campaign using the Alphasat Aldo Paraboni Ka/Q band signal payload on satellite, performed by a wide scientific consortium in the framework of a European Space Agency (ESA) project. The main objective of this activity is the experimental characterisation of the spatial and temporal correlation over Europe of the radio channel at Ka and Q band for future modelling activities and to collect data for development and testing of fading mitigation techniques.

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“…However, because of the large yearly variability of rain phenomena 31,32 and in particular in Madrid as shown in Garcia-Rubia et al, 33 3 years is too short a period to obtain a reliable estimation of the average year rain regime. In fact, the period has been markedly dry, in comparison with longer-term statistics, in particular with regards to high rain-rate convective events, which have the most relevant impact in propagation.…”

Section: First-order Statisticsmentioning

confidence: 99%

Three‐year fade and inter‐fade duration statistics from the Q‐band Alphasat propagation experiment in Madrid

Pimienta‐del‐Valle

Riera

Garcia‐del‐Pino

et al. 2018

Satell Commun Network

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Summary Propagation campaigns are carried out at different frequencies and geographical areas to characterize the slant‐path propagation channel. One of the objectives of the Alphasat Propagation Experiment is to evaluate the performance of satellite links that operate in the Q/V band. Since March 2014, the copolar level of the Alphasat Q‐band beacon signal has been measured at Universidad Politécnica de Madrid, Spain. The fade dynamics—fade and inter‐fade durations—results for three complete years (March 2014 to February 2017) of measurements are presented in this paper. Moreover, the experimental setup and receiver characteristics are described in detail. The collected data (with a mean availability of 97%) can be used to evaluate the atmospheric propagation impairments with a very good degree of accuracy. The probability of occurrence and the fraction of time of fade duration for an average‐year have been compared with the ITU‐R and CRC models with moderate agreement. For this reason, a modeling effort has been made leading to the conclusion that there is room for improvement in the models.

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Inter‐annual variability, risk and confidence intervals associated with propagation statistics. Part II: parameterization and applications

Cited by 11 publications

References 19 publications

Experimental assessment of slant-path rain attenuation variability in the Ka-band

Experimental assessment of slant-path rain attenuation variability in the Ka-band

Assessment of spatial and temporal properties of Ka/Q band earth‐space radio channel across Europe using Alphasat Aldo Paraboni payload

Three‐year fade and inter‐fade duration statistics from the Q‐band Alphasat propagation experiment in Madrid

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