ITU-R P.530-13 PDF
P Draft revision of Recommendation ITU-R P – Propagation data and prediction methods required for the design of terrestrial. ITU-R WP3M Contribution Title: On the development of Recommendation ITU-R P – Prediction of autage intensity for digital line-of-sight systems. ITU-R P 4. 1. 0. – B. D. Ad. – 1. 0. 1. – – GHz 2. % ke.. (dB) h/F1. B.: D.: GHz 6,5. 4/3 = ke. Ad.: (2) h.
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Rain attenuation statistics over a terrestrial link at The terrestrial prediction method, given in Rec. The values of R eff were obtained from the measured distribution of attenuation and rainfall rate by. It also represents a challenging task in terms of updating the simulation and design tools to re? User Username Password Remember me.
Itu r p 530 13 pdf file
To obtain a more general prediction method that includes the slant path case but is still consistent with the terrestrial case, the rain attenuation cumulative probability distribution can be calculated by. The international telecommunication union radiocommunication itu r rec.
Pdf the jtu-r of terrain roughness in the microwave line.
Enterprise class a4 colour mfps designed to integrate. Da Silva Mello, L. This represents a shortcoming of the method, as in two regions with different distributions of point rainfall rate but similar values of R 0.
Locations and main parameters of links. For example, the combined e? For example a high roughness can reduce the K factor and consequently the outage probability. Recommendation itu r r presents propagation data for planning terrestrial lineofsight radio systems, typically operating in frequency bands between 1 ghz and 45 ghz, and gives stepbystep methods for predicting the performance of these systems for percentage times down to 0.
Climatic conditions are also taken into account using local rain database. This means that the method will provide the same results for two sites that have the same value for the rainfall rate exceeded at 0. A prediction model for terrestrial or L.
The only other method that provides similar results is the China’s method, which uses one single point of the rainfall rate distribution to predict the attenuation distribution. The month to month cap varies from 1 dB to 20 dB. Vilar, “The spatial distribution of rain and its implications for wide area communications systems”, ICAPExeter.
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The performance of each method is measured by the average value and the standard deviation of the values of test variable calculated for all links, at all percentages of time for which measured data are available.
Pdf the effect p.5330-13 terrain roughness in the microwave. Table II and Figs. The numerical coefficients in the method were derived by multiple non-linear regressions using the experimental data of rain attenuation in terrestrial links currently available in the ITU-R data banks.
P.5300-13 prediction method for terrestrial links A modified method has been proposed  that addresses some of the problems found in the current ITU-R method but retains the general expression for d effwhich is the basis of the model, and uses the full rainfall rate distribution at the links region as input for the prediction of the cumulative distribution of rain attenuation.
The model for the effective path length can be extended for the slant path case by considering the rain height. However, applying the diversity techniques in particular space diversity e? Rain attenuation effective path length”, 17 May ltu-r The basic assumption in these methods is that an equivalent cell of uniform rainfall rate itu–r model the non-uniform rainfall along the propagation path.
An alternative, semi-empirical method for the prediction of rain attenuation in terrestrial links was recently proposed , which addresses the problems observed in the current ITU-R method. The expression obtained is given in 6. The main changes are highlighted in the equations below: The dependence of the effective rain rate on link parameters was investigated, using experimental data itu-rr concurrent long-term measurements of point rainfall rate and rain attenuation in slant path links available in the ITU-R databanks .
Mean error between prediction and measurements measured on the receiver site. As a result of these assumptions the effective path length is always smaller than the actual path length, leading to the definition of a itu-f reduction factor. Although the K-factor decreases itu- One shortcoming of the current ITU-R methods is that the attenuation is predicted using only the measured rainfall rate exceed at 0.
Unified method for the prediction of rain attenuation in satellite and terrestrial links
The detailed link pro? Propagation data and prediction methods required for the design of terrestrial line-of-sight systems, The empirical expression obtained for this effective rainfall rate in given by 5. The rain height is defined as a function of the zero degree isotherm height, which is mapped all over the world and given in Rec. The attenuation by hydrometeors is speci? Rain attenuation statistics from rain cell diameters and heights.
All the links operate at 7.
Only data from beacon measurements not data from radiometer measurements with concurrent measurements of rainfall rate itu- considered. Tests with satellite links For the slant path case, the data used to test the prediction methods includes concurrent measurements of rainfall rate and rain attenuation in received satellite beacon signals, also available in the ITU-R databank , comprising a total of year-stations from 68 sites in 24 countries.
Test results indicate that the proposed method provides a large improvement over the one currently recommended by the ITU-R for prediction iu-r rain attenuation in terrestrial links.
Iru-r to cite this article. Paraboni, “A comprehensive meteorologically oriented methodology for the prediction of wave propagation parameters in telecommunication applications beyond 10 GHz”, Radio Science, vol.
Set of rain factor press on rain symbol select itur p