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 gauge records show short intervals of higher rain rate imbedded in longer periods of lighter rain. It was found that rp decreases with the path length and the point rainfall rate, as depicted in Figs. The diameter d 0 of the equivalent cell is empirically derived from experimental data, depending on the long-term point rainfall rate measured in the region.
The scattering is associated with modifications of wave propagation directions to satisfy boundary conditions at the raindrops surfaces. Panagopoulos and John D. An improved prediction method of rain attenuation for terrestrial light-of-sight path”, 19 September When l.530-13 against measurements, the Da Silva Mello method yields a significant improvement for the prediction of rain attenuation complementary cumulative distribution functions CCDFs over iitu-r regions, compared to other models.
But this potential reduction will be canceled or completely reversed if the link is located at low altitudes and has a low path inclination.
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Unified method for the prediction of rain attenuation in satellite and terrestrial links
The horizontal path reduction factor previously obtained from terrestrial measurements is kept, what ensures consistence between the slant path and terrestrial links cases. This value is usually speci? 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 iu-r distribution can be calculated by.
The analysis of all measurements over the six links during two years — leads to the following observations and conclusions. Lin, “A method for calculating rain attenuation distributions on microwave paths”, Bell Syst. Some methods derive the statistical profile of rain p.53013 the path assuming a single cell of suitable shape , or a statistical distribution of sizes for cells of a particular shape , , .
From 12 to 13, there is a radical change in the expression of the geoclimatic K factor and the worst month probability of unavailability. Tests with satellite links P.30-13 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.
Unavailability with diversity over 20 links in Qu? Impact of Geoclimatic Parameters The parametrical studies are useful to give a better understanding of the impact of a single parameter or a group of parameters. Nevertheless, the itk-r variation of waves propagation remained a challenging issue, that Scienti? Finally, two year measurements data of? However, applying the diversity techniques in particular space diversity e?
Propagation data and prediction methods required for the. An alternative procedure is to apply the reduction coefficient to the actual path length, which yields an effective path length over which the rain intensity may be assumed to be constant , , , .
Such observations are iyu-r of all occurrences of rain in all climate regions. Consistency between the terrestrial and the slant path cases was also achieved, which is not present in any of the methods tested. List of the itu r recommendations related to the cpm report to wrc03 chapter 1 radionavigation, radionavigationsatellite and radiolocation services recommendation. Rainfall is often described as widespread or stratiform and as convective, but the differences between these types usually lie in the maximum rain rate to be associated with the rain process and not in differences in spatial variability.
Finally, the analysis of diversity improvement factors show a good agreement between measurements and prediction for frequency and space diversity using 2 receivers but the improvement factor when 4 receivers are applied is low compared to ITU prediction. 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 accessible functions allow the computation of the following values.
As it might be expected, taking into account the radio signature greatly degrades the total outage probability if no diversity technique is applied. Calculations of microwave and millimeter wave regions”, J. This paper addresses the recent evolution of this method and presents some experimental validation examples.
Another important limitation is that, when tested against the experimental data now available, the terrestrial prediction method shows significant underestimation of the measured attenuations.
Some 16 proposed new satellite systems operating at 36 to 46 ghz qband and 46 to 56 ghz vband have been proposed to the u. Rain attenuation statistics over a terrestrial link at This allows the use of the full rainfall rate distribution for the prediction of the rain attenuation distribution and the unification of the slant path and terrestrial links prediction algorithms.
Irjetempirical field strength model for terrestrial. Some attempts to modify the ITU-R method and improve its accuracy have recently been made , , , .
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. For space Pw frequency and space diversity 2 receivers vs. Radio links interference analysis interference level prediction net filter discrimination.
In our studies, 20 links located in Quebec, Canada, are designed based on real-world parameters. Selective outage probability as function of radio signature parameters. The raindrops behave as dissipative dielectric media to the incident wave.
A prediction model for terrestrial or L. For percentages of time between 0. The concept of an effective rainfall rate was introduced, in order to avoid path correction factors larger than the unity.
Recently, there has been extensive work being carried out in time series synthesizers to provide synthesized rain attenuation time series . It can be observed in Fig. Matricciani, “Global formulation of the Synthetic Storm Technique to calculate rain attenuation only from rain rate probability distributions”, Antennas and Propagation Symposium, Other methods characterize the statistical rain profile simply by a reduction coefficient, which may be derived from the spatial p.30-13 function of rainfall, from measurements using rapid response rain gauges spaced along a line  or from a semi-empirical law.
The main changes are highlighted in the equations below: The proposed method was tested against the ITU-R methods and other methods proposed in the technical literature, using the test variable recommended by the ITU-R .