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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List of the itu r recommendations related to the cpm report to wrc03 chapter 1 radionavigation, radionavigationsatellite and radiolocation services recommendation. Table II and Figs. The test results indicate that, for the terrestrial case, the proposed method provides a large improvement over the method currently recommended by the ITU-R.
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. Theoretical Prediction curve is an upper bound which is validated during the link measurement duration 2 years.
The diameter d 0 of the equivalent cell is empirically derived from experimental p.530-113, depending on the long-term point rainfall rate measured in the region. 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. Effective path length for slant paths The model for the effective path length can be p.5300-13 for the slant path case by considering the rain height.
Climatic conditions are also taken into account using local rain database. International telecommunication union, propagation data and prediction methods required itu-e the design of terrestrial lineofsight systems, itur p. It can be observed in Fig. The dependence of the effective rain rate on p.5300-13 parameters was investigated, using experimental data from concurrent long-term measurements of point rainfall rate and rain attenuation in slant path links available in the ITU-R igu-r .
The accessible functions allow the computation of the following values.
Link Calculation » ALCOMA
For the equivalent cell diameter d 0it was found that a power-law could provide better results than the exponential law used in the current ITU-R method. 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.
The basic assumption in these methods is that an equivalent cell of uniform rainfall rate can model the non-uniform rainfall along itu-g propagation path. Based on these observations, and after a series p.530–13 trials with different functions, the following expression was chosen to fit R eff.
The rain height is defined as a function of the p.503-13 degree isotherm height, which is mapped all over the world and given in Rec. In the slant path prediction method, given in Rec. The validation of each new revision is confronted to measurements data collected over the world and available in SG3 database.
There is a huge dispersion of the distribution of fading from month to month.
The terrestrial prediction method, given in Rec. The performance is essentially equivalent to that of the method proposed by China, which presents inconsistencies from the physical point of view. To avoid inconsistencies and retain the general expression for d eff given by 1the concept of an effective rainfall rate was introduced.
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. Prospects for commercial satellite services at q and vbands. For other percentages of time, the attenuation is obtained using an extrapolation function.
Computation in accordance with the recommendations itu r sm. Propagation data and prediction methods required for the design of terrestrial lineof-sight systems”, 12 November 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. As it might be expected, taking into account the radio signature greatly degrades the total outage probability if no diversity technique is applied.
In this paper, a semi-empirical method for the prediction of rain attenuation in slant paths and terrestrial links is proposed. Assuming that this equivalent rain cell may intercept the link at any position with equal probability, the expression for an effective path length is calculated. Likewise for equipments, radio signature and antenna cross-polarization discrimination highly reduce the overall performance p5.30-13 terms of link availability.
Itu r p 530 13 pdf file
As a starting point, the dependence of the reduction factor itu-f link parameters was investigated, using experimental data from concurrent long-term measurements of point rainfall rate and rain attenuation in terrestrial links available in the ITU-R databanks . The expression obtained is given in 6. The horizontal path reduction factor previously obtained from terrestrial measurements is kept, what ensures consistence between the slant path and terrestrial links cases.
Worst month unavailability as function of multipath fade occurrence factor.