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• W2182424319 abstract "In this paper, the results of the dynamic aspects of the statistical analysis of slant path attenuation at the Ku band in several sites throughout Brazil are presented and discussed. Results from radiometric measurements are compared with results from beacon data. Parametric estimation of the cumulative distribution function of event durations and number of events indicates that the Weibull distribution may provide the best overall fit. Regional differences on the location of events throughout the day completes the paper. The dynamic aspects of the statistics of attenuation are concerned with the probability distribution functions of two random variables: the number of events of a certain attenuation threshold being exceeded and the individual duration of such events. In short, it is the level crossing problem applied to the times series of attenuation. Unlike the cumulative distribution, from which little information can actually be drawn, the statistical analysis of individual attenuation thresholds provides a full dissection of the fading phenomenon. The information that the dynamic analysis provides can be of use in several key design issues such as building efficient adaptive power control algorithms, reliability evaluation of a link, availability calculations and more. In some of the sites a satellite beacon receiver and a radiometer at 12GHz, together with a tipping bucket raingauge were installed. In the remaining sites only a 12GHz radiometer was used. The sites are located within three of the four macroclimatic regions of Brazil as follows: Three sites in the equatorial climate region, ITU-R climate P, in a total of 9 years (5 with radiometric information only); Four sites in the tropical climate region , ITU-R climate N, in a total of 16 years (9 with radiometric information only) and two sites in the subtropical climate region, ITU-R climate N, in a total of 3 years. Among the results presented are the parametric estimation of the distributions of number and duration of events based on the two most used distributions in reliability theory: lognormal and Weibull. As is the case with the cumulative distribution of attenuation, the distributions of individual thresholds can also present more than one mode, mainly if the thresholds are located within regions in which effects of both stratiform and convective rain combine. To evaluate the existence of such modes and to what range in attenuation they span, a nonparametric analysis using adaptive histograms is applied together with a competitive risks approach. Finally, the diurnal distribution of events is also presented for all sites. This study allows the mapping of troublesome parts of the day, during which Earth-space communications are the most impaired. EXPERIMENTAL SET-UP The receiver sites are located throughout the Brazilian territory, from latitudes of -1 to -30 degrees. The sites descriptions are presented in Tab. 1. The receiver antennas have all a" @default.
• W2182424319 created "2016-06-24" @default.
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• W2182424319 date "2000-01-01" @default.
• W2182424319 modified "2023-09-23" @default.
• W2182424319 title "A COMPREHENSIVE STUDY OF SLANT-PATH ATTENUATION IN BRAZIL SECOND PART: DYNAMIC STATISTICS" @default.
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