Analysis of experimental results on microwave propagation in Singapore's tropical rainfall environment

Cumulative distributions of rainfall rate and microwave attenuation in Singapore's tropical region

“…From Figure 3 we note the following: 1. As stated by Yeo et al [1993] and Zhou et al [1999], the CCIR prediction has underestimated the specific attenuation level for a specific percentage time between 0.01% and 0.5% in tropical regions like Singapore.…”

“…As described previously, the experimental results obtained in Singapore differ a lot from the CCIR predictions. We have given some simplified formulae [see Zhou et al, 1999] to predict the attenuation and attenuation duration statistics for tropical rainfall. A very simple linear relationship exists for the 10-month experiment period between the attenuation and the logarithm of the percentage time exceeding a preset attenuation level.…”

“…In section 3 the rainfall rate cumulative distribution is given and is compared with that of CCIR recommendations. Section 4 proposes the cumulative attenuation distribution due to rainfall of a type different from that of Zhou et al [1999]. In section 5 the specific rainfall attenuation versus the rainfall rate has been studied from the view of cumulative distributions.…”

“…With the increasing requirement and establishment of more and more communications systems, it becomes necessary to study the microwave attenuation , 1990] are mainly applicable to regions of higher latitude, whereas the results available for the tropical regions are quite limited. When the International Radio Consultative Committee (CCIR) recommended model is applied to the tropical regions, the inaccuracies of these empirical formulae are clearly seen [Manabe et al, 1987;Yeo et al, 1990Yeo et al, , 1993Zhou et al, 1999].…”

“…To study the microwave propagation characteristics, experiments have been carried out in Singapore [Yeo et al, 1990]. Previously published articles [Yeo et al, 1990[Yeo et al, , 1993Zhou et al, 1999] have introduced the setup of the experiment, analyzed the microwave attenuation due to rainfall at 21.225 GHz, proposed the cumulative distributions of attenuation and attenuation duration at frequencies of 15 and 38.6 GHz, Copyright 2000 by the American Geophysical Union.…”