Abstract
AbstractA simple, low‐cost propagation terminal for measuring path attenuation and site diversity, using satellite transmissions at 12 GHz, is described. The novelty of this system is the use of a standard domestic satellite low‐noise block (LNB) front‐end connected directly to a spectrum analyser in place of an expensive beacon receiver. A description of the equipment, an analysis of relevant system parameters, and a discussion of the environmental conditions are presented. The method used to obtain a clear‐sky baseline reference and a description of the channel signal processing are given. Analysis of the rainfall rate and attenuation exceedances statistics has led to the proposal of a new model to derive the effective rain‐cell diameters and effective rain‐column heights in tropical areas for attenuation predictions in satellite communication link budget calculations. Site‐diversity statistics are also examined. Though the main site is only 6.5 km inland from the second coastal site, there are marked differences in their rain‐cell characteristics. The significance of volume saturation of rain cells on modelling, the operating margins of the measuring system, and the relevance of the site‐diversity data to enhancing the understanding of the proposed volume saturation model are discussed. Copyright © 2001 John Wiley & Sons, Ltd.
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