Predição da cobertura VHF/UHF em cenários urbanos com trato particular de transições de morfologia (VHF/UHF urban sites coverage planning with special care to mixed terrain transitions)

Maurício Henrique Costa Dias (mhcdias@ime.eb.br)1, José Carlos Araujo dos Santos (araujo@ime.eb.br)1, Guilherme de Magalhães Ottoni da Silva (gmos1@hotmail.com)2


1Instituto Militar de Engenharia
2Centro Tecnológico do Exército

This paper appears in: Revista IEEE América Latina

Publication Date: June 2011
Volume: 9,   Issue: 3 
ISSN: 1548-0992


Abstract:
This work addresses the main features of a coverage planning algorithm for VHF/UHF low power radio communications systems operating at urban sites, in which special attention was given to mixed terrain clutter transitions. Most of the available commercial prediction tools adopt rough solutions to some problems derived from the use of semi-empirical models with geographical databases. The influence of mixed-path terrains and the path loss due to dense vegetation are typical related examples of usually overlooked aspects. The developed code is based on Hata's semi-empirical approach with additional point-to-point adjusts, and includes specific procedures for those two aspects. It has been developed as Matlab™ routines, which were evaluated comparing its outputs to the ones obtained from the use of a commercial planning tool. Results were coherent with the specific features of the site chosen for the analysis.

Index Terms:
VHF radio propagation, UHF radio propagation, land mobile radio propagation factors, software tools   


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