Propagação de Sinal de TV Digital Terrestre em Ambiente Urbano: Análise da Cobertura em Araguari, MG

Abstract

This study investigates the propagation of terrestrial digital TV (TDT) signals in the city of Araguari, Minas Gerais, using propagation prediction models. The aim is to evaluate the accuracy of these models and compare them with actual field intensity data collected on-site. Three models were analyzed: Log-Distance, Okumura-Hata, and ITU-R P.1546-6. The Log-Distance model proved useful for quick estimates in areas with little obstruction but was less accurate in urban areas. The Okumura-Hata model showed greater accuracy in areas with high building density but had limitations concerning terrain topography. The ITU-R P.1546-6 model achieved the best overall performance, demonstrating greater accuracy in complex urban environments, though it required more complex calculations and detailed data. This study highlights the complexity of signal propagation in urban environments and the need to calibrate models with field data to increase prediction accuracy. The results underscore the importance of a conservative approach in communication network planning, using safety margins to ensure service quality.