Um Modelo Híbrido de Previsão para Propagação sobre Relevo Irregularnas bandas VHF e UHF (A Hybrid Prediction Model for Propagation over Irregular Terrain in the VHF and UHF Bands)

André Vinícius Pinho Luiz (, Mauro Soares Assis (

1Marinha do Brasil

This paper appears in: Revista IEEE América Latina

Publication Date: Sept. 2015
Volume: 13,   Issue: 9 
ISSN: 1548-0992

This paper proposes a hybrid model for the calculation of diffraction by terrain irregularities in the VHF and UHF bands. The model is based on the theories of diffraction by multiple obstacles and over a smooth spherical earth. It includes also an interpolation procedure to solve the problem in the transition between these two solutions. A MATLAB tool was employed for testing the proposed hybrid model by comparison with 8934 measurements available in the ITU-R (Radiocommunication Sector of ITU) data bank. It has shown a RMS error at least 3 dB smaller than other models developed for the same purpose.

Index Terms:
diffraction, terrain smoothness degree, first Fresnel zone radius, convex obstacle, smooth earth   

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