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 (email@example.com)1, Mauro Soares Assis (firstname.lastname@example.org)2
1Marinha do Brasil2URSI
This paper appears in: Revista IEEE América Latina
Publication Date: Sept. 2015
Volume: 13, Issue: 9
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.
diffraction, terrain smoothness degree, first Fresnel zone radius, convex obstacle, smooth earth
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