Estudo da Perda de Propagação através de ambientes de florestas usando um modelo híbrido com Equações Parabólicas

─ ─ ─ This paper proposes a model to calculate the path loss propagation in a mixed environment (forest, streets and buildings) using the parabolic equations method and a random variable, which makes the hybrid model. To solve the parabolic equation the implicit finite differences CrankNicolson scheme was used. The propagation in the paraxial direction in 15° and the complex index of refraction of the medium were considered. In order to validate the proposed model, a campaign of measurements was carried out in two districts of the State of Para, specifically in the city of Marituba in the frequency of 900 MHz and in the city of Barcarena in 1800 MHz. The proposed model was then compared to the experimental data. The error found was 2.28 dB and standard deviation was 3.38 dB. The results show the efficiency of the method.