ANALYSIS OF THE CLASSICAL THEORIES OF PROPAGATION IN THE PRESENCE OF THE EARTH / ANÁLISE DAS TEORIAS CLÁSSICAS DE PROPAGAÇÃO DAS ONDAS RADIOELÉTRICAS EM PRESENÇA DA TERRA

AUTOR(ES)

MAURO SOARES DE ASSIS

DATA DE PUBLICAÇÃO

1966

RESUMO

In view of the mathematical complexity, the rigorous solutions of the classical theories of radio wave propagation in the presence of the earth are not directly applied to practical problems. Hence, based on these rigorous solutions, approximate expressions are developed to simplify the eveluation of radio wave signal attenuation. However, due to assumptions considered in the derivation of such solutions, they have a limited range of validity and, if erroneously used, can lead to unacceptable errors. Nevertheless, this fact does not take out the merit of the approximate solutions, once when they are correctly employed the numerical results are in accordance with the experimental data. This dissertation intends to analyze the approximations usually carried out in radio wave propagation problems, pointing out limitations associated to each particular case. The effect of the ionosphere will not be considered, as well as, the variability of the refractive index of the troposphere responsibe by the scatter propagation mechanism.

ASSUNTO(S)

wave propagation propagacao de ondas

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