不均一大気中における見通し内電波伝搬の問題の一解法

概要

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The problem of tropospheric radio wave propagation within the horizon has so far been discussed theoretically. The conventional method gives sufficiently high acuracy to the calculation of field strength in the atmosphere in which the refractive index varies linearly with the altitude. It is, however, unsuitable for the case of propagation in an atmosphere whose refractive index varies arbitraryly along the altitude. In this paper, a wave theoretical method which can treat radio wave propagation within the horizon in an inhomogeneous atmosphere which has arbitrary distribution profile of refractive index is presented. In view of the extension of the analysis to the case of an arbitrary index profile as well as the use of a digital computer, an arbitrary profile is approximated by a polynomial with the altitude, and solutions of the wave equation are approximated to the form suitable to the application of the method of steepest descent. A numerical method for finding saddle points is given. Results of numerical calculation of linear profile of refractive index agrees with those of the conventional theory and show that the present method has a considerable applicability if the distance between the transmitting and the receiving points is not too large.
明治大学の論文