The duct model used here is that Kahan and Eckart [1950]. The source of the electromagnetic field is taken to a vertical magnetic dipole in the upper surface layer, with an arbitrary time – varying moment , we can determine the transient behaviour of the electric field strength at any distance above the duct .The paper presents a method which allows the calculation of the atmospheric distortion of radar pulse , provided that the influence of the atmosphere is to transfer the transmitted signal through a duct .the polarization of the primary source whose moment varies arbitrarily in time, is chosen in such a way that it allows the exact determination of the electric field strength at some field point above the duct layer .From the physical point of view. Cahniard s idea is applicable as it is based on evaluating the field in a series of image sources of the primary source . The step – function solution of the problem can then be determined as an infinite integrals over finite integrals.Two cases would be distinguished on the basis of the distance between the receiving and transmitting ends and whether it is greater or lesser than the total reflection distance.

Login Required

Please login to access the full PDF of this article.

🔑 Author Login