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Researches on Mechanism of SLF and ELF Wave Propagation in an Anisotropic Earth-Ionosphere Cavity

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Tutor: LiKai
School: Zhejiang University
Course: Electromagnetic Field and Microwave Technology
Keywords: SLF ~ ELF,Anisotropic,Earth - ionosphere,Horizontal electric dipole,Reciprocity
CLC: TN011.2
Type: Master's thesis
Year:  2012
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Abstract:
In recent years, due to the shallow seismic , geological strata probing , in-depth study of its submarine navigation and communication technology , the need to learn more about the ultra-low frequency band of radio wave propagation characteristics of extremely low frequency (SLF-ELF) ELF band depth learning , in-depth study of very low frequency radio wave propagation characteristics have significant meaning . This article discussed the extremely low frequency electromagnetic waves corresponding communication theory . Briefly retell the work of their predecessors , given a vertical electric dipole in the earth and ionosphere are ideal isotropic , vertical magnetic dipole and horizontal electric dipole generated electromagnetic field expression derivation . Ultra-low frequency band of extremely low frequency (SLF-ELF) electromagnetic wave frequency is very low , under the influence of Earth's magnetic field , ionosphere the SLF-ELF wave will reflect the anisotropic characteristics . Article further theoretical analysis of the anisotropic characteristics of the ionosphere on the reflective properties of the ionosphere under the influence of the Earth's magnetic field and the impedance matrix . The innovation of this paper is that the original ground - isotropic ionosphere waveguide model improvements for the land affected by the Earth's magnetic field - anisotropic ionosphere model . Analytic expression derived in this non-ideal conditions of a vertical magnetic dipole component , and a similar approach is derived vertical electric dipole expression , reuse reciprocity theorem to derive a practical application more more horizontal electric dipole component of the expression . Finally , write a program simulation gives the example under typical conditions .
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