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Fresnel filtering in HF ionospheric reflection channel
Author(s) -
Gherm Vadim E.,
Zernov Nikolay N.
Publication year - 1995
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/94rs01035
Subject(s) - fresnel integral , fresnel equations , reflection (computer programming) , ionosphere , fresnel diffraction , physics , amplitude , ionospheric reflection , fresnel zone , optics , diffraction , computational physics , phase (matter) , spectral line , channel (broadcasting) , geophysics , refractive index , telecommunications , quantum mechanics , computer science , ionospheric heater , programming language
Phase and amplitude fluctuations spectra of the HF point source field in the fluctuating reflection channel are investigated on the basis of Rytov's method generalized to the case of inhomogeneous ionosphere. Integral representations expressing the fluctuation spectra are transformed to a form that is more convenient for numerical estimations owing to the reduced number of integrals. The resulting expressions are evaluated numerically with controlled accuracy for the three‐dimensional power type model of dielectric permittivity fluctuations. The results of calculations show the oscillatory behavior of frequency spectra apparently having Fresnel diffraction origin. The phenomenon is investigated in detail, and results are presented.