Irkutsk, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Russian Federation
Irkutsk, Irkutsk region, Russian Federation
UDK 537.87 Распространение и излучение электромагнитных волн
We present a modified method of HF radio channel modeling based on a waveguide approach. The waveguide approach represents the electromagnetic field of radiation inside the Earth—ionosphere waveguide as an eigenfunction series of a radial boundary problem with impedance conditions on the Earth surface and radiation conditions at infinity. The transfer function of the radio channel is represented as a series of products of angular-operator Green functions, excitation coefficients, and coefficients for receiving individual normal modes. We have obtained a solution of the boundary value problem of determining the eigenfunctions and eigenvalues of the radial operator. The solution can be applied to the frequency range below the ionospheric F-layer critical frequency. We examine algorithms for calculating distance-frequency, frequency-angular, and amplitude characteristics of signals by analyzing and numerically summarizing the series in terms of strongly damped normal modes.
radio wave propagation, radio channel, waveguide approach, simulation, ionosphere sounding
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