Second-order statistics of radio wave propagation through the structured ionosphere

Details Second-order statistics of radio wave propagation through the structured ionosphere Second-order statistics of radio wave propagation through the structured ionosphere

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..971x&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 11, p. 971-980.

Physics

3

Radio Propagation In Ionosphere, Waves In Random Media, Transionospheric Channel Model, Mutual Coherence Function, Power Spectrum, Scattering Function

Scientific paper

There are several important parameters, such as coherence time, coherence distance and coherence bandwidth, which describe the characteristics of the signal fluctuations and the channel model. These quantities are determined by two-position, two-frequency and two-time mutual coherence function of the received signals after propagating through random media. This paper discusses these second-order statistical quantities by using an analytic solution to the mutual coherence function for plane wave recently obtained by iteration of an integral equation. As an example, the coherence distance is numerically discussed according to signal frequencies and parameters of ionospheric irregularities. It is found that the coherence distance increases with both outer and inner scale, more quickly with the former, while it decreases quickly with increasing of fluctuations of the electron density. Afterwards, the power impulse response, spectra and delay-Doppler scattering function are also derived and discussed with scaled version of illustration. All of these quantities are of importance and necessary to describing a channel model for transionospheric radio propagation through the structured ionosphere.

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