Abstract
We show that stationary points of the dispersion characteristics of ionospheric HF radio channels can appear due to the effect of irregularities with scales l∼ 2-5 km and relative variations ΔN/N ∼ 10-3 of electron density. These stationary points can give rise to peaks of the impulse characteristics of wideband HF radio channels. Analytical formulas for estimation of the position, height, and duration of a peak are obtained. We develop and test experimentally methods for determination of the impulse characteristics of ionospheric HF radio channels with various operating frequencies and passbands using chirp-ionosonde signals as well as methods for estimation of the parameters l and ΔN/N of ionospheric irregularities.
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