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The paper analyses the outcomes of numerical studies into the effect of phase dispersion on broadband elements of a FMCW signal with varying central spectrum frequencies corresponding to the central frequencies of radio channels. We used the International Reference Ionosphere (IRI) model as the background ionosphere, which takes into account the spatiotemporal variability of the radio channel. The...
The problem of forming an FMICW signal for vertical-incidence single-antenna ionosonde based on the USRP platform using SDR technology was solved. We carried out studies aimed at getting a constant level of a received signal, unambiguous determining virtual reflection height in the required range as well as reducing interference and correlation noise during transmission and compression. The developed...
This work presents the method of dividing maximum observed frequencies (MOF) daily variances (DV) into regular and remaining components. The MOF DV remaining component (or the remaining component) is found to have random characteristics. Analyzing the standard deviation (delta) daily variance of remaining component (the delta-daily variance) in relationship with geomagnetic activity level simultaneously...
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