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Universal Complex for Sounding and Estimation of Ionospheric Radio Channels Ranging from 3 kHz to 1 MHz Wide

Paper presents the findings of the research carried out with the use of the complex, developed on the basis of SDR, DSA, ML technologies, for active and passive sounding and estimation of HF channels ranging from 3 kHz to 1 MHz wide. Analysis of the sounding data of channels ranging from 3 to 24 kHz wide on a mid-latitude path of length of 2600 km showed that their availability decreases with an increase in the data transfer rate. At a radiation power of 100 W, round-the-clock operation of the communication system was ensured at the maximum data transfer rate of 1200 bps. It was experimentally proved that deconvolution compensates for polarization and intramode dispersion over the transmission bandwidth of up to 1 MHz. This bandwidth would provide an energy gain of up to 35 dB for fast frequency hopping signals. The gain can be spent to increase the channel capacity and reduce the radiated power, opening up new possibilities for HF use by a range of applications.