The results of experiments on the Moscow – Ekaterinburg highway are discussed. The principal possibility of using broadband (150-600 kHz) HF signals for transmitting information and for studying the fine structure of the ionosphere in various heliogeophysical conditions is shown.
Keywords: broadband signal, ionosphere, fine structure, noise resistance, operational forecast, information transfer, multiple-beam structure, separation of signals, base frequencies, signal attenuation, long-term prediction
The article describes optimal mechanisms of wideband transmitter and receiver (150-600 kHz) for information transfer and for researching of thin structure of ionosphere in different helio-geophysical conditions. The proposed schemes give an opportunity to receiving with division of beams and to use the energy of all waves for increasing interference immunity.
Keywords: wideband, frequency of sounding, synchronization, antenna, reference generator, processor, band-pass filter, interference immunity, multipath propagation, phase, program
The article describes the correlation between the signal edge amount of sounding pulse and small irregularities detection in environments with dispersion. The analysis of experimental data on effective bandwidth of decameter waves spreading on the route Moscow-Ekaterinburg and results of wideband ground-penetrating radar sounding in natural environments with high dispersion gives the opportunity to experiment on surface, vertical and backward-inclined sounding. It is reported that the use of wideband electromagnetic pulses is perspective trend of progress in sounding of natural environments.
Keywords: electromagnetic sounding, decameter waves, electromagnetic pulses, small irregularities, permittivity, ground-penetrating radar sounding, dispersion, natural environment, vertical sounding, spectral form, ionosphere