Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 113872 10.12737/stp-121202607 cggdit Results of current research Results of current research Results of current research Technique of ionospheric parameters automatic determination from data of vertical sounding with a continuous chirp signal Technique of ionospheric parameters automatic determination from data of vertical sounding with a continuous chirp signal https://orcid.org/0000-0002-1371-6855 Пономарчук Сергей Николаевич Ponomarchuk Sergey Nikolaevich spon@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0002-6472-5006 Грозов Виктор Петрович Grozov Viktor Petrovich grozov@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 25 03 2026 25 03 2026 12 1 50 58 27 06 2025 22 09 2025 https://zh-szf.ru/en/nauka/article/113872/view

We present a technique for determination of ionospheric parameters based on automatic interpretation of vertical sounding (VS) ionograms. Ionograms are interpreted using points with significant amplitude, which were detected after secondary data processing with results of modelling of VS signal height-frequency characteristic (HFC). We have developed algorithms to extract HFC tracks of signals reflected from the E, F1, and F2 layers. These algorithms involve analyzing signal amplitude characteristics and plotting distribution histograms of points falling into the HFC model mask when it is moved over the ionogram. The algorithm to detect tracks of signals reflected from sporadic layers is implemented separately. From the resultant VS HFC, we can estimate ionospheric parameters and calculate the electron density profile.

We present a technique for determination of ionospheric parameters based on automatic interpretation of vertical sounding (VS) ionograms. Ionograms are interpreted using points with significant amplitude, which were detected after secondary data processing with results of modelling of VS signal height-frequency characteristic (HFC). We have developed algorithms to extract HFC tracks of signals reflected from the E, F1, and F2 layers. These algorithms involve analyzing signal amplitude characteristics and plotting distribution histograms of points falling into the HFC model mask when it is moved over the ionogram. The algorithm to detect tracks of signals reflected from sporadic layers is implemented separately. From the resultant VS HFC, we can estimate ionospheric parameters and calculate the electron density profile.

 radio wave propagation ionospheric vertical sounding ionogram electron density profile chirp signal radio wave propagation ionospheric vertical sounding ionogram electron density profile chirp signal The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278) The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (Subsidy No. 075-GZ/Ts3569/278)

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