Journal of Radio Electronics. eISSN 1684-1719. 2024. №4

Full text in Russian (pdf)

DOI: https://doi.org/10.30898/1684-1719.2024.4.1

TWO METHODS FOR MEASURING THE AMPLITUDE-FREQUENCY
CHARACTERISTICS OF MULTIPATH IONOSPHERIC

SHORT-WAVE ADIO CHANNELS BASED ON THE DATA

OF OBLIQUE IONOSPHERIC RADIOSONDING

А.O. Schiriy

Pushkov Institute of Terrestrial Magnetism, Ionosphere
and Radio Wave Propagation RAS
108840, Russia, Moscow, Troitsk, Kaluzhskoe Hwy, 4

The paper was received February 14, 2024.

Abstract. Two methods of measuring the amplitude-frequency characteristics of multipath ionospheric shortwave radio channels with high frequency resolution (tens-hundreds of hertz) are presented. Since traditional narrow-band channels do not allow to separate the various modes of ionospheric propagation of short waves interfering with each other, it is proposed in this paper to use broadband signals, which makes it possible to separate the received modes of ionospheric propagation of a radio signal, as well as to distinguish the signal from interference. The advantage of the first technique is that, together with the amplitude-frequency characteristic of the radio line, as a result, the mode pattern of multipath propagation of short waves becomes known, which allows us to draw qualitative conclusions about the propagation of radio waves, as well as to apply classifications according to empirical multipath models. Disadvantages of the first technique: the manual stage of the selection of mode tracks on the ionograms of oblique sensing, as well as the loss of some information about the energy of the mode tracks due to the diffuseness (blurring) of the traces of mode tracks on the ionogram. The second method, on the contrary, gives only an estimate of the amplitude-frequency characteristics of a multipath shortwave radio line without revealing the mode pattern of multipath, but does it automatically and without losing information about the energy of diffuse tracks. The presentation of both methods in one article allows you to indicate the advantages and disadvantages of each of them, and, accordingly, the preferred areas of application. Since it is important to have a set of techniques with an integrated system approach to the study and measurement of the characteristics of the ionosphere and ionospheric radio channels.

Key words: amplitude-frequency characteristics of multipath radio channels, ionosphere, oblique radiosonding of the ionosphere, ionograms, ionogram processing, multipath propagation of short radio waves, measurement automation.

Corresponding author: Schiriy Andrey Olegovich, andreyschiriy@gmail.com

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For citation:

Schiriy А.O. Two methods for measuring the amplitude-frequency characteristics of multipath ionospheric short-wave radio channels based on the data of oblique ionospheric radiosonding. // Journal of Radio electronics. – 2024. – №. 4. https://doi.org/10.30898/1684-1719.2024.4.1 (In Russian)