Journal of Radio Electronics. eISSN 1684-1719. 2025. №2
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2025.2.12
METHOD FOR SIMULTANEOUS MEASUREMENT
OF THE FREQUENCY-AMPLITUDE CHARACTERISTICS
AND THE DOPPLER FREQUENCY SHIFT
OF A MULTIPATH SHORT WAVE RADIO LINE
A.E. Nedopekin 1, A.O. Schiriy 2
1 Mari State Universit, 424000, Yoshkar-Ola, Lenin Square, 1
2 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS 108840
Moscow, Troitsk, Kaluzhskoe shosse, 4
The paper was received November 17, 2024.
Abstract. The paper shows the possibility of increasing the information content of measuring the amplitude-frequency response of a short-wave radio line by measuring the Doppler frequency shift of each mode. A method of such measurement is proposed based on a modified method of oblique sounding of the ionosphere with a linear frequency modulated signal. The technique is as follows: the first preliminary session of oblique sensing is conducted with a high frequency tuning rate (1000-5000 kHz/s) in order to obtain information about delays and amplitudes in a wide frequency range; next, the received ionogram at the receiving point is automatically processed in order to determine the zones of interest, the sensing parameters for subsequent ionograms are determined at a frequency tuning rate of 100-500 kHz/s – the step value between the initial frequencies of linearly frequency modulated pulses; the parameters of the reception session are set; then the sensing scheme for subsequent ionograms is transmitted from the receiving point to the transmitting point using on the Internet or by radio channel; subsequent long-term probing sessions are conducted; The Doppler shift at frequencies is calculated according to the scheme for subsequent ionograms, and the amplitude-frequency response of the radio line according to ionograms from all sensing sessions.
Key words: ionosphere, multipath propagation of short radio waves, Doppler frequency shift, amplitude-frequency response of a radio line.
Corresponding author: Schiriy Andrey Olegovich, andreyschiriy@gmail.com
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For citation:
Nedopekin A.E., Schiriy A.O. Method for simultaneous measurement of the frequency-amplitude characteristics and the Doppler frequency shift of a multipath short wave radio line // Journal of Radio Electronics. – 2025. – №. 2. https://doi.org/10.30898/1684-1719.2025.2.12 (In Russian)