D.V. Ivanov1, V.A. Ivanov2, N.V. Ryabova3, A.A. Elsukov4, N.A. Konkin5

1-5 Volga State University of Technology (Yoshkar-Ola, Russia)

The problem of ionospheric radio communication is the variability of the operating frequency range and radio channel parameters in geophysical time. Therefore, the task of creating active radio sensors to improve ionospheric tactical communication is topical. The challenge is to create a sensor that performs diagnosing for a minimum time, has a minimum power, and provides an opportunity to increase the number of data users through the remote control of its terminals and data processing. Purpose: the development of methods, their algorithms and software tools for creating an active sensor operating in the mode of simultaneous-sequential sounding of ionospheric channels by spread spectrum signals with the possibility of organizing remote interaction with users. Results: We developed methods for digital synthesis and processing of multi-carrier OFDM signals with spectrum spreading of partials by BPSK, taking into account the features of the discrete Fourier transform. In addition to this, we proposed a system for remote control of the sensor and a method for analyzing the parameters of HF radio channels, which allow one to plan the diagnosing process and remotely obtain real-time data on the main parameters of the diagnosed communication links. The paper presents the findings of experimental verification of the developed approaches for the case of operation of a tactical HF communication system on NVIS links. The study proved their reliability and the advantages of the sensor of ionospheric radio channels. Practical relevance: The use of active sensors in advanced cognitive HF communication systems contributes to the solution of the current main problems of ensuring a more uniform use of partial channels, increasing communication noise immunity, modem performance, reducing radiated power and enhancing opportunities for communication users.

Ivanov D.V., Ivanov V.A., Ryabova N.V., Elsukov A.A., Konkin N.A. Active sensor with remote control for diagnostics of broadband ionospheric radio channels with OFDM-BPSK-signals. Radiotekhnika. 2022. V. 86. № 12. P. 90−104. DOI: https://doi.org/10.18127/ j00338486-202212-08 (In Russian)

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