Coherent multi-frequency multi-track complex for radiophysical monitoring of dynamic processes in the ionosphere
Abstract
The coherent multi-frequency multipath radio diagnostic system for oblique incidence probing the ionosphere was developed and placed in operation in April 2018. The system is capable of continuously monitoring ionospheric dynamical processes resulting from space weather variations, impacts on the ionosphere from high-energy sources of space and terrestrial origin. The possibility of observing the dynamical processes in the ionosphere associated with the partial solar eclipse is demonstrated. The system development is based on the software-defined radio (SDR) technology. The radio system is capable of receiving radio signals in the 10 kHz – 30 MHz range of frequencies. The sophisticated software package has been designed that is capable of delivering highly versatile performance. The number of radio propagation paths and their orientation depend on the specifics of problems being solved. The principle of the system operation is based on measurements of the Doppler shift of frequency and signal amplitude. The implementation of Marple’s algorithm for autoregression spectrum analysis has provided an increase in the Doppler resolution down to 0.02 Hz and in a temporal resolution down to 7.5 s. The data on temporal dependences of the Doppler spectra acquired for various propagation paths were subjected to further analysis of the time series corresponding to different radio wave modes.
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