Application of small-size antennas for estimation of angles of arrival of HF signals scattered by ionospheric irregularities
| Autor: | A. V. Zalizovski, Qiang Guo, Yu Zheng, Sergiy B. Kashcheyev, V. G. Galushko |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Atmospheric Science Drift velocity 010504 meteorology & atmospheric sciences Backscatter Scattering Aerospace Engineering Astronomy and Astrophysics 01 natural sciences Signal Computational physics Interferometry Depth sounding symbols.namesake Geophysics Physics::Plasma Physics Space and Planetary Science Physics::Space Physics 0103 physical sciences symbols General Earth and Planetary Sciences Ionosphere 010303 astronomy & astrophysics Doppler effect 0105 earth and related environmental sciences |
| Zdroj: | Advances in Space Research. 61:2267-2274 |
| ISSN: | 0273-1177 |
| Popis: | A modification of the Doppler Interferometry Technique is suggested to enable estimating angles of arrival of comparatively broadband HF signals scattered by random irregularities of the ionospheric plasma with the use of small-size weakly directional antennas. The technique is based on the measurements of cross-spectra phases of the probe radiation recorded at least in three spatially separated points. The developed algorithm has been used to investigate the angular and frequency-time characteristics of HF signals propagating at frequencies above the maximum usable one (MUF) for the direct radio path Moscow-Kharkiv. The received signal spectra show presence of three families of spatial components attributed, respectively, to scattering by plasma irregularities near the middle point of the radio path, ground backscatter signals and scattering of the sounding signals by the intense plasma turbulence associated with auroral activations. It has been shown that the regions responsible for the formation of the third family components are located well inside the auroral oval. The drift velocity and direction of the auroral ionosphere plasma have been determined. The obtained estimates are consistent with the classical conception of the ionospheric plasma convection at high latitudes and do not contradict the results of investigations of the auroral ionosphere dynamics using the SuperDARN network. |
| Databáze: | OpenAIRE |
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