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Investigation of diffraction pattern occurring at earth's surface for back scattering of radio waves by inhomogeneities in the lower ionosphere

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Conclusions

The space scale of the diffraction pattern is determined by the joint influence of the antenna-system radiation pattern and the radio wave-scattering angular spectrum. Judging from our results, the radio wave scattering spectrum for the upper part of the D-region of the ionosphere at 5.75 MHz is basically concentrated in theI > 20° range of angles. The diffraction pattern is relatively independent of the antenna system if the dimensions of its radiation pattern exceed 20°. If more directional antennas are used, the space correlation radius will increase. This is important for more reliable measurements of the velocity on the inhomogeneities. The experiments performed show that in the first approximation the assumption that inhomogenity motion is “frozen-in” is justified. Utilization of transmitting antennas with different radiation patterns and a system of spatially diverse antennas yields information on the radio waves scattering angle spectrum and makes it possible to determine the wind profile in the lower ionosphere.

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Authors
  1. E. A. Benediktov
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  2. L. V. Grishkevich
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  3. V. A. Ivanov
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  4. Yu. A. Ignat'ev
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Additional information

Scientific-Research Institute of Radiophysics. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 17, No. 6, pp. 798–807, June, 1974.

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Benediktov, E.A., Grishkevich, L.V., Ivanov, V.A. et al. Investigation of diffraction pattern occurring at earth's surface for back scattering of radio waves by inhomogeneities in the lower ionosphere. Radiophys Quantum Electron 17, 606–612 (1974). https://doi.org/10.1007/BF01038648

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  • DOI: https://doi.org/10.1007/BF01038648

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