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http://dx.doi.org/10.12673/jant.2018.22.6.616

Analysis of Frequency of Seismogenic Ionospheric Disturbance by using GNSS Signal  

Kim, Bu-gyeom (School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology, Seoul National University)
Kang, Seon-ho (School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology, Seoul National University)
Han, Deok-hwa (School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology, Seoul National University)
Song, June-sol (Ecole Nationale de l'Aviation Civile (ENAC))
Kee, Chang-don (School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology, Seoul National University)
Publication Information
Journal of Advanced Navigation Technology / v.22, no.6, 2018 , pp. 616-622 More about this Journal
Abstract
Energy which is released by a huge earthquake can reach the ionosphere and induce disturbances. Those disturbances can detected by analyzing the global navigation satellite system (GNSS) satellite's signal. For detecting those disturbances, band-pass filter is generally used. Therefore, it is important to select proper pass band that can contain disturbance's frequency. In this paper, we analyzed a frequency of the ionospheric disturbances which are induced by earthquake by using GNSS signal. For analyzing seismogenic ionospheric disturbances, we calculated a geometry free combination of carrier phase to obtain a ionospheric delay. After that, the fast Fourier transform was applied to the 1 mHz high-passed ionospheric delay. As a result of analyzing disturbances, the frequency band of earlier disturbances was 4.5 mHz~11mHz and the representative frequency was 5.7 mHz. The frequency band of subsequent disturbances was 6 mHz~10 mHz and the representative frequency was 7.3 mHz.
Keywords
Ionospheric disturbances; Frequency; High-pass filter; Fast Fourier transform;
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