A comparison of different source location methods for ELF transients by using the parent lightning discharges with known positions
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概要
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Different kinds of direction finding methods have been proposed so far in order to locate ELF transients. As for the azimuth determination, we have used the Lissajous method and goniometer and Poynting vector methods. The range (or source-to-observer distance) estimation, based on the use of wave impedance, by using the known positions of parent lightning discharges during the European sprite campaign. In this case, we have compared different methods ((1) cross-correlation over a wide frequency range between the measured and theoretical wave impedances, (2) the use of peak frequency in the observed wave impedance, (3) Jones and Kemp method (the use of maxima and minima in the frequency spectrum of wave impedance), (4) the use of oscillation frequency in the wave impedance variation). As a result we found that the Jones and Kemp method has produced the best results with an error of 0.33 Mm for the nine events with sufficient S/N ratio from the analyzed 11 events. This has been based on the FFT analysis. However, for the remaining two events with small time separation, we have tried the use of wavelet analysis, which improved the range determination significantly. Finally, we recommend a combined use of Jones and Kemp method and wavelet analysis for locating ELF transients.
- 2011-06-09
著者
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Hobara Yasuhide
Department Of Automatic Control And Systems Engineering University Of Sheffield
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Hayakawa Masashi
Department Of Electronic Engineering The University Of Electro-communications
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Hayakawa Masashi
Department Of Electronic Engineering University Of Electro-communications
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Nakamura Takashi
Department Of Cardiology Saiseikai Shiga Hospital
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Hobara Yasuhide
Department Of Electronic Engineering University Of Electro-communications
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Hayakawa Masashi
Department Of Electronic Engineering And Research Station On Seismo Electromagnetics The University Of Electro-communications
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