Lightning detection Lightning detection and localization using and localization using extended Kalman filter extended Kalman filter Ines Ben Saïd Ines Ben Saïd U2S(ENIT) U2S(ENIT) SYS’COM Master SYS’COM Master 2008-2009 2008-2009 National Engeneering School of Tunis
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Lightning detection and localization using extended Kalman filter
National Engeneering School of Tunis. Lightning detection and localization using extended Kalman filter. Ines Ben Saïd U2S(ENIT) SYS’COM Master 2008-2009. U2S. References. - PowerPoint PPT Presentation
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Lightning detection Lightning detection and localization using extended and localization using extended
Kalman filterKalman filter
Ines Ben SaïdInes Ben SaïdU2S(ENIT) U2S(ENIT)
SYS’COM Master SYS’COM Master 2008-20092008-2009
National Engeneering School of Tunis
22
ReferencesReferences
1 - 1 - T. G. Wood, Geo-location of individual lightning discharges using impul-
sive vlf electromagnetic waveforms, Phd thesis, The department of electrical
engineering and the committee on graduate studies of stanford university, De-
cember 2004.
2 - 2 - S. A. Cummer, Lightning and ionospheric remote sensing using vlf/elf radio
atmospherics, Phd thesis, The department of electrical engineering and the
committee on graduate studies of stanford university, August 1997.
3 - 3 - R. E. Kalman, A new approach to linear filtering and prediction problems,
Transaction of the ASME Journal of Basic Engineering, (pp. 35{45), March
radio atmospherics (‘sferic’) = Waves that propagates in the ELF/VLF band with low attenuation (~3dB/1000Km)
Lightning detection via VLF data analyses
Receivers
Transmitters
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VLF receiver at LSAMAVLF receiver at LSAMA
Hardware Software
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VLF receiver schemaVLF receiver schema
Two data types: - narrow band
- broad band
A/D
Converter
66
Broad band signalsBroad band signals
transmitters
sferic
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Sferic caracteristicsSferic caracteristics
Much of the sferic energy lies in [5KHz-15KHz] band (Much of the sferic energy lies in [5KHz-15KHz] band (Cummer 2004 Cummer 2004 )) Duration ~4ms: - ~ 1ms VLF impulseDuration ~4ms: - ~ 1ms VLF impulse - ~ 3ms ELF slow tail- ~ 3ms ELF slow tail
(Cummer 2004 )(Cummer 2004 )
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Sferics detection methodSferics detection method
Identification Two successif instants must be separated with an delay >= 4ms (sferic duration) Determinate the simultaneous instants for the N/S and E/W signals.