2026-09-19T21:32:27Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/169732022-01-13T07:54:29Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Earle R. Williams.
Lowenfels, David F., 1979-
Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2005-05-19T15:30:03Z
2005-05-19T15:30:03Z
2002
2002
http://hdl.handle.net/1721.1/16973
53712465
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
Includes bibliographical references (p. 70-72).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
A new vertical electric field antenna has been installed at our West Greenwich, RI Schumann resonance field station, coupled to a high-bandwidth charge amp and a computerized sampling system. Techniques are given for the processing of lightning transients. Digital signal processing techniques for the removal of power line harmonic noise are presented and evaluated. Additionally, a wideband (3 Hz - 24 kHz) simulation model has been developed. This model gives evidence that slow tail waveforms are generated primarily due to the variation of waveguide phase velocity with frequency and the depletion of spectral energy in the waveguide cutoff region. Preliminary formulas for distance estimation have been developed from the simulations, based on slow tail separation time and spectral ratios. These methods are evaluated for consistency against real events.
by David F. Lowenfels.
M.Eng.
155 p.
5177182 bytes
5176694 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Wideband processing and analysis of lightning in the earth-ionosphere waveguide
Wideband signal processing and analysis of lightning in the earth-ionosphere waveguide
Thesis
application/pdf
false
Publication
unknown
unknown
<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="79df02ba-79a7-44b6-b03f-1c5f72d07a9a">
<Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type>
<Language>eng</Language>
<Title>Wideband processing and analysis of lightning in the earth-ionosphere waveguide</Title>
<Subtitle>Wideband signal processing and analysis of lightning in the earth-ionosphere waveguide</Subtitle>
<PublishedIn>
<Publication>
</Publication>
</PublishedIn>
<PublicationDate>2002</PublicationDate>
<Authors>
<Author>
<DisplayName>Lowenfels, David F., 1979-</DisplayName>
<Affiliation>
<OrgUnit>
</OrgUnit>
</Affiliation>
</Author>
</Authors>
<Editors>
</Editors>
<Publishers>
<Publisher>
<DisplayName>Massachusetts Institute of Technology</DisplayName>
<OrgUnit />
</Publisher>
</Publishers>
<License>http://dspace.mit.edu/handle/1721.1/7582</License>
<Keyword>Electrical Engineering and Computer Science.</Keyword>
<Abstract>A new vertical electric field antenna has been installed at our West Greenwich, RI Schumann resonance field station, coupled to a high-bandwidth charge amp and a computerized sampling system. Techniques are given for the processing of lightning transients. Digital signal processing techniques for the removal of power line harmonic noise are presented and evaluated. Additionally, a wideband (3 Hz - 24 kHz) simulation model has been developed. This model gives evidence that slow tail waveforms are generated primarily due to the variation of waveguide phase velocity with frequency and the depletion of spectral energy in the waveguide cutoff region. Preliminary formulas for distance estimation have been developed from the simulations, based on slow tail separation time and spectral ratios. These methods are evaluated for consistency against real events.</Abstract>
<Access xmlns="http://purl.org/coar/access_right"
>
</Access>
</Publication>