DocumentCode
1239565
Title
Propagation Measurements in the Extremely Low Frequency (ELF) Band
Author
White, David P. ; Willim, Donald K.
Author_Institution
Massachusetts Institute of Technology, Lexington
Volume
22
Issue
4
fYear
1974
fDate
4/1/1974 12:00:00 AM
Firstpage
457
Lastpage
467
Abstract
An experimental measurement program has been conducted to determine propagation parameters in the 40-50 and 70-80 Hz ranges. These measurements have utilized a transmitter in Wisconsin radiating a sinusoidal signal at radiated power levels of 0.5 W at 45 Hz and 1 W at 75 Hz. Sites have been located at Nova Scotia, California, Utah, Hawaii, Norway, Greenland, Greece, and Saipan. Using sites on the same great circle path as the transmitter, it has been possible to estimate average attenuation rates and excitation factors with high accuracy subject to the constraints discussed in the paper. Both daytime and nighttime attenuation rates and excitation factors are discussed.
Keywords
ELF propagation; Attenuation; Bandwidth; Conductivity; Frequency measurement; Geophysical measurement techniques; Ground penetrating radar; Ionosphere; Physics; Radar antennas; Underwater vehicles;
fLanguage
English
Journal_Title
Communications, IEEE Transactions on
Publisher
ieee
ISSN
0090-6778
Type
jour
DOI
10.1109/TCOM.1974.1092221
Filename
1092221
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