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- W1491103498 abstract "We use computer models and experiments to explore the feasibility of communication between points underground and on the Earth's surface. Emphasis is placed on ELF-VLF electromagnetic propagation through the Earth; nominally, we investigated propagation in the 200 Hz-30 kHz frequency range. The computer modeling included calculations of the fields of a point electric or magnetic source in a homogeneous half space or a stratified earth. Initial results for an insulated antenna of finite length are also considered. The experiments involved through-the-Earth transmissions at two locations in Pennsylvania, both of which had large formations of limestone. Initial results indicate that information rates as high as kbits/s may be possible for subsurface depths of 300 m or less. Accuracy of these estimates depends on the electromagnetic propagation constants of the rock, the noise characteristics, and modulation scheme. Although a nuisance for evaluating through-the-Earth propagation, the existence of subsurface metal conductors can improve the transmission character of the site." @default.
- W1491103498 created "2016-06-24" @default.
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- W1491103498 date "1985-06-01" @default.
- W1491103498 modified "2023-09-23" @default.
- W1491103498 title "ELF-VLF communications through-the-earth. Project report for calendar year 1984" @default.
- W1491103498 hasPublicationYear "1985" @default.
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