Ground global tomography (CGT) using modulation of the ionospher

Details Ground global tomography (CGT) using modulation of the ionospher Ground global tomography (CGT) using modulation of the ionospher

1995-12-08

1998-07-07

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324335, 324344, 324345, G01V 308, G01V 312

Patent

active

057774765

ABSTRACT:
An apparatus and method for performing geological mapping utilizes an HF transmitter to heat ionospheric electrons to cause the current in an overhead electrojet to be modulated, thereby injected a low frequency EM signal into the Earth-ionosphere waveguide. A sensor measures vector values of electric and magnetic fields in an area to be surveyed. The measured vector values are provided to a processor that creates a conductivity map of the surveyed area based on the measured vector values.

REFERENCES:
patent: 3594633 (1971-07-01), Barringer
patent: 5148110 (1992-09-01), Helms
patent: 5260660 (1993-11-01), Stolarczyk

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