Loran-based underground geolocation, navigation and communication system
First Claim
Patent Images
1. A method for determining subterranean location, comprising the steps of:
- detecting LORAN signals in the subterranean location, the signals having been transmitted by LORAN transmitting stations; and
,indicating the subterranean location from the detected LORAN signals.
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Abstract
A system is provided for underground mapping, location determination and communications utilizing existing LORAN transmitters and a subterranean H-field antenna coupled to a conventional LORAN receiver. The result is an underground LORAN grid from which mapping and location can be ascertained as well as terrestrial-to-subterranean communications using the LORAN bit streams. Subterranean-to-terrestrial communication is established by a low-frequency handheld transmitter using repeat processing to transmit digital data from the subterranean location to the surface of the earth using modulated H-field waves.
26 Citations
29 Claims
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1. A method for determining subterranean location, comprising the steps of:
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detecting LORAN signals in the subterranean location, the signals having been transmitted by LORAN transmitting stations; and
,indicating the subterranean location from the detected LORAN signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of communicating between the surface of the earth and a subterranean location, comprising the steps of:
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generating a modulated digital signal at a low frequency having informational content; and
,transmitting the modulated signal through the earth. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A method for mapping a subterranean structure, comprising the steps of:
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detecting LORAN signals at subterranean locations; storing the locations; and
,creating a map based on the stored locations. - View Dependent Claims (28, 29)
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Specification