GOOGLE PATENTS: Loran-based underground geolocation, navigation and communication system

GOOGLE PATENTS: Loran-based underground geolocation, navigation and communication system

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.

fe patent cell towers loranUS20090146864A1-20090611-D00000

 

2 thoughts on “GOOGLE PATENTS: Loran-based underground geolocation, navigation and communication system

  1. jcmooremain June 5, 2016 at 8:25 pm Reply

    A old time submariner told me that subs even when underwater back in the 70’s and 80’s could communicate with an underground antenna system in the US. We had a communications company together back then and he explained alot of the tech stuff to me. Apparently this US based underground antenna system started in Michigan and went thru a few states if I recall properly. He was the communications man on subs. I’ll have to look him up again.

    Like

  2. jcmooremain June 5, 2016 at 8:29 pm Reply

    Appreciate your website by the way. You might want to look at some of my stuff on my You Tube channel The Flat Earth Survival Guide— https://www.youtube.com/channel/UC7GvPR_azJzke1Ic3zj4E5w/videos.

    Like

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