Recently I created a post in the Drones group that describes locating the Lost Squadron of P-38s and B-17s on Greenland in 1942 and how the locating of the aircraft under hundreds of feet of ice was performed by a Ground Penetrating RADAR drone.
Ground Penetrating RADAR (GPR) is not a new technology :
https://en.wikipedia.org/wiki/Ground-penetrating_radar
It has been used for archeological digs in England
https://historicengland.org.uk/research/methods/terrestrial-remote-sensing/geophysical-survey/
to scanning for hidden tombs in Egypt
https://www.tandfonline.com/doi/full/10.1080/20909977.2020.1746891
to simply locating utility pipes for construction projects
https://www.gp-radar.com/design-build-remodel-construction
as well as for mapping underground mineral caves and mines :
to locating explosives in military operations.
https://www2.l3t.com/cyterra/anpss-14.html
The use of GPR is unrestrictive to any industry or application and is vital for locating objects fast and accurately without unnecessary excavation and risk to human life.
The combination of drones with GPR is something new but I believe that it is a match that uses the best of both technologies. The Greenland Expeditions to locate the Lost Squadron aircraft is a textbook example of the tools on how to search fast, efficiently, uniformly and accurately in locating objects (airplanes) or voids (caves, tombs) or interest.
So when it comes to the big hard jobs of locating something deep underground, the GPR and drones are the best way to accomplish the task.
If there is any questions in regard to designing an antenna for this type of technology, please be sure to respond.
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