Marker for subterranean marking and a novel application for such

Details Marker for subterranean marking and a novel application for such Marker for subterranean marking and a novel application for such

1985-07-02

1989-03-07

Sikes, William L.

Communications: radio wave antennas

Antennas

Including magnetic material

343719, H01Q 708

Patent

active

048110302

ABSTRACT:
A geodetic fixpoint system comprising plural terrestrial fixpoints marked by subterranean fixpoint markers with resonance circuits. The markers reveal themselves by a virtual vertical axis searchable by a surface search detector and the fixpoints are found by intersection between the virtual vertical axis and the ground surface. The markers are mounted with spacing sufficient to allow any fixpoint, when marked visually, to be visible from at least one other fixpoint of the system. The surface search detector generates a frequency which is a nominal resonance frequency of the resonance circuits of the markers, and receives the generated frequency from the markers to search for the virtual vertical axis.

REFERENCES:
patent: 3965474 (1976-06-01), Guerrino et al.
patent: 4334227 (1982-06-01), Marks

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