Dual antenna radio frequency locating apparatus and method

Details Dual antenna radio frequency locating apparatus and method Dual antenna radio frequency locating apparatus and method

1992-10-08

1994-06-14

Bagnell, David J.

Boring or penetrating the earth

Automatic control

Of boring means including a below-ground drive prime mover

175 45, 33304, 324329, E21B 47022, E21B 4709

Patent

active

053201809

ABSTRACT:
The present method and apparatus are directed to river crossings and the like. A horizontal drilling rig is set up and drills under a body of water or the like. Angular measurement sensors carried at the drill bit provide data periodically which is transmitted from a transmitter at the end of the drill string. Two antennas are deployed, the two being parallel strips spaced equally on the left and right of the right of way. They connect with two receivers. The transmitted angular data is used to determine the location of the drill bit. Progressive determinations of the transmitter enable determination of the trajectory during drilling. The two antennas are used to provide redundant reception of the transmitted signal. In addition to that, a quick reading of lateral drift is obtained by measuring the ratio of the received signals. The two antennas have the form of flat strips which can be deployed across the terrain, over a river, and the like.

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