G - Physics – 01 – S
Patent
G - Physics
01
S
343/33, 351/58,
G01S 13/04 (2006.01) G01S 7/02 (2006.01) G01V 3/12 (2006.01) G01S 13/88 (2006.01)
Patent
CA 1244919
A B S T R A C T A method and antenna assembly for transmitting into the ground polarisable radiation for use therewith in which buried objects, and particularly long thin objects such as pipes can be located, the position determined, and the pipe direction ascertained, by taking measurements from a single point, without mechanical movement of the antenna, and thereby allowing for good suppression of spurious signals and a reduction in false indications. The method includes the steps of transmitting into the ground polarisable radiation, receiving reflected signals, indicative of said objects, incident upon at least two co-located angularly disposed transducers and comparing the signals thus received, said radiation being transmitted from a transducer source which is co-located but angularly disposed with respect to each receiver transducer. An antenna assembly suitable for use in the method of the invention comprises a substantially planar arrangement of at least three, co-located, two-terminal antennas wherein the antennas are angularly disposed with respect to each other around a common point and each antenna is adapted to be capable of selectively transmitting polarisable radiation into the ground and receiving reflected radiation from out of the ground.
493053
British Gas Corporation
Gowling Lafleur Henderson Llp
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