| 摘要 |
PROBLEM TO BE SOLVED: To provide a position measuring system capable of acquiring accurately a lateral moving amount and a moving direction in the sea or under the ground in a reclamation work field or in a wide landslide area. SOLUTION: A transmitter 10 having a uniaxial coil 12 for generating an alternating field is buried under the ground or under the sea-bottom ground. In order to receive the alternating field, a detection coil system including the first and second coils CA, CC installed at an interval on the first axis S1 arranged on the ground surface or near the sea surface and the third and fourth coils CB, CD installed at an interval on the second axis S2 orthogonal to the first axis S1 is prepared. A signal processing circuit system includes band-pass filters 16A-16D, differential circuits 17-1, 17-2, and phase detection circuits 18-1, 18-2, processes each detection signal from the first to fourth coils, and determines two-dimensionally a relative position between the axial position of the uniaxial coil and the detection coil system center from a differential signal between each detection signal from the first and second coils and a differential signal between each detection signal from the third and fourth coils. COPYRIGHT: (C)2008,JPO&INPIT
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