Patent ID: 11964745
Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 1:
2. An underwater work system comprising:
a surface ship located on water;
an underwater vehicle that performs searching work of finding a pipeline laid on a bottom of the water;
a wave transmitter that is mounted on the surface ship and transmits a sound wave used to measure a relative position of the underwater vehicle relative to the surface ship; and
circuity configured to
acquire the relative position of the underwater vehicle relative to the surface ship at the start of the searching work, the relative position being measured based on the sound wave transmitted from the wave transmitter,
calculate a position of the underwater vehicle based on the acquired relative position, and
when an interval between a measurement error region whose center corresponds to the calculated position of the underwater vehicle and an expected laid region of the pipeline extending in a predetermined direction is not a predetermined distance, move the underwater vehicle to such a position that the interval between the measurement error region and the expected laid region becomes the predetermined distance, and then, make the underwater vehicle perform crossing detection in which the underwater vehicle detects the presence or absence of the pipeline while crossing the expected laid region.