| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein the position of an object, such as measuring equipment or the like which is installed on a seabed of very deep sea having the depth of ten thousand meters or the like, cannot be measured, because of the errors arising from the differences in water temperatures and concentrations of salt. SOLUTION: In a method for measuring the position of the object installed on the seabed, when the object is thrown into the sea from a mother ship floating on the sea in order to install it on the seabed, the moving trajectory of the object is calculated by using a signal from the object and GPS information, and then stored. A moving trajectory, a portion of which cannot be calculated, is compared with the known moving trajectory, thereby deducing a perfect trajectory. When the object installed on the seabed is brought to surface, the moving trajectory of the object is calculated by using the signal from the object and the GPS information and is then stored. The moving trajectory, a portion of which cannot be calculated, is compared with the known moving trajectory, thereby deducing the perfect trajectory. A circular hypothetical line, at which the object is located on the seabed, is obtained from a coordinate position of the mother ship floating on the sea, a distance from the object located on the seabed to the mother ship and the depth of corresponding seabed. Then, similar hypothetical lines are obtained by changing the position of the mother ship on the sea, and an intersection point of at least three hypothetical lines is obtained as the true object position. COPYRIGHT: (C)2005,JPO&NCIPI
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