Title:
CORRECTION METHOD FOR SOUND VELOCITY IN UNDERWATER POSITION MEASURING SYSTEM
Document Type and Number:
Japanese Patent JP3401374
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method in which a change in a sound velocity can be corrected precisely without measuring a water temperature and a salt density.
SOLUTION: The initial value of a sound velocity (v) and step-size δ are set (Steps 21, 22). Coordinate values x1, x2, y1, y2 of an object point are computed (Step 23). While the step-size δ is being added to the sound velocity (v) (Step 27) until x1=x2 and y1=y2 (Step 24), Step 23 is repeated. When a magnitude relationship is reversed in a previous coordinate value and a recent coordinate value (Step 25), the step-size δ is reduced, and a previous value is used as the value of the sound velocity (v) (Step 26).
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Inventors:
Naoki Sato
Kenichi Koyama
Kenichi Koyama
Application Number:
JP28719195A
Publication Date:
April 28, 2003
Filing Date:
November 06, 1995
Export Citation:
Assignee:
Kaijo Co., Ltd.
International Classes:
G01S5/18; G01S7/526; (IPC1-7): G01S7/526; G01S5/18
Domestic Patent References:
| JP8136321A | ||||
| JP7159532A | ||||
| JP7140241A | ||||
| JP2234090A | ||||
| JP631987A | ||||
| JP62261913A | ||||
| JP6144378A | ||||
| JP6510119A |
Attorney, Agent or Firm:
Nobuyuki Kaneda (2 others)