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Numerical simulation was enforced for the purpose of precision inspection of large-scale underwater structures installation system. Observation values by compound measurement system that used GPS and SONAR areadjusted by observation equations with constraints. Numerical simulation used observation values formed by BoxMuler method, and enforced comparison with adjustment results by the above-mentioned method.SONAR system cannot ignore sound speed changes that originate in water temperature changes in the real sea. Using the theory value of sound speed distribution that was supposed to typical water temperature day change, the precision of revision method was inspected. As a result, satisfactory performance for vertical distribution and day change of sound speed was confirmed.

INSTALLATION SYSTEM OF LARGE-SCALE UNDERWATER STRUCTURES BY COMPOUND MEASUREMENT METHOD USED GPS AND SONAR