Dependency on the sound velocity model for the GPS-acoustic seafloor positioning.
In order to detect the dependency on the sound velocity model for the GPS-acoustic seafloor positioning with the transponder-array constraint method, I reanalyze the data with following sound velocity models : (1) using more realistic vertical profile in which the sound velocity is time-independent for the depth of more than 1200 m instead of the usual model in which the depth-independent temporal variation is estimated, and (2) using statistical values for initial sound velocity for the depth of more than 1200 m instead of the observed values. The results quantitatively revealed that both models cause no significant difference in the relative position within the observation accuracy. The vertical component of the absolute position, however, systematically depends on the sound velocity structure model. Furthermore, I found the non-linear dependence of the absolute position on the initial sound velocity as well.
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
2016
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| Online Access: | http://hdl.handle.net/1834/15523 |
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| Summary: | In order to detect the dependency on the sound velocity model for the GPS-acoustic seafloor positioning with the transponder-array constraint method, I reanalyze the data with following sound velocity models : (1) using more realistic vertical profile in which the sound velocity is time-independent for the depth of more than 1200 m instead of the usual model in which the depth-independent temporal variation is estimated, and (2) using statistical values for initial sound velocity for the depth of more than 1200 m instead of the observed values. The results quantitatively revealed that both models cause no significant difference in the relative position within the observation accuracy. The vertical component of the absolute position, however, systematically depends on the sound velocity structure model. Furthermore, I found the non-linear dependence of the absolute position on the initial sound
velocity as well. |
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