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A new method for absolute datum transfer in seafloor control network measurement

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Abstract

To decrease the time consumption and the labor intensity in the absolute datum transfer of traditional seafloor control network measurement, a new method, namely sailing-circle positioning method, is put forward in this paper. First, the traditional intersection positioning model is improved by considering the equivalent sound velocity profile error as an unknown parameter in the adjustment model. Second, the effect of geometric dilution of precision (GDOP) on positioning accuracy is analyzed. By seeking for the minimum of GDOP, it is concluded that the absolute datum transfer can achieve the highest accuracy in the condition of sailing along a circle relative to other sailing paths. Moreover, the optimal radius of the circle for the accurate datum transfer is also given out. Besides, the correlation between the accuracy of datum transfer and the sound velocity error in this method is analyzed. Finally, the new method was tested and verified by the experiments in Songhua lake with the water depth of 60 m and in South China sea with the water depth of 2000 m, respectively. These experiment results show that the new method can improve the accuracy and efficiency of traditional datum transfer method significantly.

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Acknowledgments

The research is supported by National Natural Science Foundation of China (Coded by 41576107, 41376109 and 41176068). Guangzhou Marine Geological Survey Bureau (GMGSB) provided enough LBL data and sonar images of an actual project for the research. We are greatly thankful for their selfless support in the research.

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Authors and Affiliations

  1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan, 430079, Hubei, China

    Jianhu Zhao & Yajing Zou

  2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, Hubei, China

    Hongmei Zhang

  3. The First Institute of Oceanography, SOA, Qingdao, 266061, Shandong, China

    Yongting Wu

  4. BGP INC, China National Petroleum Cooperation, Zhuozhou, 072751, Hebei, China

    Shouchuan Fang

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  1. Jianhu Zhao
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  2. Yajing Zou
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  3. Hongmei Zhang
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  4. Yongting Wu
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  5. Shouchuan Fang
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Correspondence to Yajing Zou.

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Zhao, J., Zou, Y., Zhang, H. et al. A new method for absolute datum transfer in seafloor control network measurement. J Mar Sci Technol 21, 216–226 (2016). https://doi.org/10.1007/s00773-015-0344-z

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  • DOI: https://doi.org/10.1007/s00773-015-0344-z

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