| 一种多波束声速剖面反演与海底地形校正技术 |
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| 引用本文： | 马凯,徐卫明,许坚,董洲洋.一种多波束声速剖面反演与海底地形校正技术[J].武汉大学学报(信息科学版),2019,44(4):525. |
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| 作者姓名： | 马凯 徐卫明 许坚 董洲洋 |
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| 作者单位： | 1.海军大连舰艇学院海洋测绘系, 辽宁 大连, 116018 |
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| 基金项目： | 国家自然科学基金61071006 |
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| 摘 要： | 为了解决在多波束测深中声速剖面代表性误差会造成平坦海底地形凹凸变形的问题，提出了一种基于海底观测值的声速剖面反演与海底地形改正技术。该技术利用波束入射角以及单程回波时间信息，建立波束位移与误差声剖的函数关系，采用间接平差与LM（Levenberg-Marquardt）法反演得到与实际声速剖面相近的改正声速剖面，从而达到校正海底畸变地形的目的。海上实验数据验证表明:与含有误差的海上声剖值相比，反演改正后的声剖值更接近海上实际声剖值；水深改正的相对标准差降低50%以上，有效地削弱了畸变海底地形的影响。
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| 关 键 词： | 多波束测深 声速剖面反演 海底地形校正 间接平差 |
| 收稿时间： | 2018-02-23 |
A Method for Inversing Velocity Profiles and Correcting Seafloor Topography Distortion in Multibeam Systems |
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| Affiliation: | 1.Department of Hydrography and Cartography, Dalian Naval Academy, Dalian 116018, China2.Troops 92899, Ningbo 315299, China3.Troops 32023, Dalian 116023, China |
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| Abstract: | To solve the deformed seabed topography caused by the representative error sound velocity profile (SVP) in the flat seafloor during measuring the depth of sea by multibeam systems, a sound velocity profile inversed and seafloor topography corrected method is proposed on the basis of the seabed observation. Looking on the incidence angles and the travel time of beam as the input parameters, the function relationships are built up between the beam displacement and the travel time of the error sound velocity. Then, the modified SVP, which was approximated to the true SVP, is inversed by the indirect adjustment and the Levenberg-Marquardt (LM)method. Thus, correcting the distorted terrain is achieved. Through the field data validating, results show that the inversed SVP is more converged to the original SVP than that of the error SVP. Meanwhile, the distorted terrain caused by the sound velocity errors can be reduced effectively by the proposed inversion method, and the STD (standard deviation) of the modified depth is reduced by 50% above. |
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