浅水多波束勘测数据精细处理方法

The Methods of High Quality Post-Processing for Shallow Multibeam Data

系统分析多波束勘测水深的误差表现,针对性地提出相应的改正措施,首先去掉勘测质量差的重复覆盖条带,改正横摇校准残差,然后根据提出的浅水常梯度声速模型,搜索确定模型参数,以此模型参数及波束到达角和旅行时对每个波束重新进行归位计算,接着自动删除多余边缘波束,最后网格化水深数据并以对应的波束号确定中央和边缘波束位置,对格网中边缘波束进行强制微调,得到光滑的格网水深数据。从实测数据结果来看,本文算法物理意义明确、切实可行、后处理速度较快,改正结果较理想。

In this paper, we analyzed the errors in muhibearn bathymetry in detail. According to different sources, we use corresponding algorithms to correct depth errors. Firstly. the low quality swaths and outliers are removed, Then a reduced and equivalent sound speed profile modcl is presented. The model parameters can be searched under the principles of the minimum difference betwcen the overlap sites of two neighhoring swaths. Then the horizontal position and depth of each beam can be recalculated through the model parameters. And then the redundant edge beams are automatically delctcted. Finally, the grid depths are finely adjusted according to the differences of neighboring edge beam and are processed by a low-pass fihcr. Wewill get a smooth seafloor terrain image after these procedures are finished. Thc method is verified by the real data.