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中文摘要：
传统声线跟踪方法中波束初始入射角的计算采用理想状态下多波束提供的波束分配角,未顾及或未完全顾及船体姿态角的影响进而导致波束海底投射点归位计算带入显著性误差问题。针对此问提出了一种顾及姿态角影响的声线精确跟踪方法,该方法通过研究船体姿态影响下的多波束换能器状态,给出了波束声线实际传播面,并推导出了传播面内波束声线的实际初始入射角,结合声速剖面,最终根据常梯度声线跟踪得到了准确的测深点三维坐标。通过实验比较传统声线跟踪方法和精确声线跟踪方法计算波束在海底投射点的坐标精度,验证了精确声线跟踪方法克服了传统声线跟踪的不足,显著地提高了多波束测深的精度。
英文摘要：
The assigned beam initial incident angle provided by MBS（ multibeam bathymetry system） is adopted by the traditional sound ray tracking method regarding the vessel in the horizontal status,which ignores or does not consider completely the impacts of vessel attitude angles,and lead obvious error to the determination of beam footprint position.Aiming at the problem. In order to reduce this kind of significant error,an accurate method for sound ray tracking,which considers vessel attitude angles are put forward in this paper. In the proposed method,the actual propagation profile is given by means of studying the actual status of MBS transducer impacted by vessel attitude and the actual initial incidence angle of MBS beam is derived by the calculation model. By integrating the sound velocity profile,the accurate positioning of beam footprint on seabed is achieved by constant-gradient sound ray tracking method. By comparing the beam footprint coordinate precision calculated by traditional sound ray tracking method and the precise method of sound ray tracking in experiment,a conclusion can be drawn that the precise method of sound ray tracking can overcome the deficiency of the traditional sound ray tracking. This improves significantly the precision for multi-beam bathymetry
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