多波束测深表层声速误差的动态影响及改正方法Dynamic influence and correction of inaccurate surface sound speed on multibeam bathymetry data
赵君毅,阳凡林,刘智敏,李真,赵相伟
摘要(Abstract)：
表层声速不准确会对多波束测深波束的归位产生影响,对于平面换能器阵,使波束角产生偏差,从而影响波束最终位置,但Snell常数保持不变;对于曲面换能器阵,虽然波束未束控不产生波束角偏差,但Snell常数发生改变,会使波束在传播过程中出现折射误差,对深水环境测量不利。对于表层声速误差带来的水深误差,外部波束比内部波束受到的影响更严重。当表层声速无法实时准确获取时,根据内外部波束对水深的影响大小识别表层声速误差的存在,通过逐步调整表层声速值,计算波束指向角差值,再重新进行声线跟踪,计算改正后的波束位置,消除其带来的水深的影响,完成表层声速误差的改正。文中用实测数据进行了验证,对多波束测深数据质量的改善有一定的参考意义。
关键词(KeyWords)： 多波束声纳;表层声速;折射;误差
基金项目(Foundation): 国家自然科学基金资助项目:“多波束水深和图像数据精细处理方法研究”(编号:40876051)
作者(Author): 赵君毅,阳凡林,刘智敏,李真,赵相伟
DOI: 10.16251/j.cnki.1009-2307.2010.06.010
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