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混浊水域多波束反向散射强度传播损失改正
付桂合1, 马鑫程2, 冯成凯1, 印萍3, 梅赛3, 阳凡林1
1.山东科技大学;2.中交公路规划设计院有限公司;3.青岛海洋地质研究所
摘要:
多波束反向散射强度处理过程中,传播损失改正是影响多波束声呐图像质量的主要因素之一。由于混浊海水中含有大量的悬浮颗粒物,现有传播损失改正方法在混浊水域下适应性较弱,为此,本文分析了悬浮颗粒物对多波束回波声传播损失的影响,提出了混浊水域声传播损失计算模型。首先利用不同深度的海洋环境参数构建声波吸收系数剖面,然后基于声速,沿波束传播路径,对每个波束分层计算传播损失。实验分析表明,本文方法传播损失改正效果最佳,其Spearman等级相关系数绝对值仅为0.04,远小于传统模型和TVG改正,大大减弱了混浊水域情况下多波束回波强度与传播距离的相关性,有效改善了多波束声呐图像的质量。
关键词:  多波束声呐系统  反向散射强度  传播损失  混浊海水
DOI:10.11759/hykx20190424002
分类号:P229
基金项目:国家重点研发计划项目(2018YFF0212203,2018YFC1405900,2016YFC1401210);国家自然科学基金项目(41930535,41830540)
Transmission loss correction of multibeam sonar backscatter strength in turbid waters
FUGUIHE1, MAXINCHENG2, FENGCHENGKAI1, YINPING3, MEISAI3, YANGFANLIN1
1.Shandong University of Science and Technology;2.CCCC Highway Consultants CO. ,Ltd.;3.Qingdao Institute of marine geology, China Geological Survey
Abstract:
Transmission loss correction is one of the main factors affecting the image quality of multi-beam sonar in the process of multibeam sonar backscatter data processing. Due to the large amount of suspended particulate matter in turbid water, the existing methods of transmission loss correction are not suitable for turbid water. Therefore, the effect of suspended particulate matter on acoustic propagation loss of multi-beam echoes is analyzed, and a calculation model of acoustic transmission loss in turbid water is proposed. Firstly, the acoustic absorption coefficient profiles are constructed by using the ocean environment parameters at different depths, and then the transmission loss of each beam is corrected stratifiedly based on the sound velocity. Experimental analysis shows that the method in this paper has the best transmission loss correction effect, with the Spearman rank correlation coefficient being only 0.04, far less than the traditional model and TVG correction, which greatly weakens the correlation between multi-beam echo intensity and transmission distance in cloudy waters and effectively improves the quality of multi-beam sonar images.
Key words:  Multibeam system  Backscatter strength  Transmission loss  turbid waters
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