付桂合¹, 马鑫程², 冯成凯¹, 印萍³, 梅赛³, 阳凡林^1,4
1.山东科技大学 测绘科学与工程学院, 山东 青岛 266590;2.中交公路规划设计院有限公司, 北京 100088;3.青岛海洋地质研究所, 山东 青岛 266071;4.自然资源部海岛(礁)测绘技术重点实验室, 山东 青岛 266590

摘要:
为了改善现有的反向散射强度传播损失改正方法在混浊水域适应性较弱的问题，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
FU Gui-he¹, MA Xin-cheng², FENG Cheng-kai¹, YIN Ping³, MEI Sai³, YANG Fan-lin^1,4
1.College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;2.CCCC Highway Consultants CO. Ltd, Beijing 100088, China;3.Qingdao Institute of Marine Geology, Qingdao 266071, China;4.Key Laboratory of Surveying and Mapping Technology on Island and Reef, Ministry of Natural Resources, Qingdao 266590, China
Abstract:
The correction of transmission loss is one of the main factors affecting the image quality of multibeam sonar in the processing of multibeam sonar backscatter data. Due to the large amount of suspended particulate matter in turbid water, existing methods for transmission-loss correction are not suitable for turbid water. In this study, we analyzed the effect of suspended particulate matter on the acoustic propagation loss of multi-beam echoes, and here we propose a model for calculating acoustic transmission loss in turbid water. First, we obtain profiles of the acoustic absorption coefficients using the ocean environment parameters at different depths, then we correct the transmission loss of each beam stratigraphically based on the sound velocity. Experimental analysis shows that the method proposed in this paper realizes the best transmission-loss correction effect, with a Spearman rank correlation coefficient of only 0.04, which is far less than the time varied gain correction of the traditional model. The proposed model 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 systembackscatter strengthtransmission lossturbid waters





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