An improved positioning model of deep-seafloor datum point at large incidence angle  

作　　者：Qianqian LI Shoulian CAO Fanlin YANG Yu LUO Qian TONG 

机构地区：[1]College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150000,China [2]College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China [3]Key Laboratory of Ocean Geomatics,Ministry of Natural Resources,Qingdao 266590,China

出　　处：《Journal of Oceanology and Limnology》2024年第1期90-100,共11页海洋湖沼学报（英文）

基　　金：the Natural Science Foundation of Shandong Province of China(No.ZR2022MA051);the China Postdoctoral Science Foundation(No.2020M670891);the SDUST Research Fund(No.2019TDJH103)。

摘　　要：The inhomogeneous sound speed in seawater causes refraction of sound waves,and the elimination of the refraction effect is essential to the accuracy of underwater acoustic positioning.The raytracing method is an indispensable tool for effectively handling problems.However,this method has a conflict between localization accuracy and computational quantity.The equivalent sound speed profile(ESSP)method uses a simple sound speed profile(SSP)instead of the actual complex SSP,which can improve positioning precision but with residual error.The residual error is especially non-negligible in deep water and at large beam incidence angles.By analyzing the residual error of the ESSP method through a simulation,an empirical formula of error is presented.The data collected in the sailing circle mode(large incidence angle)of the South China Sea are used for verification.The experiments show that compared to the ESSP method,the improved algorithm has higher positioning precision and is more efficient than the ray-tracing method.

关 键 词：underwater acoustic positioning seafloor datum points large incident angle equivalent sound speed profile(ESSP) deep water 

分 类 号：P733.2[天文地球—物理海洋学]