An improved algorithm based on equivalent sound velocity profile method at large incident angle  

作　　者：Qianqian Li Qian Tong Fanlin Yang Qi Li Zhihao Juan Yu Luo 

机构地区：[1]College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China [2]College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Acta Oceanologica Sinica》2024年第2期161-167,共7页海洋学报（英文版）

基　　金：The Natural Science Foundation of Shandong Province of China under contract Nos ZR2022MA051 and ZR2020MA090;the National Natural Science Foundation of China under contract No.U22A2012;China Postdoctoral Science Foundation under contract No.2020M670891;the SDUST Research Fund under contract No.2019TDJH103;the Talent Introduction Plan for Youth Innovation Team in universities of Shandong Province(innovation team of satellite positioning and navigation)。

摘　　要：With the development of ultra-wide coverage technology,multibeam echo-sounder(MBES)system has put forward higher requirements for localization accuracy and computational efficiency of ray tracing method.The classical equivalent sound speed profile(ESSP)method replaces the measured sound velocity profile(SVP)with a simple constant gradient SVP,reducing the computational workload of beam positioning.However,in deep-sea environment,the depth measurement error of this method rapidly increases from the central beam to the edge beam.By analyzing the positioning error of the ESSP method at edge beam,it is discovered that the positioning error increases monotonically with the incident angle,and the relationship between them could be expressed by polynomial function.Therefore,an error correction algorithm based on polynomial fitting is obtained.The simulation experiment conducted on an inclined seafloor shows that the proposed algorithm exhibits comparable efficiency to the original ESSP method,while significantly improving bathymetry accuracy by nearly eight times in the edge beam.

关 键 词：equivalent sound speed profile ray tracing method large incident angle edge beam deep sea error correction multibeam echo-sounder system 

分 类 号：P229[天文地球—大地测量学与测量工程] P714[天文地球—测绘科学与技术]