一种基于等效声速迭代计算的深度测量误差修正模型  

A bathymetry error correction model based on iterative calculation of equivalent sound velocity

作　　者：童倩 李倩倩[1,2] 罗宇 彭东东 朱金龙 TONG Qian;LI Qianqian;LUO Yu;PENG Dongdong;ZHU Jinlong(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 266580,Heilongjiang,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590 [2]哈尔滨工程大学水声工程学院,黑龙江哈尔滨266580

出　　处：《声学技术》2025年第1期29-39,共11页Technical Acoustics

基　　金：中国博士后科学基金(2020M670891);山东省自然科学基金面上项目(ZR2022MA051);山东科技大学科研创新团队支持计划(2019TDJH103)资助。

摘　　要：传统的等效声速剖面(equivalent sound speed profile,ESSP)法用一个积分面积相等的常梯度声速剖面代替实测复杂声速剖面,减小了波束归位的计算量。然而ESSP的定位精度会随入射角的增大而迅速降低,大入射角波束的测深精度不再满足相关测量规范要求。尤其在非平坦的深海海底,边缘波束由于采用单一等效声速剖面导致产生不可忽略的精度损失。研究表明,对于大入射角波束,等效声速剖面法的定位误差与角度之间呈现明显的二次函数关系。因此针对倾斜深海海底,提出了一种基于等效声速迭代计算的误差修正经验模型,通过迭代计算等效声速剖面,同时利用经验模型分别对大入射角波束的垂向距离和侧向距离进行误差修正。仿真结果表明,相比于常梯度声线跟踪算法,文章提出的经验模型法可达到同等精度水平,并且计算效率提高29倍以上。该方法对多波束测深中海量波束脚印归位具有一定的应用价值。The calculation of beam footprint position can be reduced by the actual complex sound speed profile(SSP)being replaced with the classic equivalent sound speed profile(ESSP),which is a simple constant gradient SSP.However,the positioning accuracy of ESSP decrease rapidly with the increase of the incident angle,and the bathymetry accuracy of the large incident angle beams(edge beams)will no longer meet the requirements of relevant measurement specifications.Especially in the uneven deep seafloor,it will lead to a non-negligible accuracy loss due to single equivalent SSP approximation.The research indicates that the positioning error of the ESSP shows an obvious quadratic function relationship with the angle for edge beams.Therefore,an error correction model based on the iterative calculation of the equivalent sound speed is proposed for inclined deep seafloor environment.The equivalent sound speed profile is calculated iteratively,while error correction of vertical distance and lateral distance of the edge beam is performed with an empirical error correction model.The simulation results show that the positioning accuracy of the proposed algorithm is same as that of constant gradient ray-tracking method,while the computational efficiency is improved by more than 29 times.This method has a quit benefit to the location of massive beam footprints in multibeam sounding.

关 键 词：等效声速剖面法 声线跟踪法 大入射角 深海 误差修正 多波束测深仪 

分 类 号：P229[天文地球—大地测量学与测量工程]