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顾及参考深度误差的海底控制点迭代算法

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针对参考深度误差引起的垂向定位误差问题,提出了顾及参考深度误差的海底控制点迭代算法.首先,分析了参考深度设置不准确对定位结果的影响;其次,对传统控制点解算模型进行了改进,将参考深度加入解算过程的参数更新之中;最后,通过三组不同水深环境仿真实验进行验证,结果表明,268 m和3 000 m水深环境下参考深度误差对垂向定位准确性影响明显,采用新方法可有效提高垂向解的准确性,1 082 m水深环境下参考深度误差对定位结果的影响较小.
Iterative Algorithm of Seafloor Control Points Positioning Taking Reference Depth Error into Account
Objectives:The measurement of three-dimensional absolute coordinates of high-precision sea-floor control points is a key step in the construction of seafloor geodetic control network.The underwater positioning method based on the navigation of the survey ships is an important method to solve this prob-lem.However,the measuring routes are spatially limited,which result in less accurate solutions for the ver-tical coordinates of the control points.To solve this problem,we improve the coordinate calculation method,and use the vertical solution correction value to correct the reference depth information during the iterative process,which improved the accuracy of the slant distance calculation,so that the purpose of im-proving the accuracy of the vertical solution is achieved.Methods:First,the concept of the position line with the same propagation time is introduced.Based on this concept,the influence of the error of reference depth on the calculation of slant range is analyzed.Then the model convergence process of control point po-sitioning under different error relationship curves is analyzed.The position relationship between the refer-ence depth and the real water depth is determined according to the positive or negative of coordinate correc-tion value.Finally,the vertical coordinate correction value is used to correct the reference depth informa-tion,so that the accuracy of vertical solution is improved.Results:The experimental results show that:(1)When the gradient value of the errors relation curve is not zero and there is no error in the sound velocity profile,the traditional method is affected by the reference depth error,so that the error of the vertical solu-tion of the control point coordinate is an order of magnitude higher than that of the horizontal solution.While the new method is almost unaffected.(2)The sound velocity error has little effect on the horizontal solution and a large effect on the vertical solution,and increases with depth.(3)The reference depth error is coupled with the sound velocity error,which further increases the vertical solution error.The new method can reduce the coupling effect.Conclusions:When the gradient value of errors relation curve is zero,the reference depth error causes little change on the positioning result.When the gradient value of errors rela-tion curve is not zero,the reference depth error increases the vertical solution error.The new method can reduce the impact of the reference depth error on the positioning of seafloor control point,and weaken the coupling effect of the sound velocity error and the reference depth error.

seafloor control pointsreference depthray-tracingdistance intersection positioning methodbeam footprint on same propagation time

孙文舟、曾安敏、赵翔

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地理信息工程国家重点实验室,陕西 西安,710054

国家海洋技术中心漳州基地筹建办公室,福建 厦门,361007

海底控制点 参考深度 声线跟踪 距离交会定位 等传播时间位置线

国家重点研发计划地理信息工程国家重点实验室项目青岛海洋科学与技术试点国家实验室问海计划

2020YFB0505801SKLGIE2019-M-1-12021WHZZB1001

2024

10.13203/j.whugis20210337

武汉大学学报(信息科学版)
武汉大学

武汉大学学报(信息科学版)

CSTPCD北大核心
影响因子：1.072
ISSN：1671-8860
年,卷(期)：2024.49(2)
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