The method of sound speed errors correction in GNSS-acoustic location service

被引：0
|
作者：
Chen G. [1 ,2 ]
Gao K. [3 ,4 ]
Zhao J. [5 ]
Liu J. [3 ,4 ,5 ]
Liu Y. [1 ,2 ,5 ,6 ]
Liu Y. [1 ,2 ,5 ,6 ]
Li M. [1 ,2 ,6 ]
机构：
[1] First Institute of Oceanography, Ministry of Natural Resources, Qingdao
[2] Key Laboratory of Oceanic Surveying and Mapping, Ministry of Natural Resources, Qingdao
[3] GNSS Research Center, Wuhan University, Wuhan
[4] National Engineering Center for Satellite Positioning System, Wuhan
[5] School of Geodesy and Geomatics, Wuhan University, Wuhan
[6] School of Earth Sciences and Engineering, Hohai University, Nanjing
来源：
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | 2023年 / 52卷 / 04期
基金：
中国国家自然科学基金;
关键词：
empirical orthogonal function; GNSS-acoustic positioning; mapping function correction; sound speed error; sound velocity tomography;
D O I：
10.11947/j.AGCS.2023.20220097
中图分类号：
学科分类号：
摘要：
Sound speed error is the main error source in GNSS-acoustic positioning, which restricts the accuracy of GNSS-acoustic positioning service. Based on the idea of marine space-time frame network, this paper studies the correction method of sound speed error in GNSS-acoustic location service. First, an improved empirical orthogonal function (EOF) method is proposed to construct the sound speed model hierarchically to eliminate the temporal-spatial representation error of sound speed. Then, for the sea area without sound speed profile, the idea of GNSS-acoustic location argument service is proposed based on GNSS tropospheric error processing method. Finally, for the underwater vehicle location argument service, the analysis of the ocean sound speed tomography method is carried out. The above correction idea of sound speed error is verified by using the measured data of 3000 m depth sea area in the South China Sea. The results show that the sound speed field constructed by the improved EOF method can determine the position of seafloor reference station with the decimeter-level accuracy. Based on the seafloor reference stations, the GNSS-acoustic location argument service proposed in this paper can provide decimeter-level accuracy location service for the ship within 3 km. The regional accuracy of the tomographic ocean sound speed profile in the depth interval below the underwater vehicle is better than 3.5 m/s. © 2023 SinoMaps Press. All rights reserved.
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页码：536 / 549
页数：13
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