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

doi:10.11947/j.AGCS.2023.20220097

Abstract

Abstract: 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.

Key words: GNSS-acoustic positioning, sound speed error, empirical orthogonal function, mapping function correction, sound velocity tomography

CLC Number:

P229.2

CHEN Guanxu, GAO Kefu, ZHAO Jianhu, LIU Jingnan, LIU Yanxiong, LIU Yang, LI Menghao. The method of sound speed errors correction in GNSS-acoustic location service[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(4): 536-549.

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