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Open AccessTechnical Note

Adjustment of Transceiver Lever Arm Offset and Sound Speed Bias for GNSS-Acoustic Positioning

1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(13), 1606; https://doi.org/10.3390/rs11131606
Received: 14 May 2019 / Revised: 16 June 2019 / Accepted: 24 June 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Global Navigation Satellite Systems for Earth Observing System)
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Abstract

Global Navigation Satellite System—Acoustic (GNSS-A) positioning is the main technique for seafloor geodetic positioning. A transceiver lever arm offset and sound velocity bias in seawater are the main systematic errors of the GNSS-A positioning technique. Based on data from a sea trial in shallow water, this paper studies the functional model of GNSS-A positioning. The impact of the two systematic errors on seafloor positioning is analysed and corresponding processing methods are proposed. The results show that the offset in the lever arm measurement should be parameterised in the observation equation. Given the high correlation between the vertical lever arm offset and the vertical coordinate of the seafloor station, a sample search method was introduced to fix the vertical offset correction. If the calibration of the sound velocity profiler cannot be ensured, the correction parameter of the sound velocity bias should be solved. According to the refined functional model and corrections, the position of a seafloor station in shallow water can be determined with a precision of better than 1 cm. View Full-Text
Keywords: GNSS-A; lever arm offset; sound velocity bias; sample search GNSS-A; lever arm offset; sound velocity bias; sample search
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Chen, G.; Liu, Y.; Liu, Y.; Tian, Z.; Li, M. Adjustment of Transceiver Lever Arm Offset and Sound Speed Bias for GNSS-Acoustic Positioning. Remote Sens. 2019, 11, 1606.

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