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Two campaigns were undertaken within the expanse of the China Sea to assess the accuracy of the Trimble RTX technology. In the first campaign, the accuracy was tested through both static and dynamic modes. The GAMIT/GLOBK software and TRACK module were used to solve the GNSS data and the results were compared with Trimble RTX. In the static mode, the differentials emerged between the Trimble RTX post-processing technology and GAMIT/GLOBK, manifested as 0.60 ± 0.22 cm, -0.22 ± 0.33 cm, and -0.86 ± 0.91 cm along the x, y, and h directions, respectively. Meanwhile, compared with the GAMIT/GLOBK results, real-time data obtained through Trimble RTX exhibited disparities of 1.82 ± 0.85 cm, 2.13 ± 0.86 cm, and 1.33 ± 3.12 cm in the x, y, and h directions, respectively. In the dynamic mode, the differences of the GNSS buoy results between the TRACK module and Trimble RTX technology in the x, y, and h directions are 0.12 ± 5.64 cm, 2.40 ± 1.98 cm, and 2.94 ± 3.27 cm, respectively. In the second campaign, a pioneering equipment, known as high accurate sea surface height measurement system based on mobile platform (HASMS), was harnessed to measure the undulations of the sea surface in southeast of the China Sea. The measured sea surface was compared with CLS_MSS2015 after tidal correction using the FES2014 global tide model. The mean bias between them was -10.99 cm with a standard deviation of 16.31 cm. The collective findings underscore the potential efficacy of the RTX technology in sea surface measurements, poised with an impressive centimeter-level accuracy. Notably, Trimble RTX technology can fulfill the needs of most marine surveying projects in offshore areas.
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