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Author(s): |
Guohua Chen, Dept. of Real Estate and Built Environment, National Taipei University, Taipei 23741, China
Yiru Chen, Dept. of Civil Engineering, National Chiao Tung University, Hsinchu 30010, China
Qihsun Huang, Dept. of Civil Engineering, National Chiao Tung University, Hsinchu 30010, China
Jinwei Huang, Dept. of Civil Engineering, National Chiao Tung University, Hsinchu 30010, China |
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Abstract: |
From 2004 to present, the GPS phase observation data have been collected in the shipborne gravity measurement around Taiwan, which are used to determine sea surface heights (SSHs) that are equivalent to satellite altimeter-derived SSHs. The ship-based SSHs are corrected for ocean tide and body tide effects, but no tropospheric and onospheric corrections are needed because they are already applied in GPS positioning. In coastal areas, satellite altimetry is often affected by bad radar waveforms, but ship-based altimetry is not, which makes ship-base altimetry can obtain more accurate SSH than satellite altimetry. In this paper, precise point positioning (PPP) technique is used to determine the ellipsoid heights of ship, and the positioning accuracies are assessed by comparing with DGPS and analyzing the crossover difference of SSHs. This paper will also present the limitation and the prospect of ship-based altimetry.
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