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Sensors 2014, 14(3), 5552-5572; doi:10.3390/s140305552
Article

Estimates of Minor Ocean Tide Loading Displacement and Its Impact on Continuous GPS Coordinate Time Series

1
, 2,* , 3
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 and 2
Received: 7 January 2014; in revised form: 13 February 2014 / Accepted: 18 February 2014 / Published: 20 March 2014
(This article belongs to the Section Remote Sensors)
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Abstract: The site displacement due to ocean tidal loading is regarded as one of the largest uncertainties in precise geodetic positioning measurements, among which the effect of minor ocean tides (MOT), except for the 11 main tidal constituents, are sometimes neglected in routine precise global positioning system (GPS) data processing. We find that MOT can cause large vertical loading displacements with peak-to-peak variations reaching more than 8 mm at coastal/island stations. The impact of MOT on the 24-hour GPS solution is slightly larger than the magnitude of MOT loading itself, with peak-to-peak displacement variation at about 10 mm for the horizontal and 30 mm for the vertical components. We also find that the vertical velocity of all the selected stations in the Southwest Pacific was reduced by more than 10% after considering the MOT effect, while stations with weighted root mean square reduced data account for 62%, 59%, and 36% for the up, east, and north components respectively, in particular for most coastal/island stations. Furthermore, MOT correction could significantly reduce the annual signal of the global stacked east component, the near fortnightly and the long-term periodic signals in the up component. The power of some anomalous harmonics of 1.04 cycle per year is also decreased to some extent. These results further proved the benefits of MOT correction in precise GPS data processing.
Keywords: ocean tidal loading; minor ocean tides; GAMIT/GLOBK; GPS data reprocessing; weighted root mean square analysis; spectrum analysis; anomalous harmonics ocean tidal loading; minor ocean tides; GAMIT/GLOBK; GPS data reprocessing; weighted root mean square analysis; spectrum analysis; anomalous harmonics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Li, Z.; Jiang, W.; Ding, W.; Deng, L.; Peng, L. Estimates of Minor Ocean Tide Loading Displacement and Its Impact on Continuous GPS Coordinate Time Series. Sensors 2014, 14, 5552-5572.

AMA Style

Li Z, Jiang W, Ding W, Deng L, Peng L. Estimates of Minor Ocean Tide Loading Displacement and Its Impact on Continuous GPS Coordinate Time Series. Sensors. 2014; 14(3):5552-5572.

Chicago/Turabian Style

Li, Zhao; Jiang, Weiping; Ding, Wenwu; Deng, Liansheng; Peng, Lifeng. 2014. "Estimates of Minor Ocean Tide Loading Displacement and Its Impact on Continuous GPS Coordinate Time Series." Sensors 14, no. 3: 5552-5572.



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