Improving estimates of ocean tide loading displacements with multi-GNSS: a case study of Hong Kong

Wei, Guoguang1; Chen, Kejie1; Ji, Run2

2022

10.1007/s10291-021-01212-0

GPS SOLUTIONS   影响因子和分区

1080-5370

1521-1886

The use of Global Positioning System (GPS) to estimate ocean tide loading (OTL) displacement for K1 and K2 constituents can be unsatisfactory because the periods of K2 and K1, respectively, correspond to the orbital period and the revisit cycle of the GPS constellation. By introducing a multi-global navigation satellite system (GNSS), we studied the estimation of the three-dimensional (3-D) OTL displacement of the eight principal diurnal and semi-diurnal tidal constituents, using kinematic precise point positioning and the data of 10 Hong Kong GNSS stations for 2016-2020. We show that the OTL displacement estimates with a 95% confidence interval achieved by the GPS-only and multi-GNSS solutions, respectively, are commensurate for the M2, N2, O1, and Q1 tidal constituents, but present distinct differences for the S2, K2, K1, and P1 tidal constituents. Sub-millimeter-level agreements between the GNSS estimates and the model predictions (GOT4.10c) are obtained for the M2, N2, O1, and Q1 constituents, but not for the S2, K2, K1, and P1 constituents. Through estimating conformance of the GPS and multi-GNSS estimates versus the model predictions for the S2, K2, K1, and P1 constituents, it is found that the combined GPS/GLONASS/Galileo/BeiDou solution does not give the best estimated agreements with the model predictions although the largest number of satellites are used. At the up component of K2 and P1, the agreements of 2.9-6.0 mm between the GPS-only estimates and the model predictions can be optimally improved to 1.0-1.6 mm by the use of the combined GLONASS/Galileo/BeiDou solution. At the east and north components of K2 and P1, and the north components of K1 and S2, the agreements of greater than 1 mm between the GPS-only estimates and the model predictions can be optimally improved to sub-millimeter level when using the combined GLONASS/Galileo/BeiDou solution. However, the estimate of S2 up component with the combined GLONASS/Galileo/BeiDou solution shows substantial deviation of about 3 mm from the model predictions.

Multi-GNSS Ocean tide loading Displacement Estimation Model predictions

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[42074024]

Remote Sensing

Remote Sensing

WOS:000729084200001

SPRINGER HEIDELBERG

20215011325884

Forecasting ; Kinematics ; Loading ; Oceanography ; Orbits ; Satellites

Oceanography, General:471.1 ; Satellites:655.2 ; Materials Handling Methods:691.2 ; Mechanics:931.1

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China
2.Tech Univ Berlin, Inst Geodesy & Geoinformat Sci, D-10623 Berlin, Germany

Wei, Guoguang,Chen, Kejie,Ji, Run. Improving estimates of ocean tide loading displacements with multi-GNSS: a case study of Hong Kong[J]. GPS SOLUTIONS,2022,26(1).

Wei, Guoguang,Chen, Kejie,&Ji, Run.(2022).Improving estimates of ocean tide loading displacements with multi-GNSS: a case study of Hong Kong.GPS SOLUTIONS,26(1).

Wei, Guoguang,et al."Improving estimates of ocean tide loading displacements with multi-GNSS: a case study of Hong Kong".GPS SOLUTIONS 26.1(2022).