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https://doi.org/10.5194/se-2020-22
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-22
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Mar 2020

Submitted as: research article | 03 Mar 2020

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This preprint is currently under review for the journal SE.

Estimating ocean tide loading displacements with GPS and GLONASS

Bogdan Matviichuk, Matt King, and Christopher Watson Bogdan Matviichuk et al.
  • School of Technology, Environments and Design, University of Tasmania, Hobart, 7001, Australia

Abstract. Ground displacements due to ocean tide loading have previously been successfully observed using GPS data, and such estimates for the principal lunar M2 constituent have been used to infer the rheology and structure of the asthenosphere. The GPS orbital repeat period is close to several other major tidal constituents (K1, K2, S2) thus GPS-estimates of ground displacement at these frequencies is subject to GPS systematic errors. We assess the addition of GLONASS to increase the accuracy and reliability over eight major ocean tide loading constituents: four semi-diurnal (M2, S2, N2, K2) and four diurnal constituents (K1, O1, P1, Q1). We revisit a previous GPS study, focusing on 21 sites in the UK and Western Europe, expanding it with an assessment of GLONASS and GPS+GLONASS estimates. In the region, both GPS and GLONASS data are abundant since 2010.0. We therefore focus on the period 2010.0–2014.0 which is considered long enough to reliably estimate the major constituents. Data were processed with a kinematic PPP strategy to produce site coordinate time series for each of 3 different modes: GPS, GLONASS and GPS+GLONASS. The GPS solution with ambiguities resolved was used as a baseline for performance assessment of the additional modes. GPS+GLONASS shows very close agreement with ambiguity resolved GPS for lunar constituents (M2, N2, O1, Q1) but substantial differences for solar-related constituents (S2, K2, K1, P1). While no single constellation mode performs best for all constituents and components, we propose to use a combination of constellation modes to recover tidal parameters: GPS+GLONASS for most constituents except for K2 and K1 where GLONASS (north and up) and GPS with ambiguities resolved (east), perform best.

Bogdan Matviichuk et al.

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Bogdan Matviichuk et al.

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Latest update: 11 Jul 2020
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Short summary
The Earth deforms as the weight of ocean mass changes with the tides. GPS has been used to estimate displacements of the Earth at tidal periods and then used to understand the properties of the Earth or to test models of ocean tides. However, there are important inaccuracies in these GPS measurements at major tidal periods. We find that combining GPS and GLONASS gives more accurate results for constituents other than K2 and K1; for these GLONASS or ambiguity resolved GPS are preferred.
The Earth deforms as the weight of ocean mass changes with the tides. GPS has been used to...
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