Estimates of Vertical Velocity Errors for IGS ITRF2014 Stations by Applying the Improved Singular Spectrum Analysis Method and Environmental Loading Models

  • Anna Klos
  • Marta Gruszczynska
  • Machiel Simon Bos
  • Jean-Paul Boy
  • Janusz Bogusz
Article

Abstract

A reliable subtraction of seasonal signals from the Global Positioning System (GPS) position time series is beneficial for the accuracy of derived velocities. In this research, we propose a two-stage solution of the problem of a proper determination of seasonal changes. We employ environmental loading models (atmospheric, hydrological and ocean non-tidal) with a dominant annual signal of amplitudes in their superposition of up to 12 mm and study the seasonal signal (annual and semi-annual) estimates that change over time using improved singular spectrum analysis (ISSA). Then, this deterministic model is subtracted from GPS position time series. We studied data from 376 permanent International GNSS Service (IGS) stations, derived as the official contribution to International Terrestrial Reference Frame (ITRF2014) to measure the influence of applying environmental loading models on the estimated vertical velocity. Having removed the environmental loadings directly from the position time series, we noticed the evident change in the power spectrum for frequencies between 4 and 80 cpy. Therefore, we modelled the seasonal signal in environmental models using the ISSA approach and subtracted it from GPS vertical time series to leave the noise character of the time series intact. We estimated the velocity dilution of precision (DP) as a ratio between classical Weighted Least Squares and ISSA approach. For a total number of 298 out of the 376 stations analysed, the DP was lower than 1. This indicates that when the ISSA-derived curve was removed from the GPS data, the error of velocity becomes lower than it was before.

Keywords

GPS seasonal signals singular spectrum analysis environmental loadings ITRF2014 dilution of precision 

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Copyright information

© Springer International Publishing 2017

Authors and Affiliations

  • Anna Klos
    • 1
  • Marta Gruszczynska
    • 1
  • Machiel Simon Bos
    • 2
  • Jean-Paul Boy
    • 3
  • Janusz Bogusz
    • 1
  1. 1.Faculty of Civil Engineering and GeodesyMilitary University of TechnologyWarsawPoland
  2. 2.Instituto D. LuisUniversity of Beira InteriorCovilhãPortugal
  3. 3.Institut de Physique du Globe de StrasbourgCNRS/Université de Strasbourg (EOST)StrasbourgFrance

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