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Kosek, Wieslaw, Popinski, Waldemar, Wn\kek, Agnieszka, Sosnica, Krzysztof, and Zbylut-Górska, Maria, 2020. Analysis of Systematic Errors in Geocenter Coordinates Determined From GNSS, SLR, DORIS, and GRACE. Pure and Applied Geophysics, 177(2):867–888, doi:10.1007/s00024-019-02355-5.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2020PApGe.177..867K,
author = {{Kosek}, Wies{\l}aw and {Popi{\'n}ski}, Waldemar and {Wn{\k{e}}k}, Agnieszka and {So{\'s}nica}, Krzysztof and {Zbylut-G{\'o}rska}, Maria},
title = "{Analysis of Systematic Errors in Geocenter Coordinates Determined From GNSS, SLR, DORIS, and GRACE}",
journal = {Pure and Applied Geophysics},
keywords = {geocenter, wavelet semblance filtering, DORIS, GNSS, SLR, GRACE},
year = 2020,
month = feb,
volume = {177},
number = {2},
pages = {867-888},
abstract = "{The goal of this paper is to determine and analyze the common geocenter
signal from the geocenter coordinates based on four independent
techniques: Doppler Orbitography and Radiopositioning Integrated
by Satellite (DORIS), Global Navigation Satellite System (GNSS),
Gravity Recovery And Climate Experiment with the ocean bottom
pressure model, and Satellite Laser Ranging, and to analyze the
residuals as the differences between these geocenter coordinates
and their common signal. Another objective of this paper is to
compute variable amplitudes and phases of the annual and semi-
annual oscillations in the geocenter coordinates of these
techniques by the combination of the Fourier Transform Band Pass
Filter (FTBPF) with the Hilbert Transform (FTBPF + HT) and to
compare their mean values with those obtained by other authors.
It was assumed that the geocenter time series of individual
techniques consist of the common signal of geocenter motion,
systematic errors resulting from orbital modeling and noise.
Generally, the annual oscillation amplitudes in these techniques
computed by the FTBPF + HT vary in time and their mean values
are of the order of 2 mm for the X coordinate, 2.4-3.6 mm for
the Y coordinate and 2.8-5.6 mm for the Z coordinate and the
semi-annual oscillation amplitude is variable and about two
times smaller than the annual one. The phases of these two
oscillations are also variable, there are differences in their
mean values for different techniques and the semi-annual
oscillation phases changes throughout the entire phase range. To
detect the common geocenter signal the wavelet-based semblance
filtering (WBSF) method was applied. The weighted mean model was
computed from all geocenter coordinate pairs from individual
techniques assuming weights as inversely proportional to the
variances of differences between the geocenter coordinates and
their corresponding WBSF outputs. The average and median models
computed from these outputs show a good agreement with the
weighted mean model and generally, the average amplitudes of the
annual signal in these models are of the order of 2 mm in each
geocenter coordinate. The FTBPF amplitude spectra of these
models reveals the retrograde annual oscillation in the XY
equatorial plane. The FTBPF and FTBPF + HT amplitude spectra of
geocenter time series and their residuals show mainly the maxima
of different heights in the annual frequency band. The annual
oscillations left in all residuals and oscillations with period
less than \raisebox{-0.5ex}\textasciitilde 120 days in DORIS and
GNSS amplitude spectra may be caused by systematic errors of
techniques resulting from mis-modeling of satellite orbits.}",
doi = {10.1007/s00024-019-02355-5},
adsurl = {https://ui.adsabs.harvard.edu/abs/2020PApGe.177..867K},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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