Impacts of GNSS position offsets on global frame stability

Griffiths, J.; Ray, J.

doi:10.1093/gji/ggv455

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Impacts of GNSS position offsets on global frame stability

2015
By Griffiths, J. ; Ray, J.
Source: Geophysical Journal International, 204(1), 480-487

[PDF-1.49 MB]

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Journal Title:

Geophysical Journal International
Personal Author:

Griffiths, J. ; Ray, J.

Griffiths, J. ; Ray, J. Less -
NOAA Program & Office:

NGS (Office of National Geodetic Survey) ; NOS (National Ocean Service)

NGS (Office of National Geodetic Survey) ; NOS (National Ocean Service) Less -
Description:

While it has been known for some time that offsets in the time-series of Global Navigation Satellite System (GNSS) position estimates degrade station velocity determinations, the magnitude of the effect has not been clear. Using products of the International GNSS Service (IGS), we assess the impact empirically by injecting progressively larger numbers of artificial offsets and solving for a series of long-term secular GNSS frames. Our results show that the stability of the IGS global frame datum is fairly robust, with significant effects at the formal error level only for the Rx (and Y-pole) and Rz rotational orientations. On the other hand, station velocity estimates are more seriously affected, especially the vertical component. For the typical IGS station, the mean vertical rate uncertainty is already limited to 0.34 mm yr−1 for the current set of position discontinuities. If the number of breaks doubles, which might occur using newer detection schemes, then that uncertainty will worsen by ∼40 per cent to 0.48 mm yr−1. This error source is generally a more important component of realistic velocity uncertainties than any other, including accounting for temporal correlations in the GNSS data. The only way to improve future GNSS velocity estimates is to severely limit manmade displacements at the tracking stations.
Keywords:

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Geochemistry And Petrology Geophysics
Source:

Geophysical Journal International, 204(1), 480-487
DOI:

https://doi.org/10.1093/gji/ggv455
ISSN:

0956-540X;1365-246X;
Format:

PDF
Publisher:

Oxford University Press (OUP)
Document Type:

Journal Article
License:

https://creativecommons.org/publicdomain/zero/1.0/
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CC0 Public Domain
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urn:sha-512:e46543404acbf97ea8434c5b0e54aa89ef63aed009902a913f22a1855d5fc22af1e140648bab5b31510b535f82da22c296e05bf54bb032851b22a60ac21f32bf
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https://repository.library.noaa.gov/view/noaa/64411/noaa_64411_DS1.pdf
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Impacts of GNSS position offsets on global frame stability

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