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[SGD01-P08] IGS precise ephemeris based on ITRF2020 coordinate system and its application to JISLaD (Japanese Information System of Land Deformation) applying GAMIT/GLOBK program
Keywords:ITRF2020, GNSS, IGS ephemeris, JISLaD, GEONET, GAMIT/GLOBK program
Released in April 2022, the ITRF2020 coordinate system is the latest geocentric reference frame that updates the ITRF2014 coordinate system. The details of this coordinate system can be found in the reference [1], and as in the case of ITRF2014, in ITRF2020 the accurate coordinates at each space geodetic technique observation site are expressed in the terms: i.e.
・Coordinate values and velocities at epoch 2015.0 for each section separated by steps due to co-seismic variations and so on.
・Annual and semi-annual variations represented by a sine function.
・Post-seismic deformation (PSD) represented by multiple logarithmic and exponential functions.
Here, the annual and semi-annual variation parameters, which were not published in ITRF2014, are now available in ITRF2020.
Between ITRF2020 and ITRF2014, the rotation component is determined to have non-net rotation in the core site network, and a seven-parameter transformation formula is released, including translational and rotational components and a scale parameter.
For GNSS, the IGS network site analyzing solution "repro3", which was reanalyzed from epoch 1994.0 to epoch 2021.0 by the IGS analysis center using the IGB14 coordinates of the IGS sites, is provided for the ITRF2020 coordinate system calculation.
From the 2238 GPS week onwards (beginning from November 27, 2022), IGS will provide only precise ephemerides adopted IGS20 coordinates based on the ITRF2020 coordinate system. Precise ephemerides based on ITRF2014 are not provided future on.
The IGS20 coordinate values released by IGS do not include the annual and semi-annual parameters of the above ITRF2020 coordinate system.
Nippo Co., Ltd. has calculated the JISLaD coordinate solution of the GEONET site [5] based on the ITRF2014 coordinate system applying the GAMIT/GLOBK program [3] and the Bernese program [4]. The paper also provides an overview of the application of the JISLaD solution to the ITRF2020 reference frame using the GAMIT/GLOBK program.
Reference
[1] https://itrf.ign.fr/en/solutions/ITRF2020/.
[2] https://igs.org/news/igs20/.
[3] Herring TA, King RW, FloydMA,McClusky SC (2018) Documentation for the GAMIT/GLOBK GPS analysis software. Department of Earth, Atmospheric, and Planetary Science, Massachusetts Institute of Technology
[4] R. Dach, S. Lutz, P. Walser, P. Fridez: Bernese GNSS software version 5.2, Astronomical Institute, University of Bern, 2015.
[5] https://www.jislad.com/about.html
・Coordinate values and velocities at epoch 2015.0 for each section separated by steps due to co-seismic variations and so on.
・Annual and semi-annual variations represented by a sine function.
・Post-seismic deformation (PSD) represented by multiple logarithmic and exponential functions.
Here, the annual and semi-annual variation parameters, which were not published in ITRF2014, are now available in ITRF2020.
Between ITRF2020 and ITRF2014, the rotation component is determined to have non-net rotation in the core site network, and a seven-parameter transformation formula is released, including translational and rotational components and a scale parameter.
For GNSS, the IGS network site analyzing solution "repro3", which was reanalyzed from epoch 1994.0 to epoch 2021.0 by the IGS analysis center using the IGB14 coordinates of the IGS sites, is provided for the ITRF2020 coordinate system calculation.
From the 2238 GPS week onwards (beginning from November 27, 2022), IGS will provide only precise ephemerides adopted IGS20 coordinates based on the ITRF2020 coordinate system. Precise ephemerides based on ITRF2014 are not provided future on.
The IGS20 coordinate values released by IGS do not include the annual and semi-annual parameters of the above ITRF2020 coordinate system.
Nippo Co., Ltd. has calculated the JISLaD coordinate solution of the GEONET site [5] based on the ITRF2014 coordinate system applying the GAMIT/GLOBK program [3] and the Bernese program [4]. The paper also provides an overview of the application of the JISLaD solution to the ITRF2020 reference frame using the GAMIT/GLOBK program.
Reference
[1] https://itrf.ign.fr/en/solutions/ITRF2020/.
[2] https://igs.org/news/igs20/.
[3] Herring TA, King RW, FloydMA,McClusky SC (2018) Documentation for the GAMIT/GLOBK GPS analysis software. Department of Earth, Atmospheric, and Planetary Science, Massachusetts Institute of Technology
[4] R. Dach, S. Lutz, P. Walser, P. Fridez: Bernese GNSS software version 5.2, Astronomical Institute, University of Bern, 2015.
[5] https://www.jislad.com/about.html