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IVS Contribution to ITRF2020

In 2020, the ITRS Center of the International Earth Rotation and Reference Systems Service (IERS) will begin assembling the next realization of the International Terrestrial Reference Frame, ITRF2020. VLBI Analysis Centers are encouraged to submit their station and velocity analysis for this effort. This web page provides guidelines for Analysis Centers to use in their ITRF2020 submissions, as well as files to support the analysis.

This web-page will be updated as information changes. A summary of the changes is given at the bottom of the web-page to help you identify things that might have changed since your last visit.

ITRF2020 Participation Call and Checklist

Tentative Schedule

The following is a tenative schedule. Please note that the first submissions to the combination center are due on August 1. This should give us time to find and fix any problems that we find.
  • 2020-Aug-01: Initial AC submission to IVS Combination Center. Combination Center will provide feedback to ACs on any problems encountered.
  • 2020-Nov-01: First combined solution from IVS Combination Center. Combination Center will provide feedback to ACs on any problems encountered.
  • 2020-Nov-01-2020-Jan-20: ACs submit additional sessions to Combination Center as they become available.
  • 2021-Feb-10: IVS submission for ITRF2020 due.
  • 2021-Apr-10: Revised IVS submission for ITRF2020 due.

IVS Analysis Centers Contributing to ITRF2020

The following Institutions have commmited to contributing to ITRF2020. The last two columns list the number of sessions submitted.
Institution Contacts Software S/X VGOS
ASI CGS Roberto Lanotte Calc/Solve 6466 38
BKG Anastasiia Girdiuk Calc/Solve 6084 38
DGFI-TUM Matthias Glomsda DOGS-RI 6456 38
GFZ Potsdam Kyriakos Balidakis PORT 6514 38
NASA GSFC Dan MacMillan
John Gipson
Calc/Solve 6469 38
IAA Sergey Kurdubov
Svetlana Mirinova
Elena Skurikhina
QUASAR 6490 23
Norwegian Mapping
Authority
Ann-Silje Kirkvik Where 6468 38
Paris Observatory Sebastien Lambert Calc/Solve 6481 38
Onsala Observatory Rüdiger Haas ASCOT 6519 38
TU-Wien Johannes Böhm VievS 6391 38
USNO Megan Johnson Calc/Solve 5931 -

This list was last updated on 2021Feb10. It reflects the session list as of 2021Jan15.

Sessions submitted

The links below have tables to which institutions have submitted which sessions. The IVS goal is to have all institutions submit all sessions. You can use this list to doublecheck that we have received your submissions. This list will be updated monthly, or whenever a new Anaylsis Center submits its contribution.

Sessions submitted as of 2021Feb10

Session list

All IVS Analysis Centers should submit results for the complete list of IVS sessions for ITRF2020. This list will change over time as new sessions complete processing and preliminary analysis. The most recent list is immediately below. If you have problems finding any of the sessions on the list please let us know. Conversely, if there are sessions that we have missed, please let us know so that we can update the list. This will be the first time the IVS submits VGOS data. The VGOS and S/X data sessions are listed separately below.

We exclude all sessions shorter than 24 hours or fewer than 3 stations. We also exclude some other problematic sessions.

The 2021Apr06 S/X session list is presented below. 250 session were removed compared to the 2020Dec18 session list. These are sessions which are shoter than 15 hours or problematic in some other way.

The 2021Jan15 VGOS session list is presented below.

Special Considerations for ITRF2020

Handling of Sources

In contrast to previous ITRF submissions, this submission will include source coordinates. To prevent singularity problems with the normal equations if the number of observations is too small, it is strongly recommended that if a source has fewer than 4 good observations in a session that no observations involving that source be used in constructing the normal equations.

Pressure Loading

In contrast to previous IVS submissions to ITRF, this submission will include the effect of atmospheric pressure loading. Since the other space geodetic techniques still (!!) do not routinely include this, we need to include information in the SINEX file to allow for the removal of pressure loading.

New models in ITRF2020

The following models are new in ITRF2020. If you do not use these models your submission will be rejected. The first two are for all Space Geodetic techniques,while the second two are for VLBI only.

Auxiliary files for use in ITRF2020

For the IVS submission to ITRF2020 all ACs should use the same axis-offsets. The GSFC VLBI group has generated a file which contain axis-offsets in a form suitable for use by calc/solve. The axis offset values came from ground surveys if they were available, and from a large global solution otherwise.

You can also use the information in antenna_info.txt maintained by Axel Nothnagel which also contains the thermal deformation models you should use.

There are other files to be used in ITRF2020. The IVS Analysis Coordinator will notify you if these files change.

History of changes

This section lists major changes to this website to help you identify important changes since the last time you visited.
  • 2021Jan15: Updated session list.
  • 2020Dec04: Updated session list. Removed links to old lists.
  • 2020Nov16: Updated session list.
  • 2020Oct23: Updated session lists; updated sumbitted sessions.
  • 2020Sep30: Updated submitted session lists. Modified AC table: Added Onsala, number of sessions.
  • 2020Aug19: Updated AC table, submitted sessions table.
  • 2020Aug15: Added new links to tables which show which ACs have sumbitted which sessions. Some reorganization
  • 2020Aug05: Added USNO to AC list. Updated Session lists
  • 2020May06: Added DGFI-TUM and IAA to AC list.
  • 2020May06: Added tentative schedule. Updated session files. Updated axis offset file. Updated AC list
  • 2020Apr24: Updated axis offset files.
  • 2020Jan30: Updated IVS AC contributing to ITRF2020.
  • 2020Jan27: Added ITRF2020 axis offset file. Updated information on sesssions to include VGOS session.
  • 2020Jan16: Added section on participation in ITRF2020.
  • 2020Jan14: Major revamp. Include session list, new eccentricity file, submission checklist, information about pressure loading.
  • 2019Nov21: New gravity deformation file
  • 2019Aug20: Preliminary version.



The position of the IVS Analysis Coordinator is currently supported by NASA GSFC. NASA + Privacy Policy and Important Notices Last updated: 2020Aug15