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Created by
Soja Benedikt, last updated on Jun 24, 2025
2 minute read
Update: the IVS contribution to ITRF2020-u2024 is available here: https://datacenter.iers.org/ITRF2020-u2024/ngzg8g44kj/IVS/
To all IVS Analysis Centers:
Thank you for your valuable contribution to the first ITRF2020 update: ITRF2020-u2023.
The ITRS Center is now looking for input time series for the second ITRF2020 update. It should include data covering the period 2024.0 - 2025.0.
Sessions
Session list S/X (153):
Session list VGOS (34):
Note that also a few remaining sessions from 2023 are listed that were not included in the last ITRF2020 update. Please also process and submit these sessions as defined in the session list.
Not all sessions observed in 2024 are already available for analysis - these are not included in the session lists and thus this ITRF2020 update.
Update: in the combination process, the following sessions were excluded:
- crf142
- crf143
- rd2406
Analysis setup
ACs should use the same strategy and models as for the first update. ITRF2020 should be used as a priori station positions (and not the ITRF2020-u2023 update).
In terms of station-specific models, do not yet use the "antenna-info.txt" file published in January 2025, but the previous version - to be consistent with the operational solutions for 2024. It is available here: https://doi.org/10.48436/qkw7f-r7e76.
Like for the last update, either do not apply atmospheric pressure loading (APL) corrections or apply them and additionally report them in the SINEX files so that they can be removed by the CC.
Information about the first update: https://ivscc.gsfc.nasa.gov/IVS_AC/IVS-AC_ITRF2020_update.htm
Original call for participation in the first update by the ITRS Center, which is also the basis for the second update:
Deadlines
- IVS AC submissions to IVS Combination Center: 28 February, 2025 (
21 February, 2025) - IVS CC submission to ITRS Center: 31 March, 2025 (
28 February, 2025)
Status
as of 2025-03-28
| Institution | Software | Code | Status | Submitted sessions (number) | Submitted sessions (%) |
|---|---|---|---|---|---|
| ASI | Calc/Solve | asi2023b | solutions included in combination | 185 | 99 |
| BKG | Calc/Solve | bkg2023b | solutions included in combination | 175 | 94 |
| DGFI | DOGS-RI | dgf2023c | solutions included in combination | 174 | 93 |
| GFZ | PORT | gfz2024a | solutions included in combination | 180 | 96 |
| GSFC | Calc/Solve | gsf2023a | solutions included in combination | 185 | 99 |
| IGE | Where | ige2023b | solutions included in combination | 182 | 97 |
| NMA | Where | nma2023b | solutions included in combination | 187 | 100 |
| OPA | Calc/Solve | opa2020t | solutions included in combination | 179 | 96 |
| OSO | ASCOT | oso2023a | solutions included in combination | 186 | 99 |
| UAV | VieVS | uav2023b | solutions included in combination | 185 | 99 |
| USNO | Calc/Solve | usn2024b | solutions included in combination | 182 | 97 |
| VIE | VievS | vie2023b | solutions included in combination | 178 | 95 |
| ESA | EPNS | will participate in a future ITRF update | |||
| GSI | Calc/Solve | will participate in a future ITRF update |
History
- 2025-01-15: initial information posted
- 2025-01-29: session lists released, AC deadline postponed
- 2025-02-19: session lists corrected
- 2025-02-26: DOI added to antenna-info.txt file
- 2025-03-28: combination complete and submitted to IERS