2nd ITRF2020 Update
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To all IVS Analysis Centers:
Thank you for your valuable contribution to the first ITRF2020 update: external page 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): Download itrfu2024_sessions_SX.txt (TXT, 4 KB)
Session list VGOS (34): Download itrfu2024_sessions_VGOS.txt (TXT, 1015 Bytes)
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. It is available here: external page https://doi.org/10.48436/qkw7f-r7e76.
Not all sessions observed in 2024 are already available for analysis - these are not included in the session lists and thus this ITRF2020 update.
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: external page 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: external page 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: Download CFP-ITRF2020-Update (PDF, 1.9 MB)
Deadlines:
- IVS AC submissions to IVS Combination Center: 28 February, 2025 (old: 21 February, 2025)
- IVS CC submission to ITRS Center: 31 March, 2025 (old: 28 February, 2025)
History:
- 15-01-2025: initial information posted
- 29-01-2025: session lists released, AC deadline postponed
- 19-02-2025: session lists corrected
- 26-02-2025: DOI added for antenna-info.txt