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IERS Message No. 489                                  September 25, 2023
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DTRF2020 release update to Version v2


Dear colleagues,

We have re-uploaded some files provided together with DTRF2020. Please
find the new files in the DTRF2020 release version v2 under the current
Zenodo link <https://zenodo.org/record/8369167>.

The DTRF2020 solution and all other files not commented below remain
unchanged.

The updated/corrected files are:

1) non-tidal loading (NTL) time series referring to CM and CF and the
files listing the offsets and trends by which the time series are
reduced.
filenames:
NTL_{CF|CM}_${technique}_{neu|xyz}.tar
NTL_{CF|CM}_${technique}_reduced_offsets_and_drifts.tar

2) the extended post-seismic deformation (PSD) time series for
GILCREEK/VLBI.
filename: PSD_VLBI.tar

3) the DTRF2020 solution description.
filename: Description_of_DTRF2020_solution_20230920.pdf

The updates/corrections were necessary for the following reasons:

for 1) An incorrect reduction of the published NTL time series by offset
and drift. Furthermore, offsets and drifts by which the NTL time series
are reduced are now given at the DTRF2020 reference epoch 2010-01-01.

for 2) The first epochs of the PSD time series were missing in the
GILCREEK PSD file.

for 3) The DTRF2020 solution description has been extended by the
important information which GNSS satellite and receiver antenna
corrections have to be used together with DTRF2020. We have also added a
note on the use of mean range biases in case of SLR.

The changes concern:

- Applications that include the NTL time series

- GNSS applications that previously used the corrections provided in the
  IGS antenna correction file igs20.atx for satellite antennas.

For reasons of scale consistency, the corrections provided in IGSR3.atx
must be used for the satellite antennas instead. The correction for the
receiver antennas can be taken either from IGSR3.atx or from the
continuously updated file igs20.atx.

We thank all our colleagues, who pointed out these issues to us.
We apologize for any inconveniences!

Best regards,
Manuela Seitz in behalf of the DTRF2020 team


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