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<p class="MsoNormal">Dear Colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Following a few issues identified in some of the IGS combined Repro3 products (<a href="https://lists.igs.org/pipermail/igsmail/2022/008244.html">[IGSMAIL-8248]</a>) , there have been a set of resubmissions for these products to CDDIS global
data centre. These resubmissions are detailed as below:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>It was identified that a number of IGS Repro3 combined clocks suffered from very large jumps at around mid-day and higher epoch-to-epoch noise compared to legacy clock combinations (please see the attached document
for an analysis of the issue. Upon investigation, it was realized that the reason behind these issues were in the choice of the reference clock solution. Please see the attached PDF document provided by Wuhan University for a more detailed analysis of the
issue. There were also additional jumps in the combined clocks due to limited number of available AC solutions at some days. The set of clocks with these problems were reprocessed by Wuhan University, and no longer suffer from this issue. The clock entries
in the SP3 files were subsequently updated to reflect the new clocks. The relevant summary files have been also updated accordingly. The list of days when the clock files were resubmitted are included in the attached file “ydoy_recombined.txt”.<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>A problem was identified in the header of the Repro3 SP3 files where the seconds of week were incorrectly listed as 0.00000000 for all days of the week. This was fixed for the whole Repro3 period, and the updated
SP3 files have now been uploaded to CDDIS.<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>It was found that the clock standard deviations for some of the SP3 files were inserted into a wrong additional column. This was also fixed in the updated SP3 files.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>A couple of filename changes have now been made to align the Repro3 files with the
<a href="https://files.igs.org/pub/resource/guidelines/Guidelines_For_Long_Product_Filenames_in_the_IGS_v2.0.pdf">
latest guideline for long product filenames</a>:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>IGS2R03FIN_${yyyy}${ddd}0000_01D_01D_<b>CLS.CLS</b> files were renamed to IGS2R03FIN_${yyyy}${ddd}0000_01D_01D_<b>CLS.SUM</b> as there is no “CLS” for file format, but instead “SUM” should be used.<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span dir="LTR"></span>IGS2R03FIN_${yyyy}${ddd}0000_07D_01D_<b>EOP.JSON</b> files were renamed to IGS2R03FIN_${yyyy}${ddd}0000_07D_01D_<b>ERP.JSON</b> as the content type to be used based on the filename guideline should be “ERP”, not
“EOP”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please note that the contents of the combined orbits have not changed; therefore, users who only rely on orbits are mainly unaffected (except for the header issue and the clock entries). However, users who use clock/bias products may now
use the updated products.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Apologies for any inconvenience this may have caused, and thanks to Professor Jianghui Geng and Zhe Yan from Wuhan University who carried out the analysis on the clock jumps and reprocessed the clock combinations.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On a relevant note, the backfilling of the IGS combined Repro3 files for the period of 01/01/2021 until 27/11/2022 (the date of switch to IGS20/igs20.atx) is underway and we expect them to be completed by around the end of January 2024.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind Regards,<o:p></o:p></p>
<p class="MsoNormal">Salim Masoumi<o:p></o:p></p>
<p class="MsoNormal">IGS Analysis Centre Coordinator<o:p></o:p></p>
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