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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">The set of Repro3 combined orbit and clock products from the 3rd IGS reprocessing campaign (Repro3) has now been extended to GPS week 2237 (November 6, 2022).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The extended Repro3 combined products generally follow the same combination methodology as those for the period 1994-2020 (see
<a href="https://lists.igs.org/pipermail/igsmail/2022/008244.html">[IGSMAIL-8248]</a> and
<a href="https://igs.org/acc/reprocessing/#repro3">https://igs.org/acc/reprocessing/#repro3</a>.). The only exception is that, since only two Analysis Centres provided phase biases for this extended period, a robust combination of phase biases and integer clock
combinations was not possible. Therefore, the combined clocks for this extended period consist of multi-GNSS legacy clocks with no combined bias products.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Additionally, there have been a couple of name changes based on
<a href="https://files.igs.org/pub/resource/guidelines/Guidelines_For_Long_Product_Filenames_in_the_IGS_v2.0.pdf">
the latest IGS long product filename</a>: clock summary files are now named *CLS.SUM as opposed to previously *CLS.CLS, and *EOP.JSON files are now called *ERP.JSON. These filename changes have been applied to the full Repro3 period.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Similar to the full Repro3 period, the extended Repro3 combined products are consistent with the Repro3 terrestrial frame (SINEX) solutions and are based on the IGSR3/igsR3.atx frame as described in
<a href="https://lists.igs.org/pipermail/igsmail/2023/008325.html">[IGSMAIL-8329]</a>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The extended Repro3 orbit and clock combinations are available in the weekly sub-directories at
<a href="https://cddis.nasa.gov/archive/gnss/products/repro3/">https://cddis.nasa.gov/archive/gnss/products/repro3/</a> and will soon be available in other global data centres. The extended products are based on the contributions of 5 Analysis Centres:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">* COD (Centre for Orbit Determination in Europe) <o:p></o:p></p>
<p class="MsoNormal">* GFZ (GeoForschungsZentrum) <o:p></o:p></p>
<p class="MsoNormal">* GRG (Groupe de Recherche en Géodésie Spatiale) <o:p></o:p></p>
<p class="MsoNormal">* MIT (Massachusetts Institute of Technology) <o:p></o:p></p>
<p class="MsoNormal">* NGS (National Geodetic Survey)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to thank the Analysis Centres who provided their contributions to the extended Repro3 series. I would also like to thank the chair of the IGS PPP-AR working group Professor Jianghui Geng, Zhe Yan and their team at Wuhan University
who performed the clock combinations.<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>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU">Salim Masoumi</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU"> <b>PhD
</b></span><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#006983;mso-fareast-language:EN-AU"> |</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU"> GNSS Team Leader<br>
GNSS Analysis Section | Positioning Australia Branch</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU">Space Division<o:p></o:p></span></p>
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