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<body lang="EN-AU" link="blue" vlink="purple" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal">Dear Colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The IGS Analysis Centre Coordinator (ACC) is pleased to announce that the combined demonstration multi‑GNSS (GPS + Galileo + GLONASS) Final products, including orbits, clocks, biases, and reference attitudes, are now available via CDDIS
(and soon other global data centres). These demonstration Final products are intended for users who wish to access combined Galileo and GLONASS products beyond the Repro3 period. The products are available starting from GPS week 2238 (2022, day of year 331)
and extend to the current date. They will continue to be provided on an ongoing basis, alongside the already available multi-GNSS ultra-rapid demonstration products. Users are encouraged to make use of these products, test them in their workflows, and provide
feedback to the IGS ACC: <a href="mailto:acc@igs.org">acc@igs.org</a>.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The demonstration products were generated using Geoscience Australia’s
<a href="https://github.com/GeoscienceAustralia/ROCS">ROCS orbit combination software</a>, Natural Resources Canada’s SPARKCombo orbit and clock combination software ( see
<a href="https://link.springer.com/article/10.1007/s00190-019-01335-w">this paper</a> for methodology), and TU Graz’s
<a href="https://github.com/groops-devs/groops">GROOPS software</a> for reference attitudes. GFZ’s
<a href="https://gnss.gfz.de/services/spocc">SPOCC orbit and clock combination software</a> is also being evaluated as part of the multi‑GNSS combination roadmap. We sincerely thank all contributors for their substantial support of the multi-GNSS combination
campaign. In addition, we thank and acknowledge the continued contributions and efforts of all IGS Analysis Centres.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Available Multi-GNSS Demonstration Products<o:p></o:p></b></p>
<p class="MsoNormal">As a result of these developments, the following multi-GNSS combined demonstration products are now available on an ongoing basis:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo1">Final combined multi-GNSS demonstration products (now available from GPS week 2238 and continuing forward on a weekly basis similar to the Final operational products schedule):<o:p></o:p></li><ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Satellite orbits:
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_05M_ORB.SP3.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_05M_ORB.SP3.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Satellite clocks:
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_30S_CLK.CLK.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_30S_CLK.CLK.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Observation-specific phase and code biases:
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_OSB.BIA.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_OSB.BIA.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Reference satellite attitudes:
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_30S_ATT.OBX.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_30S_ATT.OBX.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Orbit combination summary files (human-readable):
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_SUM.SUM.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_SUM.SUM.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Orbit combination summary files (machine-readable):
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMFIN_%3cyear%3e%3cdoy%3e0000_01D_01D_SUM.JSON.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMFIN_<year><doy>0000_01D_01D_SUM.JSON.gz</a><o:p></o:p></li></ol>
</ol>
<p class="MsoNormal" style="margin-left:54.0pt"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="2" type="a">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo1">Ultra-Rapid multi-GNSS demonstration products (already available four times a day since GPS week 2294):<o:p></o:p></li><ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Satellite orbits:
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_05M_ORB.SP3.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_05M_ORB.SP3.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Orbit combination summary files (human-readable):
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_02D_SUM.SUM.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_02D_SUM.SUM.gz</a><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo1">Orbit combination summary files (machine-readable):
<a href="https://cddis.nasa.gov/archive/gnss/products/%3cwwww%3e/IGS0DEMULT_%3cyear%3e%3cdoy%3e%3chr%3e00_02D_02D_SUM.JSON.gz">
https://cddis.nasa.gov/archive/gnss/products/<wwww>/IGS0DEMULT_<year><doy><hr>00_02D_02D_SUM.JSON.gz</a><o:p></o:p></li></ol>
</ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Important Notice: Discontinuation of GLONASS Experimental Products<o:p></o:p></b></p>
<p class="MsoNormal">As both Final and Ultra-Rapid multi-GNSS combined demonstration products are now available and include GPS<b>,
</b>Galileo<b>, </b>and GLONASS, <b>the IGS combined GLONASS experimental Final and Ultra-Rapid products will be discontinued starting with GPS week 2418 (2026, day of year 130 - 10 May 2026)</b>. The following products will no longer be provided after this
date:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2">IGS combined GLONASS experimental Final orbits: igl<wwww><d>.sp3.Z<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2">GLONASS Final orbit combination summary files: igl<wwww>7.sum.Z<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2">IGS combined GLONASS experimental ultra-rapid orbits: igv<wwww><d>_<hr>.sp3.Z<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo2">GLONASS ultra-rapid orbit combination summary files: igv<wwww><d>_<hr>.sum.Z<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Users who rely on GLONASS products are advised to transition their processing chains to the new multi-GNSS combined products.<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>GPS-Only Operational Products<o:p></o:p></b></p>
<p class="MsoNormal">The IGS combined GPS-only Final products (IGS0OPSFIN) will continue to be provided and should be regarded as the primary operational products while the transition to fully operational multi-GNSS combinations is finalized. Further announcements
on this transition will follow.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Salim Masoumi, Taylor Yates, Thomas Herring<o:p></o:p></p>
<p class="MsoNormal">IGS ACC Team<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 Ph.D.</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#333333;mso-fareast-language:EN-AU"> </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>
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