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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">I am pleased to announce that the <b>IGS experimental multi-GNSS (GPS + Galileo + GLONASS) ultra-rapid orbit combinations</b> are now available in the CDDIS (and soon other global data centres) starting from the products of the year 2023,
day of year 358 (GPS week 2294). The products can be found in CDDIS as below:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="text-indent:-18.0pt">1)<span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span>IGS combined multi-GNSS experimental orbits in SP3 format:<span class="apple-converted-space"> </span><a href="https://cddis.nasa.gov/archive/gnss/products/%3CWWWW%3E/IGS0DEM_ULT%3CYYYY%3E%3CDOY%3E%3CHH%3E00_02D_05M_ORB.SP3.gz"><span style="color:#954F72">https://cddis.nasa.gov/archive/gnss/products/<WWWW>/IGS0DEM_ULT<YYYY><DOY><HH>00_02D_05M_ORB.SP3.gz</span></a><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:-18.0pt">2)<span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span>Orbit combination summary files (new refreshed summary file format):<span class="apple-converted-space"> </span><a href="https://cddis.nasa.gov/archive/gnss/products/%3CWWWW%3E/IGS0DEMULT_%3CYYYY%3E%3CDOY%3E%3CHH%3E00_02D_02D_SUM.SUM.gz"><span style="color:#954F72">https://cddis.nasa.gov/archive/gnss/products/<WWWW>/IGS0DEMULT_<YYYY><DOY><HH>00_02D_02D_SUM.SUM.gz</span></a><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:-18.0pt">3)<span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span>Orbit combination summary files in machine-friendly JSON format:<span class="apple-converted-space"> </span><a href="https://cddis.nasa.gov/archive/gnss/products/%3CWWWW%3E/IGS0DEMULT_%3CYYYY%3E%3CDOY%3E%3CHH%3E00_02D_02D_SUM.JSON.gz"><span style="color:#954F72">https://cddis.nasa.gov/archive/gnss/products/<WWWW>/IGS0DEMULT_<YYYY><DOY><HH>00_02D_02D_SUM.JSON.gz</span></a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">where <WWWW> is GPS week, <YYYY> is the year, <DOY> day of year, and <HH> hour of the starting epoch of the file (start of the observed period in the ultra-rapid orbits). At this demonstration phase, these products will become available
about 20 minutes after the ultra-rapid operational products (approximately at 03:20, 09:20, 15:20, 21:20 UTC).<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">It should be noted as the “DEM” Campaign/Project specification in the naming of the files suggests, these products are
<b>demonstration products and experimental only</b>. Users are advised to continue using the
<b>operational products (IGS0OPS*)</b> for their operational routines. The orbit combination algorithm of the demonstration products follows the methodology used for the IGS Repro3 campaign and described in a recently published paper<span class="apple-converted-space"> </span><a href="https://link.springer.com/article/10.1007/s00190-023-01777-3"><span style="color:#954F72">Combination
and SLR validation of IGS Repro3 orbits for ITRF2020</span></a>.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Since these products include the three constellations GPS, Galileo and GLONASS, the IGS GLONASS ultra-rapid orbits (<b>igv*</b> products) will stop soon. Further announcements will be made as to the exact date the igv* products will stop
giving ample time for the users to switch over to the new experimental multi-GNSS products. The DEM summary files contain the comparison statistics for the IGV products so that users can assess the level of difference between the new and old GLONASS orbits,
as well as the differences to the operational GPS orbits.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Further developments and assessments of the multi-GNSS combinations are currently underway within the IGS ACC, IGS MGEX Pilot Project and the IGS multi-GNSS task force in order to progress further in achieving multi-GNSS combined products.<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, Thomas Herring<o:p></o:p></p>
<p class="MsoNormal">IGS ACC 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"><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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