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<p class="MsoNormal"><span style="font-size:11.0pt">Dear Colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">As some of you may have already noted:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Several IGS stations equipped with Septentrio PolaRx5 series receivers apparently tracked and recorded two R24 GLONASS satellite signals, creating two R24 observables for the same epoch, off and on, starting
2020-08-13 through end of day 2020-08-14. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">At JPL, the affected tracking records caused failures at the compression step of our automated processes and led to all-observation data gaps in published RINEX-3 data files, only.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">JPL has removed R24 satellite observables from the affected RINEX-3 files and will resubmit the affected daily files shortly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The stations and days impacted by this event are as follows (YYYY.DDD):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">ABPO, ARUC, DGAR, IISC, MATZ (albeit not-IGS), SUTH, VACS: 2020.226<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">CHPI, FALK, GODE, USUD: 2020.226 and 2020.227<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">BREW, HAL1, JPLM, KOKB, MDO1, MKEA, NLIB, PIE1: 2020.227<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best regards and health,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-dave<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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