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<p class="MsoNormal">Dear colleagues<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">The absolute IGS antenna correction file (igs20_wwww.atx) has been updated.<o:p></o:p></p>
<p class="MsoPlainText">The new release is called 'igs20_2239.atx'. It contains the following
<o:p></o:p></p>
<p class="MsoPlainText">changes:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>According to <a href="https://www.glonass-iac.ru/en/sostavOG/">
https://www.glonass-iac.ru/en/sostavOG/</a> the GLONASS-M satellite R861, launched on 28. November 2022, will be replacing the GLONASS-M satellite 736 in slot 16. Therefore following satellite has been added to the igs20.atx:<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt">R16 (R861): 28. November 2022<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt">As preliminary PCOs the values from GLONASS-M satellite 860 has been used.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>According to NAGU 293-221204 the GLONASS-M satellite 736 was decommissioned.
<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:36.0pt"><o:p> </o:p></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB">293-221204<o:p></o:p></span></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB">NOTICE ADVISORY TO GLONASS USERS (NAGU) 293-221204<o:p></o:p></span></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB">SUBJ:16/-1 (736) TERMINATION OF WORK WITH THE SC
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB">1.CONDITION: 16/-1 736 TERMINATION OF WORK WITH THE 03.12.22/0000<o:p></o:p></span></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB">2.USERS ARE REMINDED TO UPDATE ALMANACS IF NECESSARY<o:p></o:p></span></p>
<p class="MsoListParagraph" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="background:white">The satellite has stopped transmitting since the end of last year. According to CODE the satellite has been tracked until the 17. December 2021 by the IGS network. Therefore following decommission date has
been added:<o:p></o:p></p>
<p class="MsoListParagraph" style="background:white"><o:p> </o:p></p>
<p class="MsoListParagraph" style="background:white">R16 (R736): 17. December 2021<o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Courier New";color:#626566;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2;background:white">
<![if !supportLists]><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>One additional antenna type calibration has been added that where performed by Geoscience Australia:<o:p></o:p></p>
<p class="MsoListParagraph" style="background:white"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4;background:white">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>One robot calibration provided my EMLID:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"> EML_REACH_RX NONE<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2;background:white">
<![if !supportLists]><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Changes taken over from igs14<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4;background:white">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Two chamber calibrated antenna added:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"> CNTAT600 CNTS<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"> CNTT300PLUS NONE<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><o:p> </o:p></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4;background:white">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Radome changed from CNTS to NONE for<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"> CNTAT340, CNTT30, and CNTT300<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><o:p> </o:p></p>
<p class="MsoPlainText">The updated antenna correction model is available at<o:p></o:p></p>
<p class="MsoPlainText"><a href="https://files.igs.org/pub/station/general/igs20_2239.atx">https://files.igs.org/pub/station/general/igs20_2239.atx</a>
<o:p></o:p></p>
<p class="MsoPlainText">and<o:p></o:p></p>
<p class="MsoPlainText"><a href="https://files.igs.org/pub/station/general/igs20.atx">https://files.igs.org/pub/station/general/igs20.atx</a>
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">With best regards,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Arturo Villiger<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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