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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Dear colleagues,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>we received the following information of CSNO/TARC concerning the upcoming decommissioning of BeiDou-2 satellites and the reassignment of the present BDS-2 PRNs to BDS-3 satellites. This implies that PRN 1-18 will, in the near future, be transmitting modernized BeiDou signals and may have implications on <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><ul style='margin-top:0cm' type=disc><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Receiver operation (e.g., PRN specific configuration of tracked signals)<o:p></o:p></span></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Data processing (e.g., no more need for intra-constellation biases or PRN-specific distinction of tracked signals)<o:p></o:p></span></li></ul><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>We recommend to take proper preparation for this important transition and carefully watch its actual implementation<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>With best regards, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US'>Oliver Montenbruck <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><span style='font-size:11.0pt;font-family:"MS Gothic"'>耿</span><span style='font-size:11.0pt;font-family:"Microsoft JhengHei",sans-serif'>长江</span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> <gengchj@csno-tarc.cn> <br><b>Sent:</b> Sonntag, 22. </span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>März 2026 04:41<br><br></span><span style='font-family:"Microsoft YaHei",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>Dear colleagues:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>As most of BDS-2 satellites have exceeded their designed service life a lot. We plan to decommission some of that. Meanwhile, we would adjust the PRN of BDS-3 satellite. This operation may impact the data processing system of different analysis centers, so we would appreciate if relevant parties could make necessary preparations for that. The specific schedule for satellite operation will be notified in a timely manner.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>The details for PRN adjustment could be find:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'><a href="https://www.csno-tarc.cn/notice/noticeDetail?id=990&lang=en">https://www.csno-tarc.cn/notice/noticeDetail?id=990&lang=en</a> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>Thanks and best regards!<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>2026.03.22 <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>Geng Changjiang<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Microsoft YaHei",sans-serif'>Test and Assessment Research Center of China Satellite Navigation Office.<o:p></o:p></span></p></div></div></div></body></html>