<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Dear Data Centers,</p>
<p>It has come to our attention that certain Javad stations have
mixed CNAV and LNAV navigation messages causing problems in the
"merged" navigation files that we generate at each of the Data
Centers. The problem is very dependent on the order the stations
are read and the specific participating stations but for sure the
CDDIS "brdc" has been affected, and they have now implemented an
exclusion of all these stations to try to prevent any more
problems, while the station operators tries to fix the problem,
please exclude these sites from your "merged" navigation files as
if you use the navigation files from these stations it is possible
some bad messages will get into the merged file and be very
difficult to detect.</p>
<p>... all these stations need excluding from the Rinex 2 "brdc"
generation as they suffer the same problem as the other stations
...</p>
<br>
<tt>AREQ</tt><br>
<tt>ARHT</tt><br>
<tt> </tt><tt>BOGT</tt><br>
<tt> </tt><tt>BSHM</tt><br>
<tt> </tt><tt>CORD</tt><br>
<tt> </tt><tt>CRO1</tt><br>
<tt> </tt><tt>CUSV</tt><br>
<tt> </tt><tt>DGAR</tt><br>
<tt> </tt><tt>FAIR</tt><br>
<tt> </tt><tt>GLPS</tt><br>
<tt> </tt><tt>GUAM</tt><br>
<tt> </tt><tt>HRAO</tt><br>
<tt> </tt><tt>MADR</tt><br>
<tt> </tt><tt>MCM4</tt><br>
<tt> </tt><tt>MOIU</tt><br>
<tt> </tt><tt>PALM</tt><br>
<tt> </tt><tt>PIMO</tt><br>
<tt> </tt><tt>QUIN</tt><br>
<tt> </tt><tt>SANT</tt><br>
<tt> </tt><tt>SEY2</tt><br>
<tt> </tt><tt>STHL</tt><br>
<tt> </tt><tt>ZAMB</tt><br>
<tt> </tt><br>
<p>Thanks, and please send us any comments or concerns that may come
up.<br>
</p>
<pre class="moz-signature" cols="72">--
Best regards,
Nacho
_______________________________________________________________
Ignacio (Nacho) Romero
Aerospace Engineer, PhD
CSC Ltd @ ESA/ESOC/OPS-GN
Satellite Navigation Engineer @ ESOC Navigation Support Office
IGS Infrastructure Committee Chair
<a class="moz-txt-link-abbreviated" href="http://www.navigation-office.esa.int">www.navigation-office.esa.int</a>
<a class="moz-txt-link-abbreviated" href="http://www.canaryspaceconsulting.co.uk">www.canaryspaceconsulting.co.uk</a>
_______________________________________________________________
This message including any attachments may contain confidential
information, according to our Information Security Management System,
and intended solely for a specific individual to whom they are addressed.
Any unauthorised copy, disclosure or distribution of this message
is strictly forbidden. If you have received this transmission in error,
please notify the sender immediately and delete it.</pre>
</body>
</html>