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<p>Dear Rolf & Emilio,</p>
<p>Your recent message about Septentrio receiver indicates issues
with the L1C tracking and some users have concluded that the L1C
observables could be less precise than needed, on the other hand I
think you mean that just tracking the new L1C signal of G04 with
the affected receivers is affecting all other G04 observables. <br>
</p>
<p>Could you please confirm whether your concern is only about the
L1C signal observables and what observables you used to check the
MW linear combination ?</p>
<p>Am I correct in concluding that the upgrade of the PolaRx5
receivers to 5.3.2 is recommended even if the observables of the
L1C are not processed? ... because something (unknown?) is
happening to the other L1 observables?</p>
<p>Thanks again<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>
_______________________________________________________________
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<div class="moz-cite-prefix">On 18/02/2020 06:02, CODE AC team
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a1c73b7c-bd03-14d1-54b0-e990f5706ab3@aiub.unibe.ch">Dear
colleagues,
<br>
<br>
the new GPS Block IIIA is active as PRN G04 since a few months. We
have been concerned in our IGS processing because of a
significantly higher amount of observations that are indicated as
"bad" for this particular satellite.
<br>
<br>
When digging down our colleague Emilio discovered that the
Melbourne-Wuebbena linear combination for this particular
satellite is more noisy than for other satellites for some
stations (30 out of 230). All these sites are equipped with a
Septentrio receiver (POLARX5*, firmware 5.3.x; see attached file).
<br>
<br>
Interestingly, there is also a number of sites with the same
receiver/firmware (MAR6, SPT0, ONSA, QAQ1, SCOR, VIS0, KIR0, ABMF)
where the noise of the MW linear combination is in the usual
range.
<br>
<br>
Some discussions with Martin Lidberg (responsible for most of the
"working" receivers) and colleagues from Septentrio have shown:
<br>
- tracking the new L1C signal with a Septentrio receiver is
causing these problems with the firmware versions 5.3.0 and 5.3.1
<br>
- the installation of the firmware version 5.3.2 should solve this
issue.
<br>
<br>
Thank you for your consideration.
<br>
<br>
Best regards
<br>
<br>
Rolf & Emilio
<br>
on behalf of the CODE AC
<br>
<br>
PS: The analysis is done based on our database of 30-sec. RINEX2
and RINEX3 files as used for IGS and EPN processing.
<br>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
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</pre>
</blockquote>
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