[IGSSTATION-7888] Re: Tracking of G04 with Septentrio receiver

Jan Dousa jan.dousa at pecny.cz
Wed Feb 19 02:36:26 PST 2020


Hi Nacho and Rolf,

we noticed the problem was originally triggered on 22.10.2019,
truely reffering the G04 satellite - unhealthy at that time.
SEPT POLARX5* 5.3.0 were in use at that time, and # of cycle slips
(we observed at all signals) increased significantly for GPS/G04!

It is clearly visible for several stations in the summary plot
based on G-Nut/Anubis QC monitoring of a subset of IGS stations:

https://www.pecny.cz/grc/qc/?spec=net&period=2019-Q4&sites_filter=METGS&sites=&qcparam=obspha_cyc_slps&gnss_filter_net%5B%5D=GPS&view_cnt=1&view_rng=auto&view_rng_min=&view_rng_max=&view_rng_stp=

Interestingly, three stations from the subset also didn't show
the problem though equipped with the same receiver, even though
tracking the L1C (attached list of affected/unaffected stations).

Best regards,
Jan


Dne 2020-02-19 09:19, Nacho Romero napsal:
> Dear Rolf & Emilio,
> 
> 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.
> 
> 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 ?
> 
> 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?
> 
> Thanks again
> 
> 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
> www.navigation-office.esa.int [2]
> www.canaryspaceconsulting.co.uk [3]
> _______________________________________________________________
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> On 18/02/2020 06:02, CODE AC team wrote:
> 
>> Dear colleagues,
>> 
>> 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.
>> 
>> 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).
>> 
>> 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.
>> 
>> Some discussions with Martin Lidberg (responsible for most of the
>> "working" receivers) and colleagues from Septentrio have shown:
>> - tracking the new L1C signal with a Septentrio receiver is causing
>> these problems with the firmware versions 5.3.0 and 5.3.1
>> - the installation of the firmware version 5.3.2 should solve this
>> issue.
>> 
>> Thank you for your consideration.
>> 
>> Best regards
>> 
>> Rolf & Emilio
>> on behalf of the CODE AC
>> 
>> PS: The analysis is done based on our database of 30-sec. RINEX2
>> and RINEX3 files as used for IGS and EPN processing.
>> 
>> _______________________________________________
>> IGSSTATION mailing list
>> IGSSTATION at lists.igs.org
>> https://lists.igs.org/mailman/listinfo/igsstation [1]
> 
> 
> Links:
> ------
> [1] https://lists.igs.org/mailman/listinfo/igsstation
> [2] http://www.navigation-office.esa.int
> [3] http://www.canaryspaceconsulting.co.uk
> 
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