[teqc] Tow

Lou Estey lou at unavco.org
Tue May 24 08:15:01 MDT 2016


No, the trouble is with the translator.  Having no ToW in the input is no excuse for
putting in a useless and obviously wrong value (9.999000000000e+08).

There is the same issue with some of the formats that teqc reads and converts to
RINEX.  There are two options: 1) just put a value of zero for the ToW (as Werner Gurtner
did in at least one of his early translators) or 2) use the time of the last observation
as a proxy.  (And we also know that the ToW has a granularity of 6 seconds in GPS.)

If the input has no ToW, teqc uses option 2 when possible, i.e. when there are observations.

Hence, I don't except excuses for this.

Plus, somebody needs to fix RTCM. :)

--lou

On 24-May-16 8:00 AM, Dmitry Kolosov wrote:
> Lou,
> I am afraid the problem is not in BNC translator.
> It simply does not have this information to put in RINEX: ToW is not a part of RTCM ephemeris message.
> Dmitry
>
> ----
> Dmitry Kolosov
> Director, Global Application Software Development
> Topcon Positioning Systems
> DKolosov at topcon.com
>
>
>> -----Original Message-----
>> From: teqc [mailto:teqc-bounces at postal.unavco.org] On Behalf Of Lou Estey
>> Sent: Tuesday, May 24, 2016 16:49
>> To: Bonnes Gregory (TELESPAZIO FRANCE) <gregory.bonnes at cnes.fr>
>> Cc: teqc at unavco.org
>> Subject: Re: [teqc] Tow
>>
>> dear Grégory,
>>
>> Well, from teqc's point of view, the RINEX navigation files that BNC-produced in this
>> case are garbage.
>> (Teqc needs the ToW in order to properly order the messages by receive time.) There is
>> no work-around.
>>
>> Maybe you should contact the authors of the BNC tools and ask them to fix their
>> translator.
>>
>> --lou
>>
>> On 24-May-16 7:41 AM, Bonnes Gregory (TELESPAZIO FRANCE) wrote:
>>> Dear Lou,
>>>
>>> I'm trying to make a qc on Rinex2.11 files providing by BNC tools (converting RTCM
>> in rinex2 files). And it seems that on RTCM  the ToW is a bad value
>> (9.999000000000e+08) due to a non-transmission of this data. When I do a qc with teqc
>> I have an error like this :
>>>
>>> ! Warning ! NAVSTAR GPS SV G02: magnitude of ephemeris ToE - ToW too large (-
>> 16658640.0 min) @ ToC= 2016 Apr 28 10:00:00.000
>>>
>>> A long time ago with another version of teqc (I don't remember which version), the
>> qc was possible. I would like to know if it's possible to avoid this control.
>>> Thank you for your help
>>>
>>> Gregory
>>>
>>> -----Message d'origine-----
>>> De : Lou Estey [mailto:lou at unavco.org]
>>> Envoyé : mardi 24 mai 2016 15:23
>>> À : Bonnes Gregory (TELESPAZIO FRANCE)
>>> Cc : teqc at unavco.org; lou at unavco.org
>>> Objet : Re: [teqc] Tow
>>>
>>> dear Grégory,
>>>
>>> ToW control?  What exactly are you trying to work around?
>>>
>>> --lou
>>>
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
>>> UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
>>> Boulder, CO  80301-5554            e-mail:  lou  unavco.org
>>>       WWW:  http://www.unavco.org   http://jules.unavco.org
>>>
>>> "If the universe is the answer, what is the question?"
>>>                                                 -- Leon Lederman
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> On 24-May-16 1:17 AM, Bonnes Gregory (TELESPAZIO FRANCE) wrote:
>>>> Dear All,
>>>>
>>>> Is it possible to desactivate the teqc control for the ToW in navigation messages ?
>>>>
>>>> Thank you
>>>>
>>>> Best Regards/ Meilleures Salutations
>>>>
>>>> Grégory BONNES
>>>>
>>>> REGINA project
>>>> Tel :+33 (0)5 61 27 31 31  (office 7.56.10) / +33 (0)6 09 06 53 24
>>>> Email : _gregory.bonnes at cnes.Fr_ <mailto:thierry.lawrence at cnes.fr>
>>>> TELESPAZIO France support for CNES's operations



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