[teqc] G00 appearing in RINEX from Trimble NetR9 .T02 files

Lou Estey lou at unavco.org
Wed Sep 29 08:13:21 MDT 2010


hi Lennard,

The imagination and persistence of you users out there really
amazes me. :)

You did correctly interpret those messages -- it's just that you
are trying to push the usage of some of these options way
beyond what they were designed for.

For the options:
-n_GPS
-n_GLONASS
-n_SBAS
-n_Galileo
one should not use these beyond what would be realistic
values, e.g. 32 for GPS.  The reason for these options was
to allow, in some cases, a more restricted upper bound to
the constellation SV numbers (PRN or slot # for GLONASS), e.g.
for periods of time when there was not GPS PRN#32.  (Approx.
dates of when there was PRN32 are 11 Dec 1992 - 28 Jan 1993 (SVN32),
1 Dec 2006 - 6 Dec 2006 (SVN23), and 27 Jun 2007 - present (SVN23) --
except for other minor outages.  Thus, as far as I know,
PRN32 should not be showing up outside of these dates, and in
such cases use of '-n_GPS 31' might be warranted.) If
SV numbers actually start to exceed what's built into the
teqc code, then the code will have to be updated.

As for the options:
+G/-G
+R/-R
+S/-S
+E/-E
any numbers used here absolutely cannot exceed 32. Period.
(Don't even think about it.)

Now, getting back to what you are trying to do, which is
translate Trimble's .tgd files from a NetR9:  Just ask for
an interim updated build (i.e. sent me the build line from
running `teqc +id`.  The fixes in teqc added in late July
based on the documentation updates from Trimble for reading
their RT27 data structure appear to be working just fine
for us and for the few users who have requested a interim
build.  Or you can wait until the next full release, which
will probably be sometime soon in October.

cheers,
--lou

On 9/29/2010 3:31 AM, Lennard Huisman wrote:
> Hi Lou,
>
> I am having the same problem as described in this topic.
>
> The reason for the problem was explained before, but I was looking for a
> work-around. I did find one, but also found a problem when looking for
> the work-around.
>
> First the work-around that works:
> With runpkr00 I create a tgd file from my NetR9 .T02 file:
> runpkr00 -g -d NetR9.T02 NetR9.tgd
>
> Next with teqc I create my rinex files, which will contain G00 and blank
> lines as explained in this topic before:
> teqc +obs NetR9.10o +nav NetR9.10n,NetR9.10g NetR9.tgd
>
> Using perl replace string 'G00' with 'S26' (SBAS 126 does not appear in
> Australia :) ):
> perl -p -e "s/G00/S26/g" NetR9.10o>  NetR9.obs
>
> Now I remove all (blank) lines from 'S26' and cearte a clean obseravtion
> file:
> teqc -S26 +obs NetR9.10o NetR9.obs
>
> So far so good, however I wanted to use a non-existing PRN number like
> G99, which from the teqc documentation I thought would be possible:
>
> runpkr00 -g -d NetR9.T02 NetR9.tgd
> teqc +obs NetR9.10o +nav NetR9.10n,NetR9.10g NetR9.tgd
> perl -p -e "s/G00/G99/g" NetR9.10o>  NetR9.obs
> teqc -n_GPS 99 -G99 +obs NetR9.10o NetR9.obs
>
> But I get the following message:
>
> ! Warning ! setting NAVSTAR GPS limit to 99 SVs>  current allowable
> maximum = 32
>          (there may be unforseen consequences ...)
> list2mask(): illegal limit for 32-bit mask= 99, offset= 0
> teqc ... exiting
>
> It seems -n_GPS 99 is accepted (the warning), but -G99 not (list2mask
> message?). Did I misunderstand something?
>
> Regards,
> Lennard Huisman
>
>
>
>
>> -----Original Message-----
>> From: teqc-bounces at ls.unavco.org [mailto:teqc-bounces at ls.unavco.org]
> On
>> Behalf Of Lou Estey
>> Sent: Tuesday, 15 June 2010 4:18 AM
>> To: teqc
>> Subject: Re: [teqc] G00 appearing in RINEX from Trimble NetR9 .T02
>> files
>>
>> Simon (and any other NetR9 users),
>>
>> followup from 2 June:
>>
>>> Information from Trimble is pointing toward [specification changes
> of
>>> record 27 for NetR9]. Trimble is
>>> in the process of reviewing an updated draft documentation on the
>> change
>>> for record 27, and then, hopefully, they'll send it along here so I
>> can
>>> see what needs to be changed in the teqc code.
>>
>> This is mostly under control with the new record 27 documentation from
>> Trimble.
>> The basic idea is that Trimble is now using some previously unused
> bits
>> to
>> enable new byte sequences within the record for some new data elements
>> (of which
>> some are for engineering and others might be of use in some RINEX).
>> That you
>> were able to get anything reasonable at all from teqc, as previously
>> written
>> for the original record 27, was very fortuitous.  I'm still awaiting
>> clarification on a few minor points -- on parts that probably would
>> not show up in normal NetR9 user data.  And the new "record 32" (0x20)
>> that
>> was in your data file is encoding of Galileo/GIOVE ion/UTC model
>> parameters.
>> The mismatch of the antenna number string from what's in the .tgd/.mes
>> files
>> vs. the RINEX 2.11 direct from the NetR9 is still a mystery however.
>>
>> cheers,
>> --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
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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