[teqc] GLONASS navigation error

Uwe Hessels uwe.hessels at bkg.bund.de
Fri Jun 20 01:18:00 MDT 2008


Hi Lou,

for us it would be nice to get a new copy for Linux (dynamically linked).

Thanks.

Lou Estey schrieb:
> hi Uwe and others using teqc for Leica GLONASS work:
> 
>> Well, teqc _isn't_ "doing the right thing" when there are these types
>> of non-integer
>> seconds in nav time tags.  Going back to the teqc vs. Spider
>> translations:
>>
>> teqc:
>> 23 08  6 16  0 15 60.0-1.270640641451D-04 3.637978807092D-12
>> 0.000000000000D+00
>>     1.060660107422D+04 1.154708862305D-01-9.313225746155D-10
>> 0.000000000000D+00
>>    -3.738262207031D+03 3.132190704346D+00 0.000000000000D+00
>> 3.000000000000D+00
>>     2.290192138672D+04 4.613704681396D-01-1.862645149231D-09
>> 0.000000000000D+00
>>
>> Leica Spider:
>> 23 08 06 16 00 15  0.0-1.270640641451D-04 3.637978807092D-12
>> 0.000000000000D+00
>>     1.060660107422D+04 1.154708862305D-01-9.313225746155D-10
>> 0.000000000000D+00
>>    -3.738262207031D+03 3.132190704346D+00 0.000000000000D+00
>> 3.000000000000D+00
>>     2.290192138672D+04 4.613704681396D-01-1.862645149231D-09
>> 0.000000000000D+00
>>
>> The correct time for these messages (using the full resolution in the
>> MDB records)
>> is actually 2008 June 16 00:14:59.999, which the RINEX format can't
>> represent,
>> so the Spider software rounds this to 00:15:00.0.
> 
> I've made three changes to check for reading of Leica MDB record 141 and
> LB2 0xd1
> (for GLONASS nav messages); see
> http://facility.unavco.org/software/teqc/log.html
> 
> 1) the math for computing the minutes is now correct if the seconds is
> non-integer,
> 
> 2) the seconds are rounded to the nearest 0.1 second for better
> representation in
> the RINEX format (see ftp://ftp.unibe.ch/aiub/rinex/rinex211.txt --
> Table A11),
> 
> 3) if rounding was necessary (and therefore the internal Leica
> representation of
> the messages times are different from what will be shown in the RINEX),
> then a
> warning message will be printed (unless -warn or +quiet is being used to
> suppress
> all warning messages.
> 
> With the new code, translation of the file with the above MDB record 141
> would
> now yield ...
> 
> [to stderr]
> ! Warning ! GLONASS nav message for slot #23 reported to be for 2008 Jun
> 16 00:14:59.999
>         ... being modified to be for 2008 Jun 16 00:15:00.000
> 
> [in the teqc-produced GLONASS nav file]
> 23 08  6 16  0 15  0.0-1.270640641451D-04 3.637978807092D-12
> 0.000000000000D+00
>     1.060660107422D+04 1.154708862305D-01-9.313225746155D-10
> 0.000000000000D+00
>    -3.738262207031D+03 3.132190704346D+00 0.000000000000D+00
> 3.000000000000D+00
>     2.290192138672D+04 4.613704681396D-01-1.862645149231D-09
> 0.000000000000D+00
> 
> If anyone needs a teqc executable with this correction immediately,
> please let
> me know.  If there are quite a few requests, I'll try to instead do a
> full teqc
> release of all builds.
> 
> 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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> 
> 


-- 
Mit freundlichen Gruessen / Best regards, Uwe Hessels
_________________________________________________
  Dipl.Ing. Uwe Hessels
  Bundesamt fuer Kartographie und Geodaesie /
  Federal Agency for Cartography and Geodesy
  Geodätisches Observatorium Wettzell       /
  Geodetic Observatory Wettzell
  Sackenrieder Str. 25
  D - 93444 Bad Koetzting / Germany

  Phone:           +49 (0) 9941 / 603-208
  FAX:             +49 (0) 9941 / 603-222
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  e-mail (office)  uwe.hessels at bkg.bund.de
  e-mail (altern.) hessels at fs.wettzell.de
  URL              http://www.fs.wettzell.de
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