[teqc] Curing files with GPS rolllover issues

Uwe Hessels uwe.hessels at bkg.bund.de
Fri Apr 12 12:50:53 UTC 2019


Lawrence,

thanks for the feedback. I do it in the same way.
It was just a notice, that the obs file seems to
be ok, the nav file not.
I need the nav file only for the CGGTTS generating.

Best regards, Uwe Hessels.

Am 12.04.2019 um 14:46 schrieb lplopresti at enter.net:
> On 2019-04-12 07:47, Uwe Hessels wrote:
>> Dear colleagues,
>>
>> i also still use an old Ashtech Z12T after the week rollover.
>> With the command:
>> teqc -ash s -week ${year}:${dayofyear} +obs inputrawfile.ash
>> outrinexfile.19O
>> i get rinex files, which at least teqc interpreted as correct (+qc):
>>
>> 2019 Apr 12
>> 2019 Apr 12
>>
>> *********************
>> QC of RINEX  file(s) : PTBG102B.19O
>> *********************
>>
>> 4-character ID          : PTBG
>> Receiver type           : ASHTECH Z-XII3T (# = RT902232501) (fw =
>> 1L01-1D04)
>> Antenna type            : ASH701945E_M    SNOW (# = CR6200327009)
>>
>> Time of start of window : 2019 Apr 12  01:00:00.000
>> Time of  end  of window : 2019 Apr 12  01:59:30.000
>> Time line window length : 59.50 minute(s), ticked every 10.0 minute(s)
>> Observation interval    : 30.0000 seconds
>> Total satellites w/ obs : 14
>> NAVSTAR GPS SVs w/o OBS :  4   5   7   8  10  13  15  16  20  21  24
>> 25
>>                           26  27  28  29  30  32
>> Rx tracking capability  : unknown
>> Poss. # of obs epochs   :    120
>> Epochs w/ observations  :    120
>> Epochs repeated         :      0  (0.00%)
>> Complete observations   :   1076
>>  Deleted observations   :     51
>> Obs w/ SV duplication   :      0  (within non-repeated epochs)
>> Moving average MP12     : 0.607154 m
>> Moving average MP21     : 0.556778 m
>> Points in MP moving avg : 50
>> Mean S1                 : 44.23 (sd=5.37 n=1124)
>> Mean S2                 : 41.51 (sd=4.87 n=1124)
>> No. of Rx clock offsets : 0
>> Total Rx clock drift    :  0.000000 ms
>> Rate of Rx clock drift  :  0.000 ms/hr
>> Avg time between resets : Inf minute(s)
>> Freq no. and timecode   : 2 14341 000002
>> Report gap > than       : 10.00 minute(s)
>>        but < than       : 90.00 minute(s)
>> epochs w/ msec clk slip : 0
>> other msec mp events    : 0 (: 25)   {expect ~= 1:50}
>> IOD signifying a slip   : >400.0 cm/minute
>> IOD slips               :     28
>> IOD or MP slips         :     28
>>       first epoch    last epoch    sn1   sn2
>> SSN 19  4 12 01:00 19  4 12 01:59 44.23 41.51
>>       first epoch    last epoch    hrs   dt  #expt  #have   %   mp1
>> mp2 o/slps
>> SUM 19  4 12 01:00 19  4 12 01:59 1.000  30     -    1076  -   0.61
>> 0.56     38
>>
>>
>>
>>
>>
>>
>>
>>
>> I don't have OPUS to check, but perhaps the user can test with one of
>> my files.
>>
>> Only the navigation files stay 1024 weeks off.
>>
>> Best regards, Uwe Hessels.
>>
>>
>>
>> Am 11.04.2019 um 21:39 schrieb Joe Evjen:
>>> FYI only, passing along a possible fix for GPS-week-rollover-affected
>>> GPS data files.
>>>
>>> A user of https://geodesy.noaa.gov/OPUS/ reported collecting a
>>> post-rollover data file on
>>> an old ashtech receiver which looked normal, except all time tags were
>>> 1024 weeks off, in
>>> August 1999. Using teqc
>>>
>>> "with: Teqc -week 2048 B_T3_A99.235 > RT310980.19o Original as
>>> downloaded B file > output
>>> file. That generated a rinex file with the correct date. The file
>>> appears to be a typical
>>> rinex file. However opus returns “...opus doesn’t recognize format...”
>>>
>>>
>>>
>>>
> Uwe,
>
> Correcting the Nav file depends on what you do with the RINEX
> Observation file. OPUS understands that every Nav file for a certain day
> is the same for the observation time period and thus does not need to
> use any individual station Nav file. My personal processing program
> requires the Nav file and if I do not feel like correcting it I copy a
> different receiver Nav file and rename it to match the Observation file.
>
> Lawrence Paul Lopresti
>
>>> _______________________________________________
>>> teqc mailing list
>>> teqc at postal.unavco.org
>>> https://postal.unavco.org/mailman/listinfo/teqc
>>>
>>
>> --
>> Mit freundlichen Grüßen, Uwe Hessels
>> _________________________________________________
>>   Dipl.Ing. Uwe Hessels
>>   Bundesamt für Kartographie und Geodäsie
>>   Geodätisches Observatorium Wettzell
>>   Betriebsgruppe Mikrowellenverfahren VLBI-GNSS-DORIS
>>   Sackenrieder Str. 25
>>   D - 93444 Bad Kötzting
>>
>>   Tel:             +49 (0) 9941 / 603-208 oder -128
>>   FAX:             +49 (0) 9941 / 603-222
>>   switchboard      +49 (0) 9941 / 603-0
>>   e-mail (office)  G_GPS at fs.wettzell.de
>>   e-mail (office)  uwe.hessels at bkg.bund.de
>>   e-mail (altern.) hessels at fs.wettzell.de
>>   URL              http://www.fs.wettzell.de
>>                    http://www.bkg.bund.de
>> _________________________________________________
>>
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-- 
Mit freundlichen Grüßen, Uwe Hessels
_________________________________________________
   Dipl.Ing. Uwe Hessels
   Bundesamt für Kartographie und Geodäsie
   Geodätisches Observatorium Wettzell
   Betriebsgruppe Mikrowellenverfahren VLBI-GNSS-DORIS
   Sackenrieder Str. 25
   D - 93444 Bad Kötzting

   Tel:             +49 (0) 9941 / 603-208 oder -128
   FAX:             +49 (0) 9941 / 603-222
   switchboard      +49 (0) 9941 / 603-0
   e-mail (office)  G_GPS at fs.wettzell.de
   e-mail (office)  uwe.hessels at bkg.bund.de
   e-mail (altern.) hessels at fs.wettzell.de
   URL              http://www.fs.wettzell.de
                    http://www.bkg.bund.de
_________________________________________________



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