[teqc] Curing files with GPS rolllover issues

Uwe Hessels uwe.hessels at bkg.bund.de
Wed Apr 17 11:53:12 UTC 2019


Dear colleagues,

has possibly somebody Ashtech Z-12T Firmware Version 1L01-1D04
available?
Perhaps it is feasable to modify the firmware to adapt it to
the GPS week rollover.

Best regards, Uwe.


Am 12.04.2019 um 15:06 schrieb lplopresti at enter.net:
> Uwe,
>
> For small files I open in a text editor, I use WordPad, and do a global
> find/replace. I corrected two receiver files earlier this week. The
> Ashtech Z-Xtreme was accepted by OPUS, the Ashtech Z Reference Station
> was not. My processor was not to happy with it either?
>
> I hope to figure out what is different.
>
> Lawrence Paul Lopresti
>
> On 2019-04-12 08:50, Uwe Hessels wrote:
>> 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
>> _________________________________________________
>>
>> _______________________________________________
>> teqc mailing list
>> teqc at postal.unavco.org
>> https://postal.unavco.org/mailman/listinfo/teqc
> _______________________________________________
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> 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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