[teqc] strange Leica 1200 conversion

Lou Estey lou at unavco.org
Tue Oct 20 11:46:37 MDT 2009


Dear Matt,

(for everyone's benefit, I've had some off-line discussions and this
email is just to summarize)

> I've been given some Leica 1200 GX1220+GNSS raw data - one big file per 
> site (~300Mb) covering several months.
> 
> I get two things (using either Oct 19, 2009 teqc or Mar 23, 2009, all 
> 32bit Linux static):
>  
> 1. occasionally Notices of duplicate SVs when converting to one big 
> RINEX, although not too worried about this.
> 
> ! Notice ! duplicate SV G10 @ 2009 Jun 18 09:14:40.000 being eliminated (input = Default_0104_0401_135258.m00) 
> ! Notice ! 2009 Jun 18 15:30:30.000: poss. incr. of sampling int. OR data gap of 20.000 seconds (min. dt found= 10.000 s)

Here teqc is clearly finding duplicate SV listings in certain epochs
and removing the duplicates, and there also appear to be missing epochs.
I agree that there's probably not much to worry about here as far as
the RINEX that is produced is concerned.

> 2. more problematically, when I then try and window that big RINEX file 
> into a day RINEX files, I get occasional errors of the kind
>  
> teqc -st 20090606000000.0 +ds 86399 kns10910_all.09o >! kns11570.09o
> 
> ! Notice ! setting TIME OF FIRST OBS to match requested window: 2009 Jun  6 00:00:00.000 
> ! Notice ! NAVSTAR GPS: bad PRN= 42 being rejected @ 2009 Jun  6 12:32:00.000 (min= 1, max= 32)
> 
> teqc: teqc windowed: delta = 86399.000 secfailure to read 
> '                                G42G61' on line 5461503 of 'kns10910_all.09o' 
>         (invalid satellite number) ... exiting
>  
> G42 and/or G61 appear every now and again. [...]

Clearly we need to find out what's going on in these epochs.  I'll
need some sample to examine.

> Any desire to look at this file? The other 2 or 3 files I have also give 
> similar, so not just a single receiver it seems.

If the problem can be isolated to a small enough chunk of the full
300 Mb file, I'd be willing to look at, say, 1 Mb worth.

cheers,
--lou


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