[teqc] dumb clock questions

Geoff Blewitt gblewitt at unr.edu
Mon Aug 29 12:37:57 MDT 2005


Andrew,
   I would think this is normal.  Its likely the actual clock offsets 
were precisely the standard 1 msec, but that offsets that clockprep 
detects in the range and phase data are also subject to change in range 
from epoch to epoch. The additional data offsets have a magnitude of 
about 2% of 1 msec, corresponding to ~ 6 km in range which is in the 
ballpark for 15 sec intervals.  Jeff can correct me if this is not normal.

- Geoff

Andrew Miner wrote:
> Lou--
> 
> I had sort of ruled out hardware since different receivers gave
> essentially identical results, but I guess there could have been something
> wrong with both setups.
> 
> Clockprep seems to fix the files.  I don't have any experience/expertise
> with it, but some of the output is below.  It seemed curious that all the
> offsets in range are close to, but not exactly 1 msec.  Do you know if
> this is normal?
> 
> [minera at pc81639 bdzg_issue]$ /goa/bin/Linux86/clockprep -i BDZG2230.05o -o
> bdzg2230.05o_cp
>   $Id: clockprep.f,v 3.16 2003/08/29 22:11:56 bai Exp $
>   Processing file BDZG2230.05o
>   Station name from RINEX header is BOUN
>   Testing file to determine how it was RINEXed
>   Have read record  7; time  5 8 11 20 57 30
>   Offset in range (msec):  0.981165555
>   Offset in phase (msec): -0.0188342586
>   Break in range but not phase
>   Have read record  58; time  5 8 11 21 10 15
>   Offset in range (msec):  0.985036078
>   Offset in phase (msec): -0.0149649448
>   Break in range but not phase
>   Have read record  111; time  5 8 11 21 23 30
>   Offset in range (msec):  0.982878444
>   Offset in phase (msec): -0.0171217501
>   Break in range but not phase
>   Have read record  164; time  5 8 11 21 36 45
>   Offset in range (msec):  0.974539691
>   Offset in phase (msec): -0.0254601811
>   Break in range but not phase
> ...
> etc, etc.
> 
> 
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-- 
________________________________________________
Dr Geoffrey Blewitt, Professor of Space Geodesy,
NV Bureau of Mines & Geology, and NV Seismo Lab,
University of Nevada, MS178, Reno, NV89557, USA.
http://www.nbmg.unr.edu/staff/geoff.htm
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