[IGSSTATION-5030] Re: any change at NOVM ?

[Jim.Ray]

Hi Jeff,

Yes.  The IGS recognized a discontinuity for NOVM on 2012:099 due to
an unknown cause; see ftp://igs-rf.ign.fr/pub/discontinuities/soln.snx .
The latest event, if real, is much smaller.  There has been no updated
information from the station for more than 5 years.

--Jim



On 7/30/2012 6:06 PM, Jeff Freymueller wrote:
> Jim,
>
> Is this something new in addition to the large (~10-12 cm) vertical offset at the station on April 13 (week 1683)? That's what I see in my own solutions. In my own solutions, week 1696 looks very much like week 1695, although I have not done anything more than a visual inspection.
>
> Jeff
>
> On Jul 30, 2012, at 11:48 AM, Jim.Ray wrote:
>
>> There were significant AC and combination residuals for NOVM for
>> week 1696 that caused rejections of this station in the SINEX
>> combination:
>>
>> Solution         Stage of rejection      |  Station   |   N       E       U  |
>>                                           |code id soln|  (mm)    (mm)    (mm)|
>> -----------------------------------------|------------|----------------------|
>> esa16967.snx     Combination: Iter. 1    |NOVM  A    2|   0.8     0.1    20.5|
>> gfz16967.snx     Combination: Iter. 1    |NOVM  A    2|  -0.6     0.4   -13.4|
>> sio16967.snx     Combination: Iter. 1    |NOVM  A    2|  -0.8    -0.0   -20.9|
>> mit1696g.snx     Comp. to igs12P1696.snx |NOVM  A    2|  -0.9     8.7    -3.2|
>> ncl1696g.snx     Comp. to igs12P1696.snx |NOVM  A    2|  -2.2    42.9    11.8|
>>
>> Meanwhile there was a shift in the TEQC MP1 and MP2 metrics at about
>> the end of this GPS week; see
>> http://igscb.jpl.nasa.gov/network/site/novm.html .
>>
>> Therefore I wonder if perhaps some unannounced equipment change
>> was made at this station?  The latest log file is from 2006-12-16.
>>
>> --Jim
>>
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>
>
>
> Dr. Jeffrey T. Freymueller         Office: 907-474-7286
> Geophysical Institute              Fax:    907-474-7290
> University of Alaska, Fairbanks    Home:   907-479-3550
> PO Box 757320                      Cell:   907-378-7556
> Fairbanks, AK 99775-7320           email: jeff.freymueller at gi.alaska.edu
> URL: http://www.gps.alaska.edu/jeff/jeff.html
>
> Download Alaska GPS data: ftp://gps.alaska.edu/pub/gpsdata/
>
>