[IGSMAIL-5161]: OPMT RINEX file corrupted for DOY 167

Jim Ray (NGS 301-713-2850 x112) jimr at ngs.noaa.gov
Thu Jun 16 11:09:44 PDT 2005


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IGS Electronic Mail      16 Jun 11:06:54 PDT 2005      Message Number 5161
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Author: Pierre Uhrich  (forward by J. Ray)

Dear Colleague,

Observatoire de Paris (France) sufferred an electrical power failure 
shortly after 00:00 UTC on DOY 167 (MJD 53537, June 16). One of the 
unexpected consequences was the failure of both H-Masers of the 
laboratory, hence the one connected to our IGS station OPMT. This 
resulted in a loss of frequency reference for the Ashtech Z12-T receiver 
during a few hours. Moreover, the H-Maser restart this morning means a 
period of time which can reach a few days before the frequency of the 
H-Maser stabilizes again.

For many different reasons, it was decided today not to change the 
H-Maser source of the OPMT receiver. We will await the choice made by 
our Colleagues in charge of the Primary Frequency Standards among the 
H-Masers currently available to plan a change if necessary.

This message is intended to warn potential users that the RINEX file for 
DOY 167, which will be computed automatically tonight and released 
tomorrow morning (June 17), will be corrupted. This will also be the 
case for the future GPS P3 data transmitted to the BIPM.

Please feel free to forward this message to any Colleague you might feel 
interested.
Best regards.
P. Uhrich.

-- 
===============================================================
Dr Pierre Uhrich			Pierre.Uhrich at obspm.fr
Ingenieur LNE
Equipe Metrologie du temps
LNE-OP/SYRTE,			Phone:	+ 33 (0)1 40 51 22 17
UMR CNRS 8630,			Fax:	+ 33 (0)1 43 25 55 42
Observatoire de Paris,
61 avenue de l'Observatoire, F-75014 Paris, France.
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