Subject: [IGSSTATION-2975]: Re: NIST primary receiver
From: "Jim.Ray" <[email-masked]>
To: Marc Weiss <[email-masked]>
Cc: IGSStation <[email-masked]>, Victor Zhang <[email-masked]>, [email-masked]
Date: Tue, 07 Apr 2009 15:28:47 -0400

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IGS Station Mail          07 Apr 12:29:08 PDT 2009      Message Number 2975
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Author: Jim Ray

To amplify on Marc's message, the level of cycle slips for
NISU is more than an order of magnitude greater than for
NIST -- see plots at:

http://igscb.jpl.nasa.gov/network/site/nisu.html
http://igscb.jpl.nasa.gov/network/site/nist.html

In fact, the NISU cycle slips are high enough to suggest
some problem with the hardware there (or snow covering the
antenna).  Both MP1 and MP2 are on the high side too.

I would suggest to plan to decommission this site in the
near future.

On the down side, though, the data delivery latencies for
both stations are excessive (for the past ~40 d) and really
should be reduced (assuming the IGS CB plots are correct).

Also, both are registered with M type ("marker") DOMES
numbers whereas they both use the antenna ARPs as physical
reference points.  It is too late to correct this now, but
please request S type ("system") DOMES numbers for such
points in the future.

Marc Weiss wrote:
> ****************************************************************************** 
> 
> IGS Station Mail          07 Apr 12:08:43 PDT 2009      Message Number 2974
> ****************************************************************************** 
> 
> 
> Author: Marc Weiss
> Subject: NIST primary receiver
> 
> Dear Colleagues,
> 
> The station named NIST is a newer station in the IGS that is intended to 
> be the primary station of NIST in Boulder.  This uses newer (and 
> apparently better) equipment than our older station NISU.  Several 
> analysis centers are still using the data from NISU instead of those 
> from NIST.  Please consider using the data from NIST.
> 
> Best Regards,
> Marc Weiss
> 
> 
> 
> ____________________________________________________________________
> Marc A. Weiss, Ph.D.                                    Phone:  
> 303/497-3261
> NIST Time and Frequency Division                FAX:     303/497-6461
> MS 847.5, 325 Broadway
> Boulder, CO  80305-3328
> ____________________________________________________________________