[IGSSTATION-4686] Fwd: Re: spurious navigation messages for PRN24/SVN24

[Jake Griffiths]

FYI

-------- Original Message --------
Subject: 	Re: [IGSSTATION-4679] spurious navigation messages for PRN24/SVN24
Date: 	Wed, 30 Nov 2011 15:18:57 +0100
From: 	justin.walford at leica-geosystems.com
To: 	Jake.Griffiths at noaa.gov



Dear Jake

Thank you for bringing this to our attention. I would recommend the following
for the Leica GRX1200 receivers.

For the Leica GRX1200GG Pro:
This is a known issue that was fixed in version 7.81 of the SmartWorx firmware.
For all receivers not running
the latest firmware please upgrade to 8.20/3.019. Following the upgrade of the
firmware please also Initialise
the Ephemeris/Almanac in the configuration>tracking page, and reboot the receiver.

For Leica GRX1200GG Pro running firmware 8.20 please also Initialise the
Ephemeris/Almanac in the configuration>tracking page,
and reboot the receiver.

For Leica GRX1200+GNSS please also Initialise the Ephemeris/Almanac in the
configuration>tracking page, and reboot the receiver.

Kind Regards / Schönen Gruss
Justin

Justin Walford
Senior Product Manager Hardware
GNSS Networks and Reference Stations
Leica Geosystems AG, Heinrich-Wild-Strasse
CH-9435 Heerbrugg, Switzerland
Phone: +41 71 727 4329
E-Mail: _justin.walford at leica-geosystems.com_
<mailto:david.dixon at leica-geosystems.com>
Website: _http://www.leica-geosystems.com_ <http://www.leica-geosystems.com/>
_
_- when it has to be right, Leica Geosystems






From: Jake Griffiths <Jake.Griffiths at noaa.gov>
To: igsstation at igscb.jpl.nasa.gov
Date: 29/11/2011 20:54
Subject: [IGSSTATION-4679] spurious navigation messages for PRN24/SVN24
Sent by: igsstation-bounces at igscb.jpl.nasa.gov
--------------------------------------------------------------------------------



Author: Jake Griffiths

Dear Colleagues,

The daily broadcast navigation (brdc) file at NASA/CDDIS is created by
concatenating nav records collected at a set of global (IGS and non-IGS)
tracking stations. The Analysis Coordinator (ACC) uses the brdc file for
various aspects of the orbit combinations. On three days in the past week,
spurious PRN24/SVN24 records have caused ACC processes to fail. The most recent
event happened today for yesterday's observations (i.e., brdc3320.11n).

Recall that PRN24/SVN24 was set unusable and stopped transmitting on September
30, 2011. It was then decommissioned on Nov 4, 2011.

A search of the IGS station-specific nav files at CDDIS for year=2011 and
doy=332 uncovered the following IGS stations (and receivers) reporting obs for
PRN24/SVN24:

SITE RECEIVER TYPE FIRMWARE VERSION
---------------------------------------------
ankr TPS E_GGD 2.6.1 Jan,10,2008
badg JAVAD TRE_G3TH DELTA 3.2.7 May,16,2011
bzrg LEICA GRX1200GGPRO 7.80/3.019
conz LEICA GRX1200+GNSS 8.20/4.007
darw LEICA GRX1200GGPRO 8.20/3.019
dlft JPS LEGACY 2.6.1 Jan,10,2008
hers SEPT POLARX3ETR 2.1
hofn TPS E_GGD 2.6.1 JAN,10,2008
hueg JPS LEGACY 2.6.1 JAN,10,2008
joz2 LEICA GRX1200GGPRO 8.20/3.019
joze TRIMBLE 4000SSI 7.29
mac1 LEICA GRX1200+GNSS 8.10
mad2 ASHTECH Z-XII3T 1L01-1D04
maw1 LEICA GRX1200GGPRO 8.01/3.019
nano LEICA GRX1200GGPRO 7.80/3.019
rcmn LEICA GRX1200GGPRO GSW
sass JPS LEGACY 2.6.1 JAN,10,2008
str1 LEICA GRX1200GGPRO 8.20/3.019
titz JPS LEGACY 2.6.1 JAN,10,2008
tow2 LEICA GRX1200GGPRO 8.20/3.019
wroc LEICA GRX1200GGPRO 8.20/3.019
yar3 LEICA GRX1200GGPRO 8.20/3.019

While there are common threads in this list, it is unclear to me what may be
causing the spurious records. If you operate a station with one of these
receivers, perhaps refreshing the almanac would eliminate the problem.
Otherwise, there may be firmware updates that could help. Unfortunately, I have
no other ideas. But any progress on solving these issues would be helpful to the
ACC.

Thanks for your time.

Best regards,

jake
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