[time-nuts] Fwd: CGSIC: Known Problem With Certain GPS Devices

Brooke Clarke brooke at pacific.net
Fri May 16 20:23:19 EDT 2014


Hi:

I recently got a CSI LGBX Pro DGPS Receiver and it used to display a list of the satellites it was tracking, but not 
that function is no longer working.
But all the other functions seem to work.  CSI made their own LF beacon receivers but in this model they use an Ashtech 
G-12L for GPS and a Fugro 3000
Receiver for the OmniSTAR correction subscription service which costs $800/year.  I've asked Trimble (who are doing the 
tech support for Ashtech) if there's a firmware upgrade.

http://www.prc68.com/I/LGBXcsiDGPS.html

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

Magnus Danielson wrote:
> They can't point official fingers. That's why.
>
> Ask you vendor if they need firmware upgrades to comply in this aspect.
>
> Cheers,
> Magnus
>
> On 05/16/2014 12:39 AM, SAIDJACK at aol.com wrote:
>> It would be good to understand which receivers are adversely  affected by
>> this.. the USCG did not list affected vendors/devices..
>>
>>
>> In a message dated 5/15/2014 15:19:51 Pacific Daylight Time,
>> magnus at rubidium.dyndns.org writes:
>>
>> Hi  fellow time-nuts,
>>
>> I think this message is interesting. It shows that  some receiver vendors
>> have been cheating on an important detail, ignoring  the health status
>> and being confused as a  result.
>>
>> Cheers,
>> Magnus
>>
>>
>> -------- Original Message  --------
>> Subject: CGSIC: Known Problem With Certain GPS Devices
>> Date:  Thu, 15 May 2014 21:20:23 +0000
>> From: Civil Global Positioning System  Service Interface Committee
>> (CGSIC)  <cgsic at cgls.uscg.mil>
>> Reply-To: cgsic at cgls.uscg.mil
>> To:  cgsic at cgls.uscg.mil <cgsic at cgls.uscg.mil>
>>
>> All CGSIC:
>>
>> May  15, 2014
>>
>> Recently, many GPS users have reported intermittent GPS  outages in their
>> devices.  After investigating, the U.S. government  has linked the
>> problem to flawed processing of GPS satellite data within certain GPS
>> receiver chipsets.  The GPS satellite service continues  to function as
>> designed and is fully operational and available  worldwide.
>>
>> The problem affects only user equipment that erroneously ignores the
>> satellite health status information broadcast from every GPS satellite.
>> The problem is not related to the April 28, 2014,  activation of civil
>> navigation messages on the GPS L2C and L5  signals.
>>
>> Since March 15, 2014, the Air Force has been conducting functional
>> checkout on a GPS satellite, designated Space Vehicle Number (SVN) 64.
>> SVN 64 broadcasts a data message that clearly indicates SVN 64 is
>> unusable for navigation.  Nevertheless, the U.S. government has
>> confirmed that certain GPS receivers are using data from SVN 64, in
>> violation of GPS interface specifications, resulting in outages or
>> corrupted, inaccurate position calculations.
>>
>> The Air Force testing  is scheduled to end in mid-May 2014 at which time
>> SVN 64 will begin normal  operation.  At that point, these problems may
>> stop  occurring.   Meanwhile, the U.S. government urges all GPS device
>> makers to review their products for compliance with the GPS interface
>> specifications, and if necessary, to issue software/firmware updates to
>> users as soon as possible. View specifications
>> http://www.gps.gov/technical/icwg/
>>
>> Users experiencing GPS outages  should check with their device
>> manufacturers for available  software/firmware updates.  In addition, any
>> civil user seeing  unusual behavior in GPS user equipment should report
>> it to the U.S. Coast  Guard Navigation Center (NAVCEN). Aviation users
>> should file reports  consistent with FAA-approved procedures. Military
>> users seeing  unusual behavior should report it the GPS Operations Center
>> (GPSOC).
>>
>> Please direct any civil user questions to NAVCEN at (703) 313-5900,
>> http://www.navcen.uscg.gov
>> Please direct any military user  questions to the GPSOC at (719)
>> 567-2541, DSN: 560-2541,  gpsoperationscenter at us.af.mil
>> https://gps.afspc.af.mil
>> Military  alternate: Joint Space Operations Center, (805) 606-3514, DSN:
>> 276-3514,  jspoccombatops at vandenberg.af.mil
>> ----
>> See also:
>> Technical explanation  for device makers (PDF)
>> http://www.navcen.uscg.gov/pdf/gps/GPSOC_PRN  30_Notice.pdf
>>
>> V/R
>> Rick Hamilton
>> CGSIC Executive  Secretariat
>> GPS Information Analysis Team Lead
>> USCG Navigation  Center
>> 703-313-5930
>>
>>
>> _______________________________________________
>> CGSIC  one-way mailing list
>> Unsubscribe:  http://cgls.uscg.mil/mailman/listinfo/cgsic
>>
>> If you would like to report  abuse of the CGLS listserv please send an
>> email to:  CGLSAdmin at uscg.mil
>>
>>
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