[time-nuts] GPS outage?

Sat Sep 7 12:11:59 UTC 2013

Hi

I'd say that:

HiNOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013053
SUBJ: SVN34 (PRN04) FORECAST OUTAGE SUMMARY JDAY 246/1717 - JDAY 247/0029
1.     NANU TYPE: FCSTSUMM
       NANU NUMBER: 2013053
       NANU DTG: 040030Z SEP 2013
       REFERENCE NANU: 2013052
       REF NANU DTG: 291526Z AUG 2013
       SVN: 34
       PRN: 04
       START JDAY: 246
       START TIME ZULU: 1717
       START CALENDAR DATE: 03 SEP 2013
       STOP JDAY: 247
       STOP TIME ZULU: 0029
       STOP CALENDAR DATE: 04 SEP 2013

2.  CONDITION: GPS SATELLITE SVN34 (PRN04) WAS UNUSABLE ON JDAY 246
    (03 SEP 2013) BEGINNING 1717 ZULU UNTIL JDAY 247 (04 SEP 2013)
    ENDING 0029 ZULU.

3.  POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
    MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
    COMM 719-567-2541, gpsoperationscenter at us.af.mil, HTTPS://GPS.AFSPC.AF.MIL
    MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
    COMM 805-606-3514, JSPOCCOMBATOPS at VANDENBERG.AF.MIL

is indeed trustworthy. 

It could / might cause issues world wide. A lot depends on how people write their firmware and how many sats are in view. Apparently it was not an issue to normal navigation firmware. The basic question being - did they write the firmware to take the "best 2 out of 3" if things looked odd. Given all the issues with multi path I would think they would.

Bob

On Sep 6, 2013, at 11:36 PM, "John C. Westmoreland, P.E." <john at westmorelandengineering.com> wrote:

> Fellow Time Nuts:
> 
> Is this a site to be trusted?:
> 
> http://adn.agi.com/SatelliteOutageCalendar/SOFCalendar.aspx
> 
> Regards,
> John W.
> 
> 
> On Fri, Sep 6, 2013 at 6:41 PM, John C. Westmoreland, P.E. <
> john at westmorelandengineering.com> wrote:
> 
>> Lisa,
>> 
>> Thanks for this update.  How many Resolution-T receivers are out there?
>> 
>> Not to go off on another tangent - but I have heard something about 'GPS
>> jamming during the America's Cup'.  Hmmm.
>> 
>> Regards,
>> John Westmoreland
>> 
>> 
>> 
>> On Fri, Sep 6, 2013 at 8:54 AM, Lisa Perdue <perdue.lisa at gmail.com> wrote:
>> 
>>> Trimble has confirmed to us that the nonstandard outage on PRN 4 (SVN 34)
>>> may have caused the Resolution-T receivers to perform a reset and then
>>> return to normal operation. They are investigating the cause but it does
>>> explain why only some people experienced the event. Other Trimble
>>> receivers
>>> and other manufacturers seem unaffected.
>>> 
>>> 
>>> On Thu, Sep 5, 2013 at 10:34 PM, Brian, WA1ZMS <wa1zms at att.net> wrote:
>>> 
>>>> Guys-
>>>> 
>>>> Please forgive me for the BW......
>>>> 
>>>> My day-job mgmt. has also asked me today if I knew of any US regional
>>> GPS
>>>> "issues", as we too have had several reports of
>>>> our customers systems going into Rb hold-over on or about the 4th of
>>> Sept.
>>>> Only fact I can find is that SVN 4 was noted as
>>>> an issue via:
>>> http://adn.agi.com/SatelliteOutageCalendar/SOFCalendar.aspx
>>>> But that can't be the root cause.
>>>> 
>>>> At work, I am now the "go-to-guy" for ANYTHING GPS related since I'm a
>>>> Time-Nut and we have customers who depend on
>>>> GPS timing for their  comm. systems;  and for reasons I cannot go into
>>> here
>>>> on this reflector.
>>>> 
>>>> So like Brad.....I too have anecdotal reports of issues.  The sky is not
>>>> falling, nor was it a serious issue.
>>>> However if anyone has info that they cannot share via the reflector, a
>>>> private reply would be much appreciated.
>>>> I am not looking for info that cannot be openly shared. But if anyone
>>> has
>>>> hint or clue, I would much appreciate it.
>>>> 
>>>> BTW....my GPS receivers here in VA seemed to have had no issue. Go
>>> figure.
>>>> 
>>>> -Brian, WA1ZMS
>>>> 
>>>> 
>>>> 
>>>> -----Original Message-----
>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>>>> Behalf Of Brad Dye
>>>> Sent: Wednesday, September 04, 2013 6:14 PM
>>>> To: Time Nuts
>>>> Subject: [time-nuts] GPS outage?
>>>> 
>>>> Readers of my newsletter are reporting a strange interruption of their
>>> GPS
>>>> reception yesterday -- mainly in the northeastern US but also in SC.
>>> This
>>>> is
>>>> my first day on this mailing list -- for a while -- so I don't know if
>>> this
>>>> has been discussed or reported previously. Has anyone else noticed
>>> this? We
>>>> are trying to find out is there was some sort of system-wide issue or
>>> maybe
>>>> if it was local interference possibly caused by those GPS jammers that
>>> some
>>>> of the truckers have been using.
>>>> 
>>>> By the way, my newsletter is mostly about Paging, and we use GPS/DOs to
>>>> keep
>>>> the paging transmitters (in simulcast mode) synchronized and on
>>> frequency.
>>>> 
>>>> Best regards,
>>>> 
>>>> Brad Dye, K9IQY
>>>> Editor, Wireless Messaging News
>>>> P.O. Box 266
>>>> Fairfield, IL  62837 USA
>>>> Telephone: 618-599-7869
>>>> Skype: braddye
>>>> http://www.braddye.com
>>>> 
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>> 
>> 
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