[time-nuts] Warped back to 1993

bg bg at lysator.liu.se
Sun Aug 11 06:15:13 EDT 2013


As has been discussed here before.

The GPS firmware programmer finalizing his stuff at GPS week X (approaching 1024) will make sure his receiver will survive until X weeks into the next era. What X is is hard for the end user to know. 1024 weeks is long time beyond normal warranties. 

I have seen era predictions based on # of leap seconds. But that particular implementation did not fare well with long leapsecondless periods we had.

/Björn



Skickat från min Mobil 

-------- Originalmeddelande --------
Från: "Mark C. Stephens" <marks at non-stop.com.au> 
Datum: 2013-08-11  11:04  (GMT+01:00) 
Till: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Rubrik: Re: [time-nuts] Warped back to 1993 
 
Yep Sorry, I see what you mean, can't be the GPS week rollover bug then.
I am at a loss to explain this one then.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Mark C. Stephens
Sent: Sunday, 11 August 2013 6:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Warped back to 1993

Please explain what happened today then?
Also, the 2 module that I cannot set to the correct date are both Furino GT-77's.
Over on the NTP list they are claiming it's the start of the new GPS 1024 week epoch.
If you have a look at the rest of the days here: http://adn.agi.com/GNSSWeb/ Today was special.



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Azelio Boriani
Sent: Sunday, 11 August 2013 6:17 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Warped back to 1993

Yes. This week is not the start of a new epoch.

On Sun, Aug 11, 2013 at 10:10 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> marks at non-stop.com.au said:
>> Today is start of new epoch.
>> As per: http://adn.agi.com/GNSSWeb/
>> 1753:0  Full GPS week since 1st epoch : day of week number
>> 729:0         GPS Week since latest epoch : seconds of week at midnight for that day
>
> I don't think so.  If this was a new epoch, that 729 would be 0 and 
> the 1753 would be 2048.
>
> The 0s above are the day of week and seconds of week, nothing to do 
> with the epoch.
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
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