Yes, but you have to do this every 19.2 years and pretty soon it becomes a
chore...
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: Azelio Boriani <azelio.bori...@screen.it>
Sender: time-nuts-boun...@febo.com
Date: Fri, 8 Jun 2012 09:26:12
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] Thunderbolt GPS rollover
I think the only solution is to put the correction value in by hand.
On Fri, Jun 8, 2012 at 3:45 AM, k4...@aol.com <k4...@aol.com> wrote:
> Mike,
> The problem with your solution is that the receiver can get an error in
> calculating the year value and if it writes a number greater than it
> actually is into eeprom, the next time it powers on it will be forced to go
> forward 19 years in time. And since it is not allowed to go backwards in
> time, it will always have the wrong date. I have worked with many software
> engineers doing GPS receiver design, believe me, there is no fool proof
> solution to this.
> Doug, K4CLE
>
> Connected by DROID on Verizon Wireless
>
>
> -----Original message-----
> From: Mike S <mi...@flatsurface.com>
> To: time-nuts@febo.com
> Sent: Fri, Jun 8, 2012 00:51:21 GMT+00:00
> Subject: Re: [time-nuts] Thunderbolt GPS rollover
>
> On 6/7/2012 8:02 PM, Bob Camp wrote:
>
>> One could put in a routine that looks at the date the software was
>> written and "fix" any date that shows up as being in the past.
>>
>
> After all the issues seen after the last rollover, I'd think
> receiverswould have been made robust against this.
>
> One obvious method would be to keep a checkpoint date (or 1024 weekcycle #
> + week offset) in EEPROM. To avoid issues with using up EEPROMr/w cycles,
> only update it anytime the currently received date is morethan a year
> beyond the currently stored date.
>
>
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