[time-nuts] GPS Weekly Rollover Fail

[Michael Wouters]

BeiDou, Galileo and GLONASS all broadcast UTC time of day (or thereabouts
for GLONASS - it's offset by the timezone for Moscow) so any multi-GNSS
receiver has a sanity check on UTC calculated from GPS.

Michael

On Wed, 6 Feb 2019 at 11:03 am, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> From what I can see, you can send it a command that puts a new “oldest
> date”
> number into flash. Since it also tracks Glonass and Galileo, that will
> stretch out the
> time before you *need* to do something (like into the next century). They
> also have
> the “no dates before the firmware was issued” check.  There may be other
> date
> checks in there. Those are just what I’ve found so far.
>
> It also is likely that the “new” GPS sats will be flying within 19 years.
> That will add
> more bits to the GPS time fields. Who knows if the “modern” modules
> already handle
> those bits or not ….
>
> Bob
>
> > On Feb 5, 2019, at 5:23 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> >
> >
> > kb8tq at n1k.org said:
> >> The F9P has multiple cross checks, traps, and even a user configurable
> >> “oldest  possible date” entry.
> >
> > Neat/thanks.
> >
> > Is that stored in flash, or lost on power cycle?
> >
> > If it's in flash, I can "fix" things for another 20 years by extracting
> the
> > device from its box, taking it to a bench setup, running a flash-update
> > program, then reassembling things.  As ugly as that is, it may be
> simpler than
> > updating the firmware in the box.
> >
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
> >
> >
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