[time-nuts] Trimble Thunderbolt no longer determines the correct date
paulswedb at gmail.com
Thu Jul 27 22:19:44 EDT 2017
Thanks I thought it would still work as the 3801 does.
On Thu, Jul 27, 2017 at 10:03 PM, Tom Van Baak <tvb at leapsecond.com> wrote:
> > There is: There is a 13bit week number in message type 10.
> Well, yes and no.
> Yes -- paragraph 220.127.116.11.1.1 in www.gps.gov/technical/icwg/IS-
> GPS-200D.pdf describes a 13-bit extended week number.
> No -- because this is part of the new CNAV format and existing GPS SV do
> not transmit that information.
> Interesting links and PDF's if you google: "Transmission Week Number" CNAV
> > The new 13-bit week number is only provided by the new "CNAV" data,
> > which in turn is (or will be) available only in newly added GPS signals.
> > Based on the carrier frequencies used, only the newest of the new
> > signals (L1C) will be available to common civilian receivers, even with
> > compatible hardware and firmware. This signal is unavailable from
> > satellites earlier than Block III, which are currently (July 2016) not
> > expected to begin to launch earlier than September 2016. Given that it
> > takes years to launch a full constellation of satellites, it's highly
> > unlikely that CNAV data with "operational" status will be available to
> > common civilian receivers in time for the April 2019 10-bit rollover.
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