On Jan 2, 2007, at 11:40, Warner Losh wrote:
> The second technical problem is that the length of a second is
> implicitly encoded in the carrier for many of the longwave time
> distribution stations. 10MHz is at SI seconds. For rubber seconds,
> the broadcast would drift into adjacent bands reserved for other
> things.
At 1000ns, the carrier would drift by 10Hz. Surely the bandwidth is
big enough for that?
> Also, GPS would have to remain in SI seconds. The error in GPS time
> translates directly to an error in position. Approximately 1m/ns of
> error (give of take a factor of 3). Rubber seconds would require that
> the rubber timescale be off by as much as .5s. So GPS has to remain
> in GPS time (UTC w/o leap seconds, basically). That means that the
> rubberness of the seconds would need to be broadcast in the
> datastream.
GPS is TAI. I'm not proposing abandoning TAI for those applications
that need it.
--
Ashley Yakeley
Received on Tue Jan 02 2007 - 11:57:02 PST