[time-nuts] GPS jump
kb8tq at n1k.org
Sat Oct 11 14:07:53 EDT 2014
The interesting thing about keeping ensembles of primary standards in line is that the boundary between “post processing” and “real time” blurs quite a bit. Looking at the papers, in many cases they are looking at all of what’s gone on over the last year or two and guessing at what will happen out to a few months from now.
On Oct 11, 2014, at 1:18 PM, Jim Lux <jimlux at earthlink.net> wrote:
> On 10/11/14, 8:08 AM, Bob Camp wrote:
>> To the extent that anything *is* locked, it’s been done for a lot longer than the 1980’s. Long before common view GPS, Loran-C observations (and corrections via clock trips) were used. You can look at it as a PLL, just a *very* fancy one with *very* long time constants.
> It also depends on whether you need "lock in real time" or "lock in post processing".
> VLBI is a good example of the latter, and was done in the early 70s to determine the position of the moon rover, for example.
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