On 10/11/14, 8:08 AM, Bob Camp wrote:
Hi
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.
Bob
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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