[time-nuts] Best GPS 1PPS Accuracy

Jason Rabel jason at extremeoverclocking.com
Wed Dec 13 12:39:12 EST 2006


One problem is that older GPS receiver spec sheets give numbers with SA on,
even though SA has been off for quite some time, so their numbers will be
inherently higher.

Probably the most accurate GPS receiver today would be the Motorola M12M
Timing. I would go into more detail but I'm about to head out the door. I'm
sure others will chime in on this soon.

There were some posts a few days ago about some new papers that were
published, there is some good info on the various recent versions of the
Motorola receivers... Might want to check that out.

Jason 

> Can someone explain the accuracy numbers that are represented in specs for
GPS
> receivers?

> I find that Trimble says the Resolution T
> (http://www.trimble.com/resolutiont.shtml) has 15 ns (1 Sigma) like the
M12+.

> So I guess the real question is; are you comparing apples to apples when
the
> standard deviation (Sigma) is specified?

> Another question is; what's the most accurate GPS receiver module
available? I
> realize this is only as accurate at the antenna system, but I'll save a
> multipath discussion for later.





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