[time-nuts] Correcting jitter on the 1 PPS signal from a GPS receiver.

Bob Camp kb8tq at n1k.org
Sat Sep 13 18:25:33 EDT 2014


Where are you getting the “15 ns accuracy” number from? When I look at the Trimble spec’s they have a number of errors described (like sawtooth) that are larger than 15 ns.


On Sep 13, 2014, at 10:41 AM, Peter Reilley <peter at reilley.com> wrote:

> I have 2 Trimble Resolution T receivers and I have compared the 1 PPS signal
> between the 2 units.   They are spec'ed at 15 nS accuracy.    I am seeing
> about
> 80 nS of jitter between the two.   This is with about 6 satellites in view.
> I was thinking about ways to improve this.   Since this is a stationary
> installation,
> can you use the jitter in the reported location (latitude and longitude) to
> correct
> for the 1 PPS jitter?
> The location data is derived using the internal GPS disciplined oscillator
> so both
> pieces of information should show the same jitter error.   If you compare
> the reported
> location with the known fixed location you should be able to use that error
> to correct
> for the 1 PPS error.
> Does this make sense or am I missing something?
> Pete.
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