[time-nuts] Some GPS performance plots
John R. Ackermann N8UR
jra at febo.com
Wed Nov 3 10:24:37 EST 2004
Poul-Henning Kamp wrote:
> In message <4188F665.5090502 at febo.com>, "John R. Ackermann N8UR" writes:
>>Nothing sexy here, but in response to some serious confusion on the NTP
>>mailing list, I put together some plots of the 1pps output from a
>>Motorola M12+ Timing Oncore versus an Rb standard. It may be helpful if
>>you want to point people to info about GPS timing capabilities.
> You're not being fair to the M12+ here. You should correct the timestamp with the
> "negative sawtooth correction" field from the serial data stream.
I know, and I should (and will) note to that on the page. Since I'm
capturing the 1pps output from the receiver and feeding it into a
counter, I can't apply the sawtooth correction value the way I could if
I were processing the data in a PC.
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