[ntp:questions] National time standard differences
David J Taylor
david-taylor at blueyonder.delete-this-bit.and-this-part.co.uk.invalid
Thu Feb 11 21:25:34 UTC 2010
> The flying clock tests were closed loop (I think there's a more accurate
> term for the process) where the clock, including both its initial time
> error and its frequency offset (rate difference from USNO or NIST), was
> well characterized via radio and against a set of similar clocks prior
> to take-off. At the end of the trip, the clock was measured again. The
> time difference between departure and arrival was proportionally applied
> to the measurements taken along the way. e.g., if the clock was known
> to be 10ns/day fast during the trip, you adjust a measurement made on
> the 3rd day by 30ns. There were lots of additional statistics applied
> to improve the measurement results.
Thanks, John. Was the measurement down to the nanosecond level?
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